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APW7207
1MHz, High-Efficiency, Step-Up Converter for 2 to 6 White LEDs
Features
* * * * * * * * * * *
Wide Input Voltage from 2.5V to 6V 0.2V Reference Voltage Fixed 1MHz Switching Frequency High Efficiency up to 88% 100Hz to 100kHz PWM Brightness Control Frequency Open-LED Protection Under-Voltage Lockout Protection Over-Temperature Protection <1A Quiescent Current During Shutdown TSOT-23-6A Packages Lead Free and Green Devices Available (RoHS Compliant)
General Description
The APW7207 is a current-mode and fixed frequency boost converter with an integrated N-FET to drive up to 6 white LEDs in series. The series connection allows the LED current to be identical for uniform brightness. Its low on-resistance of NFET and feedback voltage reduces power loss and achieves high efficiency. Fast 1MHz current-mode PWM operation is available for input and output capacitors and a small inductor while minimizing ripple on the input supply. The OVP pin monitors the output voltage and stops switching if exceeds the over-voltage threshold. An internal soft-start circuit eliminates the inrush current during start-up. The APW7207 also integrates under-voltage lockout, over-temperature protection, and current limit circuits. The APW7207 is available in TSOT-23-6A packages.
Applications
* * * *
White LED Display Backlighting
Pin Configuration
LX 1 6 VIN 5 OVP 4 EN
Cell Phone and Smart Phone PDA, PMP, and MP3 Digital Camera
GND 2 FB 3
TSOT-23-6A (Top View)
Simplified Application Circuit
VIN
C1 2.2F 2 4 L1 22H 6 VIN GND EN LX OVP FB 1 5 3 R1 10 C2 1F
VOUT
Up to 6 WLEDs
OFF ON
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Copyright (c) ANPEC Electronics Corp. Rev. A.2 - Dec., 2009 1 www.anpec.com.tw
APW7207
Ordering and Marking Information
APW7207 Assembly Material Handling Code Temperature Range Package Code APW7207 CT : W07X Package Code CT : TSOT-23-6A Operating Ambient Temperature Range I : -40 to 85 oC Handling Code TR : Tape & Reel Assembly Material G : Halogen and Lead Free Device X - Date Code
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020D for MSL classification at lead-free peak reflow temperature. ANPEC defines "Green" to mean lead-free (RoHS compliant) and halogen free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by weight).
Absolute Maximum Ratings (Note 1)
Symbol VIN Parameter VIN Supply Voltage (VIN to GND) FB, EN to GND Voltage VLX VOVP TJ TSTG TSDR LX to GND Voltage OVP to GND Voltage Maximum Junction Temperature Storage Temperature Maximum Lead Soldering Temperature, 10 Seconds Rating -0.3 ~ 7 -0.3 ~ VIN -0.3 ~ 30 -0.3 ~ 28 150 -65 ~ 150 260 Unit V V V V C C C
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Thermal Characteristics
Symbol JA Parameter Junction to Ambient Thermal Resistance. (Note 2) TSOT-23-6A Typical Value 220 Unit C/W
Note 2: JA is measured with the component mounted on a high effective thermal conductivity test board in free air.
Recommended Operating Conditions (Note 3)
Symbol VIN VOUT CIN COUT L1 TA TJ VIN Input Voltage Converter Output Voltage Input Capacitor Output capacitor Inductor Ambient Temperature Junction Temperature Parameter Range 2.5~ 6 Up to 23 2.2 or higher 0.47 or higher 6.8 ~ 22 -40 ~ 85 -40 ~ 125 Unit V V F F H C C
Note 3: Refer to the application circuit for further information. Copyright (c) ANPEC Electronics Corp. Rev. A.2 - Dec., 2009 2 www.anpec.com.tw
APW7207
Electrical Characteristics
Refer to figure 1 in the "Typical Application Circuits". These specifications apply over VIN = 3.6V, TA = -40 ~ 85C unless otherwise noted.
