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S i 8 2 2 0/21
0 . 5 A N D 2 . 5 AMP I S O D R I VE R S W I T H O P T O I N P U T ( 2 . 5 , 3 . 7 5 , A N D 5 . 0 KV R M S )
Features

Functional upgrade for HCPL-0302, HCPL-3120, TLP350, and similar opto-drivers 50 ns propagation delay (independent of input drive current) 14x tighter part-to-part matching versus opto-drivers 2.5, 3.75, and 5.0 kVRMS isolation
Transient Immunity 30 kV/s
Under-voltage lockout protection with hysteresis Resistant to temperature and aging effects Gate driver supply voltage: 6.5 V to 24 V Operating temperature range: -40 to +125 C Cost-effective Narrow body SOIC-8 and Wide body SOIC-16 packages RoHS Compliant
Pin Assignments: See page 19
Narrow Body SOIC NC 8 VDD 1 ANODE 2 7 VO CATHODE 6 VO 3 NC 4 5 VSS
Top View
Wide Body SOIC
CATHODE NC
Applications
IGBT/ MOSFET gate drives Industrial control systems Switch mode power supplies
UPS systems Motor control drives Inverters
NC ANODE NC NC CATHODE
Safety Regulatory Approvals

UL 1577 recognized Up to 5000 VRMS for 1 minute CSA component notice 5A approval IEC 60950, 61010, 60601 approved
VDE certification conformity IEC 60747-5-2 (VDE0884 Part 2)
NC
1 2 3 4 5 6 7 8
Top View
16 15 14 13 12 11 10 9
VSS VDD NC VO NC NC NC VSS
Patent pending
Description
The SI8220/21 is a high-performance, functional upgrade for optocoupled drivers, such as the HCPL-3120 and the HPCL-0302 providing 2.5 A of peak output current. It utilizes Silicon Laboratories' proprietary silicon isolation technology, which provides a choice of 2.5, 3.75, or 5.0 kVRMS withstand voltages per UL1577. This technology enables higher performance, reduced variation with temperature and age, tighter part-topart matching, and superior common-mode rejection compared to optoisolated drivers. While the input circuit mimics the characteristics of an LED, less drive current is required, resulting in increased efficiency. Propagation delay time is independent of input drive current, resulting in consistently short propagation time, tighter unit-to-unit variation, and greater input circuit design flexibility.
Rev. 0.22 4/10
Copyright (c) 2010 by Silicon Laboratories
SI8220/21
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
SI8220/21
Functional Block Diagram
NC
ISOLATOR Semiconductor-Based Isolation Barrier
LED Emulator
VDD
ANODE
RF Transmitter
VO
RF Receiver UV Lockout
CATHODE
VO
VSS NC
SI8220/21
2
Rev. 0.22
SI8220/21 TABLE O F CONTENTS
Section Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. Test Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 3. Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 4. Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.1. Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5. Technical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 5.1. Device Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 5.2. Device Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 5.3. Under Voltage Lockout (UVLO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.1. Power Supply Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.2. Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.3. Power Dissipation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 6.4. Input Circuit Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6.5. Parametric Differences between SI8220/21 and HCPL-0302 and HCPL-3120 Opto Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 6.6. RF Radiated Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.7. RF, Magnetic, and Common Mode Transient Immunity . . . . . . . . . . . . . . . . . . . . . . 18 7. Pin Descriptions (Narrow-Body SOIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8. Pin Descriptions (Wide-Body SOIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 10. Package Outline: 8-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 11. Land Pattern: 8-Pin Narrow Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 12. Package Outline: 16-Pin Wide Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 13. Land Pattern: 16-Pin Wide-Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Rev. 0.22
3
SI8220/21
1. Electrical Specifications
Table 1. Electrical Characteristics 1
VDD = 12 V or 15 V, VSS = GND, TA = -40 to +125 C; typical specs at 25 C.
