30V, 1.2MHz, White Driver Features Wide Input Voltage Range from

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APW7128
30V, 1.2MHz, White Driver Features
Wide Input Voltage Range from 2.7V High Current-Limit 3.5A 0.5V Reference Voltage with System Accuracy Integrated N-FET Fixed 1.2MHz Switching Frequency High Efficiency Open-LED Protection Under Voltage Lockout Protection Control Input Over Temperature Protection Shutdown Current: <1uA DFN-10 Package Lead Free Green Devices Available (RoHS Compliant)
General Description
APW7128 high power high efficiency boost converter with integrated ideal panel backlighting applications. output voltage allows high-power LEDs series, 3.5A inductor current limit allows more strings connected parallel. 0.5V feedback voltage offers higher efficiency WLED driver applications. wide input range from 2.7V made APW7128 perfect solution various applications such monitor portable devices. monitors output voltage protect during open load short circuit operations. APW7128 provides simplify interface ambient light sensor automatic dimming. APW7128 available thermally enhanced DFN-10 lead package.
Configuration
Metal (Bottom)
Applications
Display Backlighting Automotive Monitors Notebook Displays Portable Displays
COMP PGND
APW7128 DFN3x3-10 View
Ordering Marking Information
APW7128 Assembly Material Handling Code Temperature Range Package Code
7128 XXXXX
Package Code DFN3x3-10 Operating Ambient Temperature Range Handling Code Tape Reel Assembly Material Lead Free Device Halogen Lead Free Device XXXXX Date Code
APW7128
Note: ANPEC lead-free products contain molding compounds/die attach materials 100% matte plate termination finish; which fully compliant with RoHS. ANPEC lead-free products meet exceed lead-free requirements IPC/JEDEC J-STD-020C classification lead-free peak reflow temperature. ANPEC defines "Green" mean lead-free (RoHS compliant) halogen free does exceed 900ppm weight homogeneous material total does exceed 1500ppm weight). ANPEC reserves right make changes improve reliability manufacturability without notice, advise customers obtain latest version relevant information verify before placing orders. Copyright ANPEC Electronics Corp. Rev. Apr., 2008 www.anpec.com.tw
APW7128
Absolute Maximum Ratings
Symbol VOVP VALS TSTG PGND PGND Maximum Junction Temperature Storage Temperature Range Maximum Lead Soldering Temperature, Seconds
(Note
Rating -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 -0.3 Unit
Parameter
Note Stresses beyond absolute maximum rating damage device exposure absolute maximum rating conditions extended periods affect device reliability.
Thermal Characteristics (Note
Symbol Parameter Junction Ambient Thermal Resistance Free Package DFN3x3-10 Typical Value Unit °C/W
Note measured with component mounted high effective thermal conductivity test board free air. exposed soldered directly PCB.
Recommended Operating Conditions
Symbol VOUT Parameter Supply Voltage, (VIN=BP) Supply Voltage, open) Output Voltage Operating Ambient Temperature Operating Junction Temperature Rating Unit
Electrical Characteristics
VIN=6V, 85°C, unless otherwise specified. Typical values refer =25°C. Symbol Parameter Under Voltage Lockout Threshold UVLO Hysteresis IVIN Supply Current EN=5V, switching EN=0V Test Conditions Unit
INPUT SUPPLY CURRENT UVLO rising
ERROR AMPLIFIER ICOMP Error Amplifier Transconductance COMP Output Current Voltage sourcing sinking, VCOMP=1.5V uA/V
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Electrical Characteristics (Cont.)
VIN=6V, 85°C, unless otherwise specified. Typical values refer =25°C. Symbol Parameter Minimum Voltage Input Bias Current Line Regulation INTERNAL POWER SWITCH Power Switch Current-Limit RDS(ON) Power Switch Resistance Leakage Current DMAX Ratio Leakage OUTPUT OVERVOLTAGE PROTECTION Over Voltage Threshold Hysteresis Leakage Current CONTROL LOGIC High-Level Input Voltage Low-Level Input Voltage Leakage Current THERMAL SHUTDOWN Thermal Shutdown Threshold Thermal Shutdown Hysteresis
Test Conditions VALS=0.3V
0.02
0.04
Unit
VIN=2.7V
VLX=30V
Switching Frequency Maximum Duty Cycle
VALS=1V, VALS/VFB VALS=5V
VEN=21V
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Typical Operating Characteristics
Supply Current Supply Voltage
Supply Current Supply Voltage
switching
Supply Current (mA)
switching
Supply Current (uA)
Supply Voltage
Supply Voltage
Efficiency Load Current
Voltage Supply Voltage
0.510
Efficiency
VIN=6V
Voltage
8LEDs series
VIN=12V
VIN=19V
0.505
0.500
0.495
0.490
Load Current
Voltage Input Voltage
0.55 0.50
Supply Voltage
Threshold Voltage Supply Voltage
Voltage
0.45 0.40 0.35 0.30 0.25 0.20 0.15
Threshold Voltage
High Threshold
Threshold
Input Voltage
Supply Voltage
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Typical Operating Characteristics (Cont.)