Symbol
Parameter
Test Conditions
APW7207 Min. 2.5 70 2.2 50 190 -50 Typ. 100 1 2.3 100 200 1.0 0.6 1.2 95 25 Max. 6 130 2 1 2.48 150 210 50 1.2 1.2 1 98 27 4 45
Unit
SUPPLY VOLTAGE AND CURRENT VIN IDD1 IDD2 ISD UNDER VOLTAGE LOCKOUT UVLO Threshold Voltage UVLO Hysteresis Voltage REFERENCE AND OUTPUT VOLTAGES VREF IFB FSW RON ILIM DMAX VOVP Regulated Feedback Voltage FB Input Current Switching Frequency Power Switch On Resistance Power Switch Current Limit LX Leakage Current LX Maximum Duty Cycle Over Voltage Threshold OVP Hysteresis OVP Leakage Current ENABLE AND SHUTDOWN VTEN High-Level Input Voltage of EN Low-Level Input Voltage of EN ILEN TOTP EN Leakage Current Over-Temperature Protection Over-Temperature Protection Hysteresis VEN= 0~5V, VIN = 5V TJ Rising OVER-TEMPERATURE PROTECTION 150 40 C C 1 -1 0.4 1 V V A VOVP =24V OUTPUT OVER VOLTAGE PROTECTION 23 1 V V A VEN=0V, VLX=0V or 5V, VIN = 5V FB=GND mV nA MHz A A % VIN Rising V mV Input DC bias current Input Voltage Range TA = -40 ~ 85C, TJ = -40 ~ 125C VFB = 0.3V, no switching FB = GND, switching EN = GND V A mA A
INTERNAL POWER SWITCH 0.8 1.0 -1 92
Copyright (c) ANPEC Electronics Corp. Rev. A.2 - Dec., 2009
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APW7207
Typical Operating Characteristics
(Refer to figure 1 in the section "Typical Application Circuits", VIN=3.6V, TA=25oC, 6WLEDs unless otherwise specified)
Efficiency vs. WLED Current
95 90 85
95 90 85
Efficiency vs. WLED Current
Efficiency ()
75 70 65 VIN=3.6V 60 55 50 0 5 10 15 20 25 30 VIN=3.3V 6 WLEDs VIN=4.2V VIN=5V
E ffic ie n c y (
)
80
80 75 70 65 60 VIN=3.6V VIN=3.3V 4 WLEDs 13V@20mA =POUT/PIN 10 15 20 (mA) LED 25 30 VIN=4.2V VIN=5V
19.3V@20mA
=POUT/PIN
55 50 0 5
, ()
WLED Current, I
WLED Current vs. PWM Duty Cycle
20
Switching Frequency vs. Supply Voltage
1.2
Switching Frequency, FS (MHz) W
100
18
1.1 1 0.9 0.8 0.7 0.6 0.5 0.4
W LED C urrent, I LED (m A)
16 14 12 10 8 6 4 2 0 0 20 40 60 80 100Hz 1kHz 100kHz
2.5
3
3.5
4
4.5
5
5.5
6
PWM Duty Cycle
(%)
Supply Voltage, VIN(V)
WLED Current vs. Supply Voltage
21.0 S w itch ON R esistance, R ON ([) 20.8
Switch ON Resistance vs. Supply Voltage
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
W LED Current, ILED (m A)
20.6 20.4 20.2 20.0 19.8 19.6 19.4 19.2 19.0 2.5 3 3.5 4 4.5 5 5.5 6
2.5
3
3.5
4
4.5
5
IN(V)
5.5
6
Supply Voltage, V
IN(V)
Supply Voltage, V
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APW7207
Operating Waveforms
(Refer to the application circuit in the section "Typical Application Circuits", VIN=3.6V, TA=25oC, 6WLEDs unless otherwise specified)
Start-up 1
VIN VEN
Start-up 1
VIN VEN
2
VOUT
2
VOUT
3
IIN, 0.1A/Div
3
IIN, 0.1A/Div
4
6WLEDs, L=22H, VIN=3.6V, ILED=20mA
4
4WLEDs, L=22H, VIN=3.6V, ILED=20mA
CH1: EN2V/Div, DC V, CH2: IN 2V/Div, DC V , CH3: OUT V , 10V/Div, DC CH4:IN 0.1A/Div, DC I, Time: 1ms/Div
CH1: EN2V/Div, DC V, CH2: IN 2V/Div, DC V , CH3: OUT V , 10V/Div, DC CH4:IN 0.1A/Div, DC I, Time: 1ms/Div
Open-LED Protection
Normal Operating Waveform
VLX, 20V/Div, DC
VOUT, 10V/Div
1
VOUT, 50mV/Div, AC
1
2
3
IL, 0.1A/Div 6WLEDs, L=22H, VIN=3.6V, ILED=20mA
CH1: OUT V , 10V/Div, DC Time: 20ms/Div
CH1: VLX 20V/Div, DC , CH2: VOUT50mV/Div, AC , CH3: IL, 0.1A/Div, DC Time: 1s/Div
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APW7207
Pin Description
PIN NO. 1 2 3 NAME LX GND FB Power and signal ground pin. Feedback Pin. Reference voltage is 0.2V. Connect this pin to cathode of the lowest LED and resistor (R1). Calculate resistor value according to R1=0.2V/ILED. Enable Control Input. Forcing this pin above 1.0V enables the device, or forcing this pin below 0.4V to shut it down. In shutdown, all functions are disabled to decrease the supply current below 1A. Do not leave this pin floating. Over-Voltage Protection pin. OVP is connected to the output capacitor of the converter. Main Supply Pin. Must be closely decoupled to the GND with a 2.2F or greater ceramic capacitor. FUNCTION Switch pin. Connect this pin to inductor/diode here.