Parameter DC Specifications Power supply voltage Input current (ON) Input current rising edge hysteresis Input voltage (OFF)
Symbol
Test Conditions
Min
Typ
Max
Units
VDD IF(ON) IHYS VF(OFF)
(VDD - VSS)
6.5 5.0 --
-- -- 1.0 --
24 20 -- 1.6
V mA mA V
Measured at ANODE with respect to CATHODE. Measured at ANODE with respect to CATHODE. IF = 5 mA. 0.5 A devices
-0.6
Input forward voltage
VF
1.7 -- -- -- -- -- -- -- -- --
-- 15 2.7 5.0 1.0 0.3 1.5 0.5 2.5 VDD-0.5 VDD-0.1
2.5 -- -- -- -- --
V
Output resistance high (source)
ROH
2.5 A devices 0.5 A devices
Output resistance low (sink)
ROL
2.5 A devices (0.5 A), IF = 0 (see Figure 2)
Output high current (source)
IOH
A (2.5 A), IF = 0 (see Figure 2) (0.5 A), IF = 10 mA, (see Figure 1) -- -- A (2.5 A), IF = 10 mA, (see Figure 1) (0.5 A), I OUT = -50 mA (2.5 A), I OUT = -50 mA (0.5 A), I OUT = 50 mA (2.5 A), I OUT = 50 mA Output open IF = 10 mA Output open VF = -0.6 to +1.6 V -- -- -- -- -- V -- mV 50 1.2 1.4 -- -- mA mA
Output low current (sink)
IOL
High-level output voltage
VOH
200
Low-level output voltage High level supply current Low level supply current
VOL
Input reverse voltage Input capacitance
BVR CIN
IR = 10 mA. Measured at ANODE with respect to CATHODE.
0.5 --
-- 5
-- --
V pF
Notes: 1. VDD = 12 V for 5, 8, and 10 V UVLO devices; VDD = 15 V for 12.5 V UVLO devices. 2. See "9.Ordering Guide" on page 21 for more information.
4
Rev. 0.22
SI8220/21
Table 1. Electrical Characteristics (Continued)1
VDD = 12 V or 15 V, VSS = GND, TA = -40 to +125 C; typical specs at 25 C.
Parameter VDD Undervoltage Threshold2 5 V threshold 8 V threshold 10 V threshold 12.5 V threshold VDD Undervoltage Threshold2 5 V threshold 8 V threshold 10 V threshold 12.5 V threshold VDD Lockout hysteresis VDD Lockout hysteresis VDD Lockout hysteresis AC Specifications Propagation delay time to high output level Propagation delay time to low output level UVLO turn-off delay Output rise and fall time
Symbol VDDUV+
Test Conditions VDD rising See Figure 8 on page 13. See Figure 9 on page 13. See Figure 10 on page 13. See Figure 11 on page 13.
Min
Typ
Max
Units
5.20 7.50 9.60 12.4
5.80 8.60 11.1 13.8
6.30 9.40 12.2 14.8
V V V
VDDUV-
VDD falling See Figure 8 on page 13. See Figure 9 on page 13. See Figure 10 on page 13. See Figure 11 on page 13.
4.90 7.20 9.40 11.6 -- -- -- 5.52 8.10 10.1 12.8 280 600 1000 6.0 8.70 10.9 13.8 -- -- -- mV mV mV
V V V
VDDHYS VDDHYS VDDHYS
UVLO voltage = 5 V UVLO voltage = 8 V UVLO voltage = 10 V or 12.5 V
tPLH tPHL tUVLO OFF tR, tF tSTART
CMTI
CL = 200 pF CL = 200 pF
-- -- --
-- -- -- -- -- --
50
50 30 50 30
ns ns ns ns
(0.5 A), CL = 200 pF (2.5 A), CL = 200 pF Time from VDD = VDD_UV+ to VO
Input ON or OFF
-- -- --
30
20 40
--
Device start-up time
Common Mode Transient Immunity
s
kV/s
Notes: 1. VDD = 12 V for 5, 8, and 10 V UVLO devices; VDD = 15 V for 12.5 V UVLO devices. 2. See "9.Ordering Guide" on page 21 for more information.
Rev. 0.22
5
SI8220/21
2. Test Circuits
VDD = 15 V
VDD IN_ Si822x OUT_ SCHOTTKY VSS 1 F 100 F 5V 10
+ _
INPUT
1 F CER 10 F EL RSNS 0.1
Measure 50 ns
IF GND
200 ns
INPUT WAVEFORM
Figure 1. IOL Sink Current Test Circuit
VDD = 15 V
VDD IN_ Si823x OUT_ SCHOTTKY VSS 1 F 100 F 5V 10
+ _
INPUT
Measure 50 ns 1 F CER 10 F EL RSNS 0.1
IF GND
200 ns
INPUT WAVEFORM
Figure 2. IOH Source Current Test Circuit
6
Rev. 0.22
SI8220/21
3. Regulatory Information
Table 2. Regulatory Information*
CSA The Si82xx is certified under CSA Component Acceptance Notice 5A. For more details, see File 232873. VDE The Si82xx is certified according to IEC 60747-5-2. For more details, see File 5006301-4880-0001. UL The Si82xx is certified under UL1577 component recognition program. For more details, see File E257455.
