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FOD2711 -- Optically Isolated Error Amplifier
August 2008
FOD2711 Optically Isolated Error Amplifier
Features
Optocoupler, precision reference and error amplifier in
Description
The FOD2711 Optically Isolated Amplifier consists of the popular RC431A precision programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide (GaAs) light emitting diode optically coupled to a silicon phototransistor. The reference voltage tolerance is 1%. The current transfer ratio (CTR) ranges from 100% to 200%. It is primarily intended for use as the error amplifier/ reference voltage/optocoupler function in isolated AC to DC power supplies and dc/dc converters. When using the FOD2711, power supply designers can reduce the component count and save space in tightly packaged designs. The tight tolerance reference eliminates the need for adjustments in many applications. The device comes in a 8-pin dip white package.
single package 1.240V 1% reference CTR 100% to 200% 5,000V RMS isolation UL approval E90700, Volume 2 CSA approval 1296837 VDE approval 40002463 BSI approval 8702, 8703
Applications
Power supplies regulation DC to DC converters
Functional Bock Diagram
Package Outlines
NC
1
8 LED
8 1
C
2
7 FB
E
3
6 COMP
8 8 1 1
NC
4
5 GND
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
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FOD2711 -- Optically Isolated Error Amplifier
Pin Definitions
Pin Number
1 2 3 4 5 6 7 8
Pin Name
NC C E NC GND COMP FB LED Not connected Phototransistor Collector Phototransistor Emitter Not connected Ground
Pin Description
Error Amplifier Compensation. This pin is the output of the error amplifier.* Voltage Feedback. This pin is the inverting input to the error amplifier Anode LED. This pin is the input to the light emitting diode.
*The compensation network must be attached between pins 6 and 7.
Typical Application
V1
FAN4803 PWM Control
VO
FOD2711 2 8
6
R1
3
7 R2
5
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
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FOD2711 -- Optically Isolated Error Amplifier
Absolute Maximum Ratings (TA = 25C unless otherwise specified)
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.
Symbol
TSTG TOPR TSOL VLED ILED VCEO VECO IC PD1 PD2 PD3
Parameter
Storage Temperature Operating Temperature Lead Solder Temperature Input Voltage Input DC Current Collector-Emitter Voltage Emitter-Collector Voltage Collector Current Input Power Dissipation(1) Transistor Power Dissipation(2) Total Power Dissipation(3)
Value
-40 to +125 -40 to +85 260 for 10 sec. 13.2 20 30 7 50 145 85 145
Units
C C C V mA V V mA mW mW mW
Notes: 1. Derate linearly from 25C at a rate of 2.42mW/C 2. Derate linearly from 25C at a rate of 1.42mW/C. 3. Derate linearly from 25C at a rate of 2.42mW/C.
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
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FOD2711 -- Optically Isolated Error Amplifier
Electrical Characteristics (TA = 25C unless otherwise specified)
Input Characteristics Symbol
VF VREF
Parameter
LED Forward Voltage Reference Voltage -40C to +85C 25C
Test Conditions
ILED = 10mA, VCOMP = VFB (Fig. 1) VCOMP = VFB, ILED = 10mA (Fig.1)
Min. Typ.* Max.
1.5 1.221 1.228 1.240 4 -1.5 1.259 1.252 12 -2.7
Unit
V V mV mV/V
VREF (DEV) Deviation of VREF Over Temperature(4) VREF / VCOMP IREF IREF (DEV) ILED (MIN) I(OFF) | ZOUT | Ratio of Vref Variation to the Output of the Error Amplifier Feedback Input Current Deviation of IREF Over Temperature(4) Minimum Drive Current Off-State Error Amplifier Current Error Amplifier Output Impedance(5)
TA = -40 to +85C ILED = 10 mA, VCOMP = VREF to 12V (Fig. 2) ILED = 10mA, R1 = 10k (Fig. 3) TA = -40C to +85C VCOMP = VFB (Fig. 1) VLED = 6V, VFB = 0 (Fig. 4) VCOMP = VFB, ILED = 0.1mA to 15mA, f<1 kHZ)
0.15 0.15 55 0.001 0.25
0.5 0.3 80 0.1
A A A A
Output Characteristics Symbol
ICEO BVECO BVCEO
Parameter
Collector Dark Current Emitter-Collector Voltage Breakdown Collector-Emitter Voltage Breakdown
Test Conditions
VCE = 10V (Fig. 5) IE = 100A IC = 1.0mA
Min.