4 5 6
EN OVP VIN
Block Diagram
VIN
EN
UVLO
OVP
LX
Gate Driver Control Logic
OverTemperature Protection Slope Compensation
Current limit
Current Sense Amplifier
ICMP Error Amplifier FB COMP EAMP VREF 0.2V
Oscillator
GND
SoftStart
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APW7207
Typical Application Circuits
VIN
L1 22H C1 2.2F 6 1 C2 1F C1 2.2F Up to 6 WLEDs 100Hz~100kHz 3 R1 10 Duty=100%, ILED=20mA Duty=0%, LED off 4 6
VOUT
VIN
L1 22H 1 C2 1F
VOUT
VIN
LX
VIN
LX
2
GND
OVP
5
2
Up to 6 WLEDs
GND
OVP
5
4 OFF ON
APW7207
EN FB
APW7207
EN FB 3 R1 10
Figure 1. Typical 6 WLEDs Application
Figure 2. Brightness control using a PWM signal applies to EN
VIN
C1 10F
L1 10H 6 1 C2 10F
VOUT
6S2P WLEDs LX ILED1 ILED2
VIN
Enable(EN) PWM Brightness Control 100Hz~100kHz Duty=100%, ILED1/2 20mA Duty=0%, LED off R3 1M R2 100k Q1 BSS138
2
GND
OVP
5
APW7207
4 EN FB 3 R1 5.1
Figure 3. Separate Enable and PWM Brightness Control Using a MOSFET
VIN 4.5V~6V
C1 10F 6 VIN
L1 10H 1
VOUT
LX
C2 10F
9 Strings total
2
GND
OVP
5
4 OFF ON
APW7207
EN FB 3 R1 1.1
Figure 4. Circuit for driving 27 WLEDs
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APW7207
Function Description
Main Control Loop The APW7207 is a constant frequency current-mode switching regulator. During normal operation, the internal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and turned off when an internal comparator (ICMP) resets the latch. The peak inductor current at which ICMP resets the RS latch is controlled by the voltage on the COMP node, which is the output of the error amplifier (EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an output feedback voltage VFB at FB pin. When the load current increases, it causes a slightly decrease in VFB relative to the 0.2V reference, which in turn causes the COMP voltage to increase until the average inductor current matches the new load current. VIN Under-Voltage Lockout (UVLO) The Under-Voltage Lockout (UVLO) circuit compares the input voltage at VIN with the UVLO threshold (2.3V rising, typical) to ensure the input voltage is high enough for reliable operation. The 100mV (typ) hysteresis prevents supply transients from causing a restart. Once the input voltage exceeds the UVLO rising threshold, start-up begins. When the input voltage falls below the UVLO falling threshold, the controller turns off the converter. Soft-Start The APW7207 has a built-in soft-start to control the Nchannel MOSFET current rise during start-up. During softstart, an internal ramp, connected to one of the inverting inputs, raise up to replace the output voltage of error amplifier until the ramp voltage reaches the VCOMP. Current-Limit Protection The APW7207 monitors the inductor current, flowing through the N-channel MOSFET, and limits the current peak at current-limit level to prevent loads and the APW7207 from damages during overload or short-circuit conditions. Over-Temperature Protection (OTP) The over-temperature circuit limits the junction temperature of the APW7207. When the junction temperature exceeds 150 C, a thermal sensor turns off the power MOSFET, allowing the devices to cool. The thermal sensor allows the converters to start a soft-start process and regulate the output voltage again after the junction temperature cools by 40C. The OTP is designed with a 40C hysteresis to lower the average Junction Temperature (TJ) during continuous thermal overload conditions, increasing