*Note: Regulatory Certifications apply to 2.5 kVRMS rated devices which are production tested to 3.0 kVRMS for 1 sec. Regulatory Certifications apply to 3.75 kVRMS rated devices which are production tested to 4.5 kVRMS for 1 sec. Regulatory Certifications apply to 5.0 kVRMS rated devices which are production tested to 6.0 kVRMS for 1 sec. For more information, see "9.Ordering Guide" on page 21.
Table 3. Insulation and Safety-Related Specifications
Value Parameter Nominal Air Gap (Clearance)1 Nominal External Tracking (Creepage)1 Minimum Internal Gap (Internal Clearance) Tracking Resistance (Comparative Tracking Index) Resistance (Input-Output)2 Capacitance (Input-Output)2 Input Capacitance3 CTI RIO CIO CI f = 1 MHz DIN IEC 60112/VDE 0303 Part 1 Symbol L(IO1) L(IO2) Test Condition WB SOIC-16 8.0 min 8.0 min 0.014 >175 1012 2.0 4.0 NB SOIC-8 4.9 min 4.01 min 0.014 >175 1012 1.0 4.0 Unit mm mm mm V pF pF
Notes: 1. The values in this table correspond to the nominal creepage and clearance values as detailed in "12.Package Outline: 16-Pin Wide Body SOIC" on page 25, "10.Package Outline: 8-Pin Narrow Body SOIC" on page 23. VDE certifies the clearance and creepage limits as 8.5 mm minimum for the WB SOIC-16 package and 4.7 mm minimum for the NB SOIC-8 package. UL does not impose a clearance and creepage minimum for component level certifications. CSA certifies the clearance and creepage limits as 3.9 mm minimum for the NB SOIC-8 and 7.6 mm minimum for the WB SOIC-16 package. 2. To determine resistance and capacitance, the Si82xx is converted into a 2-terminal device. Pins 1-8 (1-4, NB SOIC-8) are shorted together to form the first terminal and pins 9-16 (5-8, NB SOIC-8) are shorted together to form the second terminal. The parameters are then measured between these two terminals. 3. Measured from input pin to ground.
Rev. 0.22
7
SI8220/21
Table 4. IEC 60664-1 (VDE 0844 Part 2) Ratings
Parameter Test Conditions Specification NB SOIC8 Basic isolation group Material Group Rated Mains Voltages < 150 VRMS Installation Classification Rated Mains Voltages < 300 VRMS Rated Mains Voltages < 400 VRMS Rated Mains Voltages < 600 VRMS IIIa I-IV I-III I-II I-II WB SOIC 16 IIIa I-IV I-IV I-III I-III
Table 5. IEC 60747-5-2 Insulation Characteristics for Si82xxxC*
Characteristic Parameter Maximum Working Insulation Voltage Symbol Test Condition WB SOIC-16 891 Method a After Environmental Tests Subgroup 1 (VIORM x 1.6 = VPR, tm = 60 sec, Partial Discharge < 5 pC) Input to Output Test Voltage VPR Method b1 (VIORM x 1.875 = VPR, 100% Production Test, tm = 1 sec, Partial Discharge < 5 pC) After Input and/or Safety Test Subgroup 2/3 (VIORM x 1.2 = VPR, tm = 60 sec, Partial Discharge < 5 pC) Highest Allowable Overvoltage (Transient Overvoltage, tTR = 10 sec) Pollution Degree (DIN VDE 0110, Table 1) Insulation Resistance at TS, VIO = 500 V RS VTR NB SOIC-8 560 Unit
VIORM
V peak
1590
896
1375
1050
V peak
1018
672
6000 2 >109
4000 2 >109
V peak
*Note: This isolator is suitable for basic electrical isolation only within the safety limit data. Maintenance of the safety data is ensured by protective circuits. The Si82xx provides a climate classification of 40/125/21.
8
Rev. 0.22
SI8220/21
Table 6. IEC Safety Limiting Values1
Max Parameter Case Temperature Safety input, output, or supply current Device Power Dissipation2 Symbol TS IS JA = 140 C/W (NB SOIC-8), 100 C (WB SOIC-16), VI = 5.5 V, TJ = 150 C, TA = 25 C Test Condition Min Typ -- -- -- -- WB SOIC-16 150 50 NB SOIC-8 150 40 Unit C mA
PD
--
--
1.2
1.2
W
Notes: 1. Maximum value allowed in the event of a failure; also see the thermal derating curve in Figure 4. 2. The Si822x is tested with VO = 24 V, TJ = 150 C, CL = 200 pF, input a 2 MHz 50% duty cycle square wave.