Power Switching Resistance Supply Voltage
Switching Frequency Supply Voltage
1.40
Power Switch Resistance
Switching Frequency (MHz)
1.35
1.30
1.25
1.20
Supply Voltage
Switching Frequency Junction Temperature
1.50 1.45
Supply Voltage
Supply Current Junction Temperature
Switching Frequency (MHz)
switching
1.40 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00
Supply Current (uA)
Junction Temperature (oC)
Power Switching Resistance Junction Temperature
0.510 0.508
Junction Temperature (oC)
Voltage Junction Temperature
Power Switch Resistance
0.506
Voltage
0.504 0.502 0.500 0.498 0.496
0.494 0.492
0.490
Junction Temperature
Junction Temperature (oC)
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Operating Waveforms
Refer typical application circuit. test condition VIN=5V, 25oC unless otherwise specified.
Start-up
Shutdown
VOUT
VOUT
VIN=12V, L=10uH, CCOMP=0.22uF CH1: VEN, 10V/div, CH2: VOUT, 10V/div, CH4: IIN, 500mA/div, TIME: 1ms/div
VIN=12V, L=10uH, CCOMP=0.22uF CH1: VEN, 10V/div, CH2: VOUT, 10V/div, CH4: IIN, 500mA/div, TIME: 10ms/div
Overvoltage Protection
Switching Waveforms
VCOMP
VOUT
Output open CH1: VCOMP, 0.5V/div, CH2: VOUT, 10V/div, CH4: IIN, 100mA/div, TIME: 10ms/div
VIN=12V, L=10uF, IOUT=160mA CH1: VIN, 50mV/div, CH2: VOUT, 200mV/div, CH3: VLX, 20V/div, CH4: 200mA/div, TIME: 0.5us/div
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Description
NAME COMP PGND FUNCTION Regulator Feedback Pin. Connect current sense resistor current. Error Amplifier Output. Connect 0.22µF capacitor compensation soft-start. When pulled low, internal switch will discharge COMP voltage Output Over Voltage Monitor Pin. VOUT function. Enable Input Pin. Pull above 2.4V enable device; pull below 0.4V disable device. cannot left floating. Power Ground. Source internal N-channel power MOSFET. Internal Power MOSFET Drain. Supply Voltage Input. Output Internal Regulator. Connect bypass capacitor GND. apply external load Signal Ground. Ambient Light Sensor Input. Allow light sensor control voltage dimming. function used, pin.
Block Diagram
UVLO 0.9V
Control Logic Thermal Shutdown
Oscillator PGND COMP 0.5V
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Typical Application Circuit
10uH
Strings
10uF brightness control COMP PGND VADJ
LEDs String 0.22uF
APW7128
120k
0.1uF
LED(max)=20mA 3.75 ILED(min)=0mA
Figure1. Analog Dimming with Voltage
10uF
10uH
Strings
COMP PGND
LEDs String 0.22uF
APW7128
3.125
Figure2. Analog Dimming with External Voltage
Designation
Supplier GOTREND Murata Murata Murata Murata Zowie
Part Number GTSD53 GRM31CR61E106K GRM155R61A105K GRM155R60J224KE01 GRM21BR71H105KA12 MSCD104
Specification 10uH, 1.33A X5R, 25V, 10uF X5R, 10V, X5R, 6.3V. 0.22uF X7R, 50V, 1.0A,
Wedsite www.gotrend.com.tw www.murata.com www.murata.com www.murata.com www.murata.com www.zowie.com.tw
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Function Description
Output Overvoltage Protection shorted ground fails open circuit, output voltage BOOST mode increase potentially damaging voltages. optional overvoltage protection circuit enabled connection output voltage. device will stop switching output voltage exceeds high threshold re-start when output voltage falls below threshold. During sustained fault conditions, VOUT will saw-tooth between upper lower threshold voltages frequency determined magnitude current available discharge output capacitor. Note that must connected output voltage function. Ambient Light Sensor Interface APW7128 provides simplify interface ambient light sensor. ambient light sensor detects ambient light yields current which related illuminance. Connect load resistor from current output ambient light sensor ground provide output voltage pin. voltage will divided internal divider circuit, divided voltage will replace internal reference voltage. current calculated following equation:
internal thermal sensor circuit will disable device allow device cool down. When device' junction temperature cools 50°C, internal thermal sense circuit will enable device, resulting pulsed output during continuous thermal protection. Thermal protection designed protect event over temperature conditions. normal operation, junction temperature cannot exceed TJ=+125 Internal APW7128 provides internal control circuitry, output internal pin. normal operation, connect greater capacitor recommended. internal cannot supply more current than required operate APW7128. Therefore, apply external load pin. applications, where less than 5.5V, should tied through resistor.