7 70
Typ.
Max.
50
Unit
nA V V
Transfer Characteristics Symbol Parameter
CTR Current Transfer Ratio
Test Conditions
ILED = 10mA, VCOMP = VFB, VCE = 5V (Fig. 6) ILED = 10mA, VCOMP = VFB, IC = 2.5mA (Fig. 6)
Min.
100
Typ.
Max.
200 0.4
Unit
% V
VCE (SAT) Collector-Emitter Saturation Voltage
Notes: 4. The deviation parameters VREF(DEV) and IREF(DEV) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full-range temperature coefficient of the reference input voltage, VREF, is defined as: { V REF ( DEV ) /V REF ( T A = 25C ) } x 10 V REF ( ppm/C ) = ---------------------------------------------------------------------------------------------------T A
6
where TA is the rated operating free-air temperature range of the device. 5. The dynamic impedance is defined as |ZOUT| = VCOMP / ILED. When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: V R1 Z OUT, TOT = ------- Z OUT x 1 + ------I R2
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1 www.fairchildsemi.com 4
FOD2711 -- Optically Isolated Error Amplifier
Electrical Characteristics (Continued) (TA = 25C unless otherwise specified)
Isolation Characteristics Symbol
II-O VISO RI-O
Parameter
Input-Output Insulation Leakage Current Withstand Insulation Voltage Resistance (Input to Output)
Test Conditions
RH = 45%, TA = 25C, t = 5s, VI-O = 3000 VDC(6) RH 50%, TA = 25C, t = 1 min.(6) VI-O = 500 VDC(6)
Min.
Typ.
Max.
1.0
Unit
A Vrms
5000 1012
Switching Characteristics Symbol
BW CMH CML
Parameter
Bandwidth Common Mode Transient Immunity at Output HIGH Common Mode Transient Immunity at Output LOW
Test Conditions
(Fig. 7) ILED = 0mA, Vcm = 10 VPP, RL = 2.2k(7) (Fig. 8) ILED = 1mA, Vcm = 10 VPP, RL = 2.2k(7) (Fig. 8)
Min.
Typ.
10 1.0 1.0
Max.
Unit
kHZ kV/s kV/s
Notes: 6. Device is considered as a two terminal device: Pins 1, 2, 3 and 4 are shorted together and Pins 5, 6, 7 and 8 are shorted together. 7. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge of the common mode impulse signal, Vcm, to assure that the output will remain high. Common mode transient immunity at output low is the maximum tolerable (negative) dVcm/dt on the trailing edge of the common pulse signal,Vcm, to assure that the output will remain low.