Table 7. Thermal Characteristics
Parameter IC Junction-to-Air Thermal Resistance Symbol JA Min -- Typ WB SOIC-16 100 NB SOIC-8 140 Max -- Unit C/W
Safety-Limiting Current (mA)
60 50 40 30 20 10 0 0 50 100 150 Case Temperature (C) 200
VDDI = 5.5 V VDDA, VDDB = 24 V
Figure 3. (WB SOIC-16) Thermal Derating Curve, Dependence of Safety Limiting Values with Case Temperature per DIN EN 60747-5-2
Rev. 0.22
9
SI8220/21
Safety-Limiting Current (mA) 60 50 40 30 20 10 0 0 50 100 150 Case Temperature (C) 200
VDDI = 5.5 V VDDA, VDDB = 24 V
Figure 4. (NB SOIC-8) Thermal Derating Curve, Dependence of Safety Limiting Values with Case Temperature per DIN EN 60747-5-2 Table 8. Absolute Maximum Ratings1
Parameter Storage temperature2 Operating temperature Output supply voltage Output voltage Output current drive Input current Lead solder temperature (10 s) Maximum Isolation Voltage (1 s) NB SOIC-8 Maximum Isolation Voltage (1 s) WB SOIC-16 VDD VO IO IF(AVG) Conditions TSTG Min -65 -40 -0.6 -0.5 -- -100 -- -- -- Typ -- -- -- -- -- -- -- -- -- Max +150 +125 30 VDD + 0.5 10 30 260 4250 6500 Units C C V V mA V C VRMS VRMS
Notes: 1. Permanent device damage may occur if the absolute maximum ratings are exceeded. Functional operation should be restricted to the conditions specified in the operational sections of this data sheet. 2. VDE certifies storage temperature from -40 to 150 C.
10
Rev. 0.22
SI8220/21
4. Application Information
4.1. Theory of Operation
The SI8220/21 is a functional upgrade for popular opto-isolated drivers, such as the Avago HPCL-3120, HPCL0302, Toshiba TLP350, and others. The operation of an SI8220/21 channel is analogous to that of an opto coupler, except an RF carrier is modulated instead of light. This simple architecture provides a robust isolated data path and requires no special considerations or initialization at start-up. A simplified block diagram for the SI8220/21 is shown in Figure 5.
Transmitter
RF OSCILLATOR
Receiver VDD
MODULATOR
LED Emulator
A
SemiconductorBased Isolation Barrier
DEMODULATOR
0.5 to 2.5 A peak
B
Gnd
Figure 5. Simplified Channel Diagram
A channel consists of an RF Transmitter and RF Receiver separated by a semiconductor-based isolation barrier. Referring to the Transmitter, input A modulates the carrier provided by an RF oscillator using on/off keying. The Receiver contains a demodulator that decodes the input state according to its RF energy content and applies the result to output B via the output driver. This RF on/off keying scheme is superior to pulse code schemes as it provides best-in-class noise immunity, low power consumption, and better immunity to magnetic fields. See Figure 6 for more details.
Input Signal
Modulation Signal
Output Signal
Figure 6. Modulation Scheme
Rev. 0.22
11
SI8220/21
5. Technical Description
5.1. Device Behavior
Truth tables for the SI8220/21 are summarized in Table 9.
Table 9. SI8220/21 Truth Table Summary
Cathode X Hi-Z X GND VF GND1 GND1 Anode X X Hi-Z GND VF VF VF Diode Current (IF) X 0 0 0 0 < IF(OFF > IF(OFF) VDD < UVLO > UVLO > UVLO > UVLO > UVLO > UVLO > UVLO VO L L L L L L H Comments Device turned off Logic low state Logic low state Logic low state Logic low state Logic low state Logic high state
Note: "X" = don't care.
5.2. Device Startup
Output VO is held low during power-up until VDD rises above the UVLO+ threshold for a minimum time period of tSTART. Following this, the output is high when the current flowing from anode to cathode is > IF(ON). Device startup, normal operation, and shutdown behavior is shown in Figure 7.
UVLO+ UVLO-
VDDHYS
VDD
IF(ON) IF
tSTART
tPHL
tPLH
tSTART
VO
Figure 7. SI8220/21 Operating Behavior (IF > IF(MIN) when VF > VF(MIN))
12
Rev. 0.22
SI8220/21
5.3. Under Voltage Lockout (UVLO)
The UVLO circuit unconditionally drives VO low when VDD is below the lockout threshold. Referring to Figures 8 through 11, upon power up, the SI8220/21 is maintained in UVLO until VDD rises above VDDUV+. During power down, the SI8220/21 enters UVLO when VDD falls below the UVLO threshold plus hysteresis (i.e., VDD < VDDUV+ - VDDHYS).