the lifetime of the device. Enable/Shutdown Driving EN to ground places the APW7207 in shutdown mode. When in shutdown, the internal power MOSFET turns off, all internal circuitry shuts down and the quiescnet supply current reduces to 1A maximum. This pin also could be used as a digital input allowing brightness control using a PWM signal from 100Hz to 100kHz. The 0% duty cycle of PWM signal corresponds to zero LEDs current and 100% corresponds to full one. Open-LED Protection In driving LED applications, the feedback voltage on FB pin falls down if one of the LEDs, in series, is failed. Meanwhile, the converter unceasingly boosts the output voltage like a open-loop operation. Therefore, an overvoltage protection (OVP), monitoring the output voltage via OVP pin, is integrated into the chip to prevent the LX and the output voltages from exceeding their maximum voltage ratings. When the voltage on the OVP pin rises above the OVP threshold (28V typical), the converter stops switching and prevents the output voltage from rising. The converter can work again when the falling OVP voltage falls below the OVP voltage threshold.
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APW7207
Application Information
Input Capacitor Selection The input capacitor (CIN) reduces the ripple of the input current drawn from the input supply and reduces noise injection into the IC. The reflected ripple voltage will be smaller when an input capacitor with larger capacitance is used. For reliable operation, it is recommended to select the capacitor with maximum voltage rating at least 1.2 times of the maximum input voltage. The capacitors should be placed close to the VIN and GND. Inductor Selection Selecting an inductor with low dc resistance reduces conduction losses and achieves high efficiency. The efficiency is moderated whilst using small chip inductor which operates with higher inductor core losses. Therefore, it is necessary to take further consideration while choosing an adequate inductor. Mainly, the inductor value determines the inductor ripple current: larger inductor value results in smaller inductor ripple current and lower conduction losses of the converter. However, larger inductor value generates slower load transient response. A reasonable design rule is to set the ripple current, IL, to be 30% to 50% of the maximum average inductor current, IL(AVG). The inductor value can be obtained as below,
V L IN V OUT VOUT - VIN x x F I IL SW OUT (MAX ) IL (AVG )
2
The peak inductor current is calculated as the following equation: IPEAK = IIN(MAX ) +
IL
1 VIN (VOUT - VIN ) 2 VOUT L FSW
LX D1 IOUT VOUT
VIN
IIN
CIN
N-FET
ISW
ESR COUT
IL ILIM IPEAK IL IIN ISW
ID IOUT
Output Capacitor Selection The current-mode control scheme of the APW7207 allows the usage of tiny ceramic capacitors. The higher capacitor value provides good load transients response. Ceramic capacitors with low ESR values have the lowest output voltage ripple and are recommended. If required, tantalum capacitors may be used as well. The output ripple is the sum of the voltages across the ESR and the ideal output capacitor. GVOUT = GVESR + GVCOUT VCOUT IOUT COUT V - VIN OUT V FSW OUT
where VIN = input voltage VOUT = output voltage FSW = switching frequency in MHz IOUT = maximum output current in amp. b = Efficiency IL /IL(AVG) = inductor ripple current/average current (0.3 to 0.5 typical) To avoid the saturation of the inductor, the inductor should be rated at least for the maximum input current of the converter plus the inductor ripple current. The maximum input current is calculated as below:
IIN(MAX ) = IOUT (MAX ) VOUT VIN
9
VESR IPEAK RESR where IPEAK is the peak inductor current.