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
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FOD2711 -- Optically Isolated Error Amplifier
Test Circuits
I(LED) I(LED) 8 VF 6 V 7 VREF 5 3 V R1 6 7 VCOMP R2 VREF 5 3 2 8 2
Figure 1. VREF, VF, ILED (min.) Test Circuit
Figure 2. VREF / VCOMP Test Circuit
I(LED) 8 2
I(OFF) 8 2
IREF 6 V R1 5 5 7 3 V 6 V(LED) 7 3
Figure 3. IREF Test Circuit
Figure 4. I(OFF) Test Circuit
8
ICEO 2 VCE
I(LED) 8 2 VCE 6 V 7 VCOMP VREF 3
IC
6 7
3
5
5
Figure 5. ICEO Test Circuit
Figure 6. CTR, VCE(sat) Test Circuit
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
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FOD2711 -- Optically Isolated Error Amplifier
Test Circuits (Continued)
VCC = +5V DC IF = 10mA RL 47
1
8
1f
VOUT
2
7
0.1 VPP
VIN 0.47V
3
6
4
5
Figure 7. Frequency Response Test Circuit
VCC = +5V DC IF = 0mA (A) IF = 10mA (B) R1 2.2k VOUT
1
8
2
7
AB
3
6
4
5
_
VCM
+
10VP-P
Figure 8. CMH and CML Test Circuit
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
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FOD2711 -- Optically Isolated Error Amplifier
Typical Performance Curves
Fig. 9a LED Current vs. Cathode Voltage
15
TA = 25C VCOMP = VFB
Fig. 9b LED Current vs. Cathode Voltage
150
TA = 25C VCOMP = VFB
ILED - SUPPLY CURRENT (mA)
5
ILED - SUPPLY CURRENT (mA) -0.5 0.0 0.5 1.0 1.5
10
100
50
0
0
-5
-50
-10
-100
-15 -1.0
-150 -1 VCOMP - CATHODE VOLTAGE (V) 0 1 VCOMP - CATHODE VOLTAGE (V) 2
Fig. 10 Reference Voltage vs. Ambient Temperature
1.244 VREF - REFERENCE VOLTAGE (V) 1.242 1.240 1.238 1.236 1.234 1.232 1.230 -40
ILED = 10mA
Fig. 11 Reference Current vs. Ambient Temperature
280 IREF - REFERENCE CURRENT (nA) 260 240 220 200 180 160 140 120 -40
ILED = 10mA R1 = 10 k
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
TA - AMBIENT TEMPERATURE (C)
TA - AMBIENT TEMPERATURE (C)
Fig. 12 Off-State Current vs. Ambient Temperature
1000 IOFF - OFF-STATE CURRENT (NA)
VCC = 13.2V
Fig. 13 Forward Current vs. Forward Voltage
20
IF - FORWARD CURRENT (mA)
100
15
10
10
70C
25C 0C
1
5
0.1 -40 -20 0 20 40 60 80 100 0.9 1.0 1.1 1.2 1.3 1.4 TA - AMBIENT TEMPERATURE (C)
VF - FORWARD VOLTAGE (V)
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
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FOD2711 -- Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
Fig. 14 Dark Current vs. Ambient Temperature
10000
VCE = 10V
Fig. 15 Collector Current vs. Ambient Temperature
30
VCE = 5V
ICEO - DARK CURRENT (nA)
1000
IC - COLLECTOR CURRENT (mA)
25
ILED = 20mA
20
100
15
ILED = 10mA
10
10
ILED = 5mA
1
5
ILED = 1mA
0.1 -40
-20
0
20
40
60
80
100
0 0 10 20 30 40 50 60 70 80 90 100 TA - AMBIENT TEMPERATURE (C)
TA - AMBIENT TEMPERATURE (C)
Fig. 16 Current Transfer Ratio vs. LED Current
(IC/IF) - CURRENT TRANSFER RATIO (%) 140 VCE(SAT) - SATURATION VOLTAGE (V)
VCE = 5V
Fig. 17 Saturation Voltage vs. Ambient Temperature
0.26 0.24 0.22 0.20 0.18 0.16 0.14 0.12 0.10 -40
120
0C 25C
100
80
70C
60
40 0
5
10
15
20
25
30
35
40
45
50
-20
0
20
40
60
80
100
ILED - FORWARD CURRENT (mA)
TA - AMBIENT TEMPERATURE (C)
Fig. 18 Collector Current vs. Collector Voltage
35 30 25 20 15 10
ILED = 5mA ILED = 10mA ILED = 20mA T A = 25C
Fig. 19 Rate of Change Vref to Vcomp vs. Temperature
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2 -1.4 -1.6 -60 -40 -20 0 20 40 60 80 100 120
5
ILED = 1mA
0 0 1 2 3 4 5 6 7 8 9 10 VCE - COLLECTOR-EMITTER VOLTAGE (V) TEMPERATURE (C)
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
DELTA VREF / DELTA VCOMP ( mV/V)
IC - COLLECTOR CURRENT (mA)
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FOD2711 -- Optically Isolated Error Amplifier
Typical Performance Curves (Continued)
Fig. 20 Voltage Gain vs. Frequency
VCC = 10V IF = 10mA
0 VOLTAGE GAIN (dB)
RL = 100
-5
-10
RL = 1k
-15 0.1 1 10 FREQUENCY (kHZ)
RL = 500
100
1000
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FOD2711 -- Optically Isolated Error Amplifier
The FOD2711
The FOD2711 is an optically isolated error amplifier. It incorporates three of the most common elements necessary to make an isolated power supply, a reference voltage, an error amplifier, and an optocoupler. It is functionally equivalent to the popular RC431A shunt voltage regulator plus the CNY17F-3 optocoupler.