V DDUV+ (Typ)
V DDUV+ (Typ)
Output Voltage (VO) 10.5
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
Output Voltage (VO) 10.5
8.5 9.0
9.5
10.0 10.5 11.0 11.5 12.0 12.5
Supply Voltage (V DD - V SS) (V)
Supply Voltage (V DD - V SS) (V)
Figure 8. SI8220/21 UVLO Response (5 V)
V DDUV+ (Typ)
Figure 10. SI8220/21 UVLO Response (10 V)
V DDUV+ (Typ)
Output Voltage (VO) 10.5
Output Voltage (VO) 10.5
11.3 11.8
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5 10.0
12.3 12.8 13.3 13.8 14.3 14.8 15.3
Supply Voltage (V DD - V SS) (V)
Supply Voltage (V DD - V SS) (V)
Figure 9. SI8220/21 UVLO Response (8 V)
Figure 11. SI8220/21 UVLO Response (12.5 V)
Rev. 0.22
13
SI8220/21
6. Applications
6.1. Power Supply Connections
VSS can be biased at, above, or below ground as long as the voltage on VDD with respect to VSS is a maximum of 24 V. VDD decoupling capacitors should be placed as close to the package pins as possible. The optimum values for these capacitors depend on load current and the distance between the chip and its power source. It is recommended that 0.1 and 10 F bypass capacitors be used to reduce high-frequency noise and maximize performance.
6.2. Layout Considerations
It is most important to minimize ringing in the drive path and noise on the VDD lines. Care must be taken to minimize parasitic inductance in these paths by locating the SI8220/21 as close to the device it is driving as possible. In addition, the VDD supply and ground trace paths must be kept short. For this reason, the use of power and ground planes is highly recommended. A split ground plane system having separate ground and VDD planes for power devices and small signal components provides the best overall noise performance.
6.3. Power Dissipation Considerations
Proper system design must assure that the SI8220/21 operates within safe thermal limits across the entire load range. The SI8220/21 total power dissipation is the sum of the power dissipated by bias supply current, internal switching losses, and power delivered to the load, as shown in Equation 1.
P D = V F I F + V DD I QOUT + C int V DD F + 2 C L V DD F where: P D is the total SI8220 device power dissipation (W) I F is the diode current (10 mA max) V F is the diode anode voltage (2.8 V max) I QOUT is the driver maximum bias curent (5 mA) C int is the internal parasitic capacitance (370 pF) V DD is the driver-side supply voltage (24 V max) F is the switching frequency (Hz)
2 2
Equation 1. The maximum allowable power dissipation for the SI8220/21 is a function of the package thermal resistance, ambient temperature, and maximum allowable junction temperature, as shown in Equation 2.
T jmax - T A P D MAX -------------------------- ja where: P D MAX is the maximum allowable SI8220/21 power dissipation (W) T jmax is the SI8220/21 maximum junction temperature (145 C) T A is the ambient temperature (C) ja is the SI8220/21 package junction-to-air thermal resistance (125 C/W)
Equation 2. Substituting values for PD(MAX), Tjmax, TA, and ja into Equation 2 results in a maximum allowable total power dissipation of 0.95 W. The maximum allowable load is found by substituting this limit and the appropriate datasheet values from Table 1 on page 4 into Equation 1 and simplifying. The result is Equation 3, where VF = 2.8 V, IF = 10 mA, and VDD = 18 V.
14
Rev. 0.22
SI8220/21
- 10 1.35 10 C L max = ----------------------------- - 1.85 10 F where: -3
C L max is the maximum load (pF) allowable at switching frequency F
Equation 3. A graph of Equation 3 is shown in Figure 12. Each point along the load line in this graph represents the package dissipation-limited value of CL for the corresponding switching frequency.
10,000
Load (pF)
1,000
100 0 500 1,000 1,500 2,000 2,500 Frequency (KHz)
Figure 12. Maximum Load vs. Switching Frequency
6.4. Input Circuit Design
Opto driver manufacturers typically recommend the circuits shown in Figures 13 and 14. These circuits are specifically designed to improve opto-coupler input common-mode rejection and increase noise immunity.