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APW7207
Application Information (Cont.)
Output Capacitor Selection (Cont.) For ceramic capacitor application, the output voltage ripple is dominated by the VCOUT. When choosing the input and output ceramic capacitors, the X5R or X7R with their good t e m p e r a t u r e an d v o l t a g e c h a r ac t e r i s t i c s a r e recommended. Diode Selection To achieve high efficiency, a Schottky diode must be used. The current rating of the diode must meet the peak current rating of the converter. Setting the LED Current In figure 1, the converter regulates the voltage on FB pin, connected with the cathod of the lowest LED and the current-sense resistor R1, at 0.2V (typical). Therefore, the current (ILED), flowing via the LEDs and the R1, is calculated by the following equation: ILED = 0.2V/R1
Recommended Inductor Selection
Designator L1 Manufacturer GOTREND Part Number GTSD-53-100 Inductance (H) 10 Max DCR () 0.09 Saturation Current (A) 1.3 Dimensions L x W x H (mm3) 5x5x3
Recommended Capacitor Selection
Designator C1 C1 C2 C2 Manufacturer Murata Murata Murata Murata Part Number GRM188C70J22 5KE20 GRM219C80J10 6KE39 GRM21BR71H10 5KA12 GRM31CR61E10 6KA12 Capacitance (F) 2.2 10 1.0 10 TC Code X7S X6S X7R X5R Rated Voltage (V) 6.3 6.3 50 25 Case size 0603 0805 0805 1206
Recommended Diode Selection
Designator D1 Manufacturer Zowie Part Number MSCD104 Maximum average forward Maximum repetitive peak rectified current (A) reverse voltage (V) 1.0 40 Case size 0805
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APW7207
Application Information (Cont.)
Layout Consideration For all switching power supplies, the layout is an important step in the design; especially at high peak currents and switching frequencies. If the layout is not carefully done, the regulator might show noise problems and duty cycle jitter. 1. The input capacitor should be placed close to the VIN and GND. Connecting the capacitor with VIN and GND pins by short and wide tracks without using any vias for filtering and minimizing the input voltage ripple. 2. The inductor should be placed as close as possible to the LX pin to minimize length of the copper tracks as well as the noise coupling into other circuits. 3. Since the feedback pin and network is a high impedance circuit, the feedback network should be routed away from the inductor. The feedback pin and feedback network should be shielded with a ground plane or track to minimize noise coupling into this circuit. 4. A star ground connection or ground plane minimizes ground shifts and noise is recommended.
Via To OVP L1 To Anode of WLEDs VOUT D1 LX C1 VIN Via To VOUT
C2
From Cathod of WLEDs
R1
VEN
Refer to Fig. 1
Figure 5. Optimize APW7207 Layout
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APW7207
Package Information
TSOT-23-6A
D e
SEE VIEW A
E1 b e1
E
c
A2
A
0.25 GAUGE PLANE SEATING PLANE L VIEW A TSOT-23-6A INCHES MIN. 0.028 0.000 0.028 0.012 0.003 0.106 0.102 0.055 0.037 BSC 0.075 BSC 0.60 8 0.012 0 0.024 8 MAX. 0.039 0.004 0.035 0.020 0.008 0.122 0.118 0.071 MAX. 1.00 0.10 0.90 0.50 0.20 3.10 3.00 1.80
S Y M B O L A A1 A2 b c D E E1 e e1 L 0
MILLIMETERS MIN. 0.70 0.01 0.70 0.30 0.08 2.70 2.60 1.40 0.95 BSC 1.90 BSC 0.30 0
Note : Dimension D and E1 do not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate burrs shall not exceed 10 mil per side.