Compensation
The compensation pin of the FOD2711 provides the opportunity for the designer to design the frequency response of the converter. A compensation network may be placed between the COMP pin and the FB pin. In typical low-bandwidth systems, a 0.1F capacitor may be used. For converters with more stringent requirements, a network should be designed based on measurements of the system's loop. An excellent reference for this process may be found in "Practical Design of Power Supplies" by Ron Lenk, IEEE Press, 1998.
Powering the Secondary Side
The LED pin in the FOD2711 powers the secondary side, and in particular provides the current to run the LED. The actual structure of the FOD2711 dictates the minimum voltage that can be applied to the LED pin: The error amplifier output has a minimum of the reference voltage, and the LED is in series with that. Minimum voltage applied to the LED pin is thus 1.24V + 1.5V = 2.74V. This voltage can be generated either directly from the output of the converter, or else from a slaved secondary winding. The secondary winding will not affect regulation, as the input to the FB pin may still be taken from the output winding. The LED pin needs to be fed through a current limiting resistor. The value of the resistor sets the amount of current through the LED, and thus must be carefully selected in conjunction with the selection of the primary side resistor.
Secondary Ground
The GND pin should be connected to the secondary ground of the converter.
No Connect Pins
The NC pins have no internal connection. They should not have any connection to the secondary side, as this may compromise the isolation structure.
Photo-Transistor
The Photo-transistor is the output of the FOD2711. In a normal configuration the collector will be attached to a pull-up resistor and the emitter grounded. There is no base connection necessary. The value of the pull-up resistor, and the current limiting resistor feeding the LED, must be carefully selected to account for voltage range accepted by the PWM IC, and for the variation in current transfer ratio (CTR) of the opto-isolator itself. Example: The voltage feeding the LED pins is +12V, the voltage feeding the collector pull-up is +10V, and the PWM IC is the Fairchild KA1H0680, which has a 5V reference. If we select a 10K resistor for the LED, the maximum current the LED can see is: (12V-2.74V) / 10k = 926A. The CTR of the opto-isolator is a minimum of 100%, and so the minimum collector current of the photo-transistor when the diode is full on is also 926A. The collector resistor must thus be such that: 10V - 5V ----------------------------------- < 926A or R COLLECTOR > 5.4K; R COLLECTOR select 10k to allow some margin.
Feedback
Output voltage of a converter is determined by selecting a resistor divider from the regulated output to the FB pin. The FOD2711 attempts to regulate its FB pin to the reference voltage, 1.24V. The ratio of the two resistors should thus be: R TOP V OUT ------------------------- = -------------- - 1 R BOTTOM V REF The absolute value of the top resistor is set by the input offset current of 0.8A. To achieve 1% accuracy, the resistance of RTOP should be: V OUT - 1.24 ------------------------------- > 80A R TOP
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
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FOD2711 -- Optically Isolated Error Amplifier
Package Dimensions
Through Hole
PIN 1 ID.
4 3 2 1
4 3 2 1
0.4" Lead Spacing
PIN 1 ID.