OPTO DRIVER Vdd
1 N/C
R1
2 ANODE
Control Input Open Drain or Collector
3 CATHODE
4 N/C
Figure 13. Opto Driver Input Circuit
Rev. 0.22
15
SI8220/21
Vdd OPTO DRIVER
1 N/C 2 ANODE
Control Input
Q1
3 CATHODE
R1
4 N/C
Figure 14. High CMR Opto Driver Input Circuit
The optically-coupled driver circuit of Figure 13 turns the LED on when the control input is high. However, internal capacitive coupling from the LED to the power and ground conductors can momentarily force the LED into its off state when the anode and cathode inputs are subjected to a high common-mode transient. The circuit shown in Figure 14 addresses this issue by using a value of R1 sufficiently low to overdrive the LED, ensuring it remains on during an input common-mode transient. Q1 shorts the LED off in the low output state, again increasing commonmode transient immunity. Some opto driver applications also recommend reverse-biasing the LED when the control input is off to prevent coupled noise from energizing the LED. The SI8220/21 can be used with the input circuits shown in Figures 13 and 14; however, some applications will require increasing the value of R1 in order to limit IF to a maximum of 10 mA. The SI8220/21 propagation delay and output drive do not change for values of IF between IF(MIN) and IF(MAX). New designs should consider the input circuit configurations of Figure 15, which are more efficient than those of Figures 13 and 14. As shown, S1 represents any suitable switch, such as a BJT or MOSFET, analog transmission gate, processor I/O, etc. Also, note that the SI8220/21 input can be driven from the I/O port of any MCU or FPGA capable of sourcing a minimum of 5 mA (see Figure 15C).
+5V
1
SI8220/21
N/C ANODE CATHODE
Control Input
+5V
1
SI8220/21
N/C ANODE CATHODE R1
MCU I/O Port pin 1 2
SI8220/21
N/C ANODE
R1
2
S1
See Text 2
3 Control Input
3
3 CATHODE
S1
See Text
4
N/C
R1
4
N/C
4 N/C
A
B
C
Figure 15. SI8220/21 Other Input Circuit Configurations
16
Rev. 0.22
SI8220/21
6.5. Parametric Differences between SI8220/21 and HCPL-0302 and HCPL-3120 Opto Drivers
The SI8220/21 is designed to directly replace HCPL-3120 and similar opto drivers. Parametric differences are summarized in Table 10 below.
Table 10. Parametric Differences of SI8220 vs. HCPL-3120
Parameter Max supply voltage ON state forward input current OFF state input voltage Max reverse input voltage UVLO threshold (rising) UVLO threshold (falling) UVLO hysteresis Rise/fall time into 10 in series with 10 nF SI8220 24 5 to 20 -0.6 to +1.6 0.5 5.8 to 13.8 5.5 to 12.8 0.28 to 1 20 HCPL-3120 30 7 to 16 -0.3 to +0.8 -5 11.0 to 13.5 9.7 to 12.0 1.6 100 Units V mA V V V V V ns
Table 11. Parametric Differences of Si8221 vs. HCPL-0302
Parameter Max supply voltage ON state forward input current OFF state input voltage Max reverse input voltage UVLO threshold (rising) UVLO threshold (falling) UVLO hysteresis Rise/fall time into 10 in series with 10 nF 6.5.1. Supply Voltage and UVLO The supply voltage of the SI8220/21 is limited to 24 V, and the UVLO voltage thresholds are scaled accordingly. This will not be an issue for opto replacement applications operating with supply voltages of 24 V and below. 6.5.2. Input Diode Differences The SI8220/21 input circuit requires less current and has twice the off-state noise margin compared to opto drivers. However, high CMR opto driver designs that overdrive the LED (see Figure 14) may require increasing the value of R1 to limit input current to 10 mA max. In addition, there is no benefit in driving the SI8220/21 input diode into reverse bias when in the off state. Consequently, opto driver circuits using this technique should either leave the negative bias circuitry unpopulated or modify the circuitry (e.g. add a clamp diode) to ensure that the anode pin of the SI8220/21 is no more than -0.8 V with respect to the cathode when reverse-biased. Si8221 24 5 to 20 -0.6 to +1.6 0.5 5.8 to 13.8 5.5 to 12.8 0.28 to 1 20 HCPL-0302 30 7 to 16 -0.3 to +0.8 -5 11.0 to 13.5 9.7 to 12.0 1.6 100 Units V mA V V V V V ns
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6.6. RF Radiated Emissions
The Si822x family uses an RF carrier frequency of approximately 700 MHz. This results in a small amount of radiated emissions at this frequency and its harmonics. The radiation is not from the IC chip but, rather, is due to a small amount of RF energy driving the isolated ground planes, which can act as a dipole antenna. The unshielded Si822x evaluation board passes FCC Class B (Part 15) requirements. Table 12 shows measured emissions compared to FCC requirements. Note that the data reflects worst-case conditions where all inputs are tied to logic 1 and the RF transmitters are fully active. Radiated emissions can be reduced if the circuit board is enclosed in a shielded enclosure or if the PCB is a less efficient antenna.