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A1
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APW7207
Carrier Tape & Reel Dimensions
OD0 P0 P2 P1 A E1 F K0 B SECTION A-A T B0 A0 OD1 B A SECTION B-B
d
Application
A 178.0O .00 2
H 50 MIN. P1 4.0O .10 0
H A
T1
T1 8.4+2.00 -0.00 P2 2.0O .05 0
C 13.0+0.50 -0.20 D0 1.5+0.10 -0.00
d 1.5 MIN. D1 1.0 MIN.
D 20.2 MIN. T 0.6+0.00 -0.40
W 8.0O .30 0 A0 3.20O .20 0
W
E1 1.75O .10 0 B0 3.10O .20 0
F 3.5O .05 0 K0 1.50O .20 0 (mm)
TSOT-23-6A
P0 4.0O .10 0
Devices Per Unit
Package Type TSOT-23-6A Unit Tape & Reel Quantity 3000
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APW7207
Taping Direction Information
TSOT-23-6A
USER DIRECTION OF FEED
AAAX
AAAX
AAAX
AAAX
AAAX
AAAX
AAAX
Classification Profile
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APW7207
Classification Reflow Profiles
Profile Feature Preheat & Soak Temperature min (Tsmin) Temperature max (Tsmax) Time (Tsmin to Tsmax) (ts) Average ramp-up rate (Tsmax to TP) Liquidous temperature (TL) Time at liquidous (tL) Peak package body Temperature (Tp)* Time (tP)** within 5C of the specified classification temperature (Tc) Average ramp-down rate (Tp to Tsmax) Time 25C to peak temperature Sn-Pb Eutectic Assembly 100 C 150 C 60-120 seconds 3 C/second max. 183 C 60-150 seconds See Classification Temp in table 1 20** seconds 6 C/second max. 6 minutes max. Pb-Free Assembly 150 C 200 C 60-120 seconds 3C/second max. 217 C 60-150 seconds See Classification Temp in table 2 30** seconds 6 C/second max. 8 minutes max.
* Tolerance for peak profile Temperature (Tp) is defined as a supplier minimum and a user maximum. ** Tolerance for time at peak profile temperature (tp) is defined as a supplier minimum and a user maximum. Table 1. SnPb Eutectic Process - Classification Temperatures (Tc) Package Thickness <2.5 mm 2.5 mm
3
Volume mm <350 235 C 220 C
3
Volume mm 350 220 C 220 C
3
3
Table 2. Pb-free Process - Classification Temperatures (Tc) Package Thickness <1.6 mm 1.6 mm - 2.5 mm 2.5 mm Volume mm <350 260 C 260 C 250 C Volume mm 350-2000 260 C 250 C 245 C Volume mm >2000 260 C 245 C 245 C
3
Reliability Test Program
Test item SOLDERABILITY HOLT PCT TCT HBM MM Latch-Up Method JESD-22, B102 JESD-22, A108 JESD-22, A102 JESD-22, A104 MIL-STD-883-3015.7 JESD-22, A115 JESD 78 Description 5 Sec, 245C 1000 Hrs, Bias @ 125C 168 Hrs, 100%RH, 2atm, 121C 500 Cycles, -65C~150C VHBMU2KV VMMU200V 10ms, 1trU 100mA
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APW7207
Customer Service
Anpec Electronics Corp. Head Office : No.6, Dusing 1st Road, SBIP, Hsin-Chu, Taiwan, R.O.C. Tel : 886-3-5642000 Fax : 886-3-5642050 Taipei Branch : 2F, No. 11, Lane 218, Sec 2 Jhongsing Rd., Sindian City, Taipei County 23146, Taiwan Tel : 886-2-2910-3838 Fax : 886-2-2917-3838
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