0.270 (6.86) 0.250 (6.35)
5 6 7 8
0.270 (6.86) 0.250 (6.35)
0.390 (9.91) 0.370 (9.40)
5
6
7
8
SEATING PLANE
0.070 (1.78) 0.045 (1.14) 0.200 (5.08) 0.140 (3.55) 0.020 (0.51) MIN
SEATING PLANE
0.390 (9.91) 0.370 (9.40) 0.070 (1.78) 0.045 (1.14) 0.200 (5.08) 0.140 (3.55) 0.004 (0.10) MIN
0.154 (3.90) 0.120 (3.05) 0.022 (0.56) 0.016 (0.41) 0.100 (2.54) TYP 0.016 (0.40) 0.008 (0.20) 15 MAX 0.300 (7.62) TYP
0.154 (3.90) 0.120 (3.05) 0.022 (0.56) 0.016 (0.41) 0.100 (2.54) TYP 0.016 (0.40) 0.008 (0.20) 0 to 15 0.400 (10.16) TYP
Surface Mount
0.390 (9.91) 0.370 (9.40)
4 3 2 1
8-Pin DIP - Land Pattern
0.070 (1.78)
PIN 1 ID.
0.270 (6.86) 0.250 (6.35)
0.060 (1.52)
5
6
7
8
0.100 (2.54) 0.295 (7.49) 0.415 (10.54) 0.030 (0.76)
0.070 (1.78) 0.045 (1.14) 0.020 (0.51) MIN
0.300 (7.62) TYP 0.016 (0.41) 0.008 (0.20)
0.022 (0.56) 0.016 (0.41) 0.100 (2.54) TYP Lead Coplanarity : 0.004 (0.10) MAX
0.045 (1.14) 0.315 (8.00) MIN 0.405 (10.30) MAX.
Note: All dimensions are in inches (millimeters)
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
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FOD2711 -- Optically Isolated Error Amplifier
Ordering Information
Option
No Option S SD T V TV SV SDV
Example Part Number
FOD2711A FOD2711AS FOD2711ASD FOD2711AT FOD2711AV FOD2711ATV FOD2711ASV FOD2711ASDV
Description
Standard Through Hole Surface Mount Lead Bend Surface Mount; Tape and Reel 0.4" Lead Spacing VDE0884 VDE0884; 0.4" Lead Spacing VDE0884; Surface Mount VDE0884; Surface Mount; Tape and Reel
Marking Information
1
2711 V
3 4
2 6
XX YY B
5
Definitions
1 2 3 4 5 6
Fairchild logo Device number VDE mark (Note: Only appears on parts ordered with VDE option - See order entry table) Two digit year code, e.g., `03' Two digit work week ranging from `01' to `53' Assembly package code
(c)2003 Fairchild Semiconductor Corporation FOD2711 Rev. 1.0.1
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FOD2711 -- Optically Isolated Error Amplifier
Carrier Tape Specifications
D0 K0
t
P0
P2
E
A0 W1 B0
F W
d
User Direction of Feed
P
D1
Symbol
W t P0 D0 E F P2 P A0 B0 K0 W1 d R Pocket Pitch Tape Width
Description
Tape Thickness Sprocket Hole Pitch Sprocket Hole Diameter Sprocket Hole Location Pocket Location
Dimension in mm
16.0 0.3 0.30 0.05 4.0 0.1 1.55 0.05 1.75 0.10 7.5 0.1 4.0 0.1 12.0 0.1 10.30 0.20 10.30 0.20 4.90 0.20
Pocket Dimensions
Cover Tape Width Cover Tape Thickness Max. Component Rotation or Tilt Min. Bending Radius
1.6 0.1 0.1 max 10 30
Reflow Profile
300 Temperature (C) 250 200 150 100 50 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Time (Minute) * Peak reflow temperature: 260 C (package surface temperature) * Time of temperature higher than 183 C for 160 seconds or less * One time soldering reflow is recommended
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245 C, 10-30 s 260 C peak
Time above 183C, <160 sec Ramp up = 2-10C/sec
FOD2711 -- Optically Isolated Error Amplifier
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Rev. I35
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