Table 12. Radiated Emissions (Preliminary)
Frequency (MHz) 712 1424 2136 2848 4272 4984 5696 Measured (dBV/m) 29 39 42 43 44 44 44 FCC Spec (dBV/m) 37 54 54 54 54 54 54 Compared to Spec (dB) -8 -15 -12 -11 -10 -10 -10
6.7. RF, Magnetic, and Common Mode Transient Immunity
The SI8220/21 families have very high common mode transient immunity while transmitting data. This is typically measured by applying a square pulse with very fast rise/fall times between the isolated grounds. Measurements show no failures at 30 kV/s (minimum). During a high surge event, the output may glitch low for up to 20-30 ns, but the output corrects immediately after the surge event. The SI8220/21 families pass the industrial requirements of CISPR24 for RF immunity of 10 V/m using an unshielded evaluation board. As shown in Figure 16, the isolated ground planes form a parasitic dipole antenna. The PCB should be laid-out to not act as an efficient antenna for the RF frequency of interest. RF susceptibility is also significantly reduced when the end system is housed in a metal enclosure, or otherwise shielded. The SI8220/21 digital isolator can be used in close proximity to large motors and various other magnetic-field producing equipment. In theory, data transmission errors can occur if the magnetic field is too large and the field is too close to the isolator. However, in actual use, the SI8220/21 devices provide extremely high immunity to external magnetic fields and have been independently evaluated to withstand magnetic fields of at least 1000 A/m according to the IEC 61000-4-8 and IEC 61000-4-9 specifications.
GND1
Isolator
GND2
Dipole Antenna
Figure 16. Dipole Antenna
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7. Pin Descriptions (Narrow-Body SOIC)
SI8220/21 8 1 7 2 6 3 5 4
Top View
Figure 17. Pin Configuration Table 13. Pin Descriptions (Narrow-Body SOIC)
Pin 1 2 3 4 5 6 7 8 Name NC ANODE No connect. Anode of LED emulator. VO follows the signal applied to this input with respect to the CATHODE input. Description
NC ANODE CATHODE NC
VDD VO VO VSS
CATHODE Cathode of LED emulator. VO follows the signal applied to ANODE with respect to this input. NC VSS VO VO VDD No connect. External MOSFET source connection and ground reference for VDD. This terminal is typically connected to ground but may be tied to a negative or positive voltage. Output signal. Pins 6 and 7 are connected together internally. Output signal. Pins 6 and 7 are connected together internally. Output-side power supply input referenced to VSS (24 V max).
*Note: No Connect. These pins are not internally connected.
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8. Pin Descriptions (Wide-Body SOIC)
SI8220
CATHODE NC NC ANODE NC NC CATHODE NC
1 2 3 4 5 6 7 8
Top View
16 15 14 13 12 11 10 9
VSS VDD NC VO NC NC NC VSS
Table 14. Pin Descriptions (Wide-Body SOIC)
Pin 1,7 2,3,5,6,8, 10,11,12, 14 4 9,16 13 15 Name Description
CATHODE Cathode of LED emulator. VO follows the signal applied to ANODE with respect to this input. NC* No connect.
ANODE VSS VO VDD
Anode of LED emulator. VO follows the signal applied to this input with respect to the CATHODE input. External MOSFET source connection and ground reference for VDD. This terminal is typically connected to ground but may be tied to a negative or positive voltage. Output signal. Output-side power supply input referenced to VSS (24 V max).
*Note: No Connect. These pins are not internally connected.
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9. Ordering Guide
Not all possible device configuration options and their corresponding ordering part numbers (OPN) are included in the Ordering Guide table. However, if there is a specific device configuration of interest that is currently not listed in the Ordering Guide table, please contact your local Silicon Labs sales representative, or go to the Silicon Labs Technical Support web page at https://www.silabs.com/support/pages/contacttechnicalsupport.aspx and register to submit a request to create your specific device configuration and OPN.
Si82CIUV-R-TPn
ISOdriver Product Input Configuration (2 = Opto-input) Peak Output Current (0=2.5A, 1=0.5A) UVLO* level (A=5V, B=8V, C=10V, D=12.5V) Insulation Rating (A=1kV,B=2.5kV,C=3.75kV,D=5kV) Product Revision Temp Range (I=-40 to +125C) Package Type (S=SOIC) Package Extension (1=Narrow Body)
*UVLO= Under Voltage Lock Out
Figure 18. SI8220/21 OPN Naming Convention
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Table 15. SI8220/21 Ordering Guide*
Ordering Options New Ordering Part Number (OPN) SI8220BB-A-IS SI8220CB-A-IS SI8220DB-A-IS SI8220BD-A-IS SI8220CD-A-IS SI8220DD-A-IS Si8221CC-A-IS Si8221DC-A-IS Input Configuration Opto input Opto input Opto input Opto input Opto input Opto input Opto input Opto input Peak Output Current (Cross Reference) 2.5 A (HCPL-3120) 2.5 A (HCPL-3120) 2.5 A (HCPL-3120) 2.5 A (HCPL-3120) 2.5 A (HCPL-3120) 2.5 A (HCPL-3120) 0.5 A (HCPL-0302) 0.5 A (HCPL-0302) UVLO Voltage 8V default 10 V 12.5 V 8V default 10 V 12.5 V 10 V 12.5 V Insulation Rating 2.5 kVrms 2.5 kVrms 2.5 kVrms 5.0 kVrms 5.0 kVrms 5.0 kVrms 3.75 kVrms 3.75 kVrms Temp Range -40 to +125 C -40 to +125 C -40 to +125 C -40 to +125 C -40 to +125 C -40 to +125 C -40 to +125 C -40 to +125 C Pkg Type SOIC-8 SOIC-8 SOIC-8 WB SOIC-16 WB SOIC-16 WB SOIC-16 SOIC-8 SOIC-8
*Note: All packages are RoHS-compliant. Moisture sensitivity level is MSL3 with peak reflow temperature of 260 C according to the JEDEC industry standard classifications and peak solder temperature.
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10. Package Outline: 8-Pin Narrow Body SOIC
Figure 19 illustrates the package details for the Si822x. Table 16 lists the values for the dimensions shown in the illustration.
Figure 19. 8-pin Small Outline Integrated Circuit (SOIC) Package Table 16. Package Diagram Dimensions
Symbol A A1 A2 B C D E e H h L Millimeters Min 1.35 0.10 1.40 REF 0.33 0.19 4.80 3.80 5.80 0.25 0.40 0 Max 1.75 0.25 1.55 REF 0.51 0.25 5.00 4.00 6.20 0.50 1.27 8
1.27 BSC
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11. Land Pattern: 8-Pin Narrow Body SOIC
Figure 20 illustrates the recommended land pattern details for the Si822x in an 8-pin narrow-body SOIC. Table 17 lists the values for the dimensions shown in the illustration.
Figure 20. PCB Land Pattern: 8-Pin Narrow Body SOIC Table 17. PCM Land Pattern Dimensions (8-Pin Narrow Body SOIC)
Dimension C1 E X1 Y1 Feature Pad Column Spacing Pad Row Pitch Pad Width Pad Length (mm) 5.40 1.27 0.60 1.55
Notes: 1. This Land Pattern Design is based on IPC-7351 pattern SOIC127P600X173-8N for Density Level B (Median Land Protrusion). 2. All feature sizes shown are at Maximum Material Condition (MMC) and a card fabrication tolerance of 0.05 mm is assumed.
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12. Package Outline: 16-Pin Wide Body SOIC
Figure 21 illustrates the package details for the Si822x Digital Isolator. Table 18 lists the values for the dimensions shown in the illustration.
Figure 21. 16-Pin Wide Body SOIC Table 18. Package Diagram Dimensions
Millimeters Symbol A A1 D E E1 b c e h L Min -- 0.1 Max 2.65 0.3
10.3 BSC 10.3 BSC 7.5 BSC 0.31 0.20 0.25 0.4 0 0.51 0.33 0.75 1.27 7
1.27 BSC
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13. Land Pattern: 16-Pin Wide-Body SOIC
Figure 22 illustrates the recommended land pattern details for the Si822x in a 16-pin wide-body SOIC. Table 19 lists the values for the dimensions shown in the illustration.
Figure 22. 16-Pin SOIC Land Pattern Table 19. 16-Pin Wide Body SOIC Land Pattern Dimensions
Dimension C1 E X1 Y1 Feature Pad Column Spacing Pad Row Pitch Pad Width Pad Length (mm) 9.40 1.27 0.60 1.90
Notes: 1. This Land Pattern Design is based on IPC-7351 pattern SOIC127P1032X265-16AN for Density Level B (Median Land Protrusion). 2. All feature sizes shown are at Maximum Material Condition (MMC) and a card fabrication tolerance of 0.05 mm is assumed.
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NOTES:
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CONTACT INFORMATION
Silicon Laboratories Inc. 400 West Cesar Chavez Austin, TX 78701 Tel: 1+(512) 416-8500 Fax: 1+(512) 416-9669 Toll Free: 1+(877) 444-3032 Please visit the Silicon Labs Technical Support web page: https://www.silabs.com/support/pages/contacttechnicalsupport.aspx and register to submit a technical support request.
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where personal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized application, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages. The sale of this product contains no licenses to Power-One's intellectual property. Contact Power-One, Inc. for appropriate licenses. Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
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