Note that maximum voltage 0.5V, minimum voltage 0.2V. divided voltage over 0.5V less 0.2V, current limited
ILED (MAX
ILED (MIN
where resistor from GND. Enable/Disable Pull above enable device pull below 0.4V disable device. shutdown mode, internal control circuits turned off, quiescent current below 1uA. Thermal Shutdown When junction temperature exceeds 150°C,
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Application Information
Connecting more strings APW7128 drive strings parallel LEDs string (VF<3.5V). Each string must have same number LEDs. applications that have same total number LEDs, more strings less LEDs series more efficiency than less strings more LEDs series. Brightness Control method dimming LEDs apply voltage through filter into pin. filter used convert voltage into analog voltage. values depend upon frequency voltage amount allowable ripple voltage pin. current proportional duty cycle. duty delivers maximum current 100% duty delivers minimum current. values calculated following equations:
(ILED(max) VADJ(low) ILED(min) VADJ(high)) VADJ(high) ILED(max) ILED(min) VADJ(low) ILED(min) ILED(max)
Inductor Selection larger value inductor will reduce peak inductor current, resulting smaller input ripple current, higher efficiency reducing stress internal MOSFET. However, larger value inductor large dimension, lower saturation current, higher series resistance. good rule determining inductance allow peak-to-peak ripple current approximately maximum input current. Calculate required inductance value equation:
(30% 50%)
necessary choose inductor that ensures inductor saturation current rating exceed peak inductor current application. make sure that peak inductor current below current-limit 2.5A. Calculating peak inductor current following equation: IPEAK
(max)
where: ILED(max) maximum current ILED(min) minimum current VADJ(high) maximum voltage level VADJ(min) minimum voltage level Voltage
IPEAK
where
VOUT ILOAD VOUT VIN) VOUT
efficiency
Schottky Diode Selection
APW7128 VADJ(max) Voltage VADJ(min)
fast recovery time forward voltage Schottky diode necessary optimum efficiency. Ensure that diode' average peak current rating exceed avers output current peak inductor current. addition, diode' reverse voltage must exceed output voltage.
Figure Dimming with Voltage
Copyright ANPEC Electronics Corp. Rev. Apr., 2008 www.anpec.com.tw
APW7128
Application Information (Cont.)
Capacitor Selection input capacitor required supply ripple current inductor stabilize input voltage. Larger input capacitor values lower provide smaller input voltage ripple noise. typical value input capacitor 2.2µF 10µF. output capacitor with typical value 10µF required maintain output voltage. COMP capacitor with typical value 0.22µF stabilizes converter controls soft-start. ensure voltage rating input output capacitors greater than maximum input output voltage. recommended using ceramic capacitors with X5R, X7R, better dielectrics stable operation over entire operating temperature range. Layout Consideration correct layout important switching converters. layout carefully done, regulator could show stability problems well problems. Figure. illustrates layout guidelines; bold lines indicate these traces that must short wide. capacitors, diode, inductor should close possible. Keep traces short, direct, wide. Keep node away from COMP pins. trace from diode LEDs longer. ground return input capacitor output capacitor should tied close PGND. different ground planes signal ground power ground minimize effects ground noise. Connect these ground nodes place close ground pins resistor from should close possible. metal plate bottom must soldered connected node plane backside through several thermal vias improve heat dissipation.
COMP BOTTOM SIDE
connection PGND plane connection plane connection plane Short wide wires Short wires
Figure Layouy Guidelines
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Package Information
DFN3x3-10
DFN3*3-10 MILLIMETERS MIN. 0.80 0.00 0.20 0.18 3.00 2.20 3.00 1.40 0.50 0.30 0.50 0.012 1.75 0.055 0.016 0.020 2.70 0.087 0.118 0.069 0.30 0.007 0.118 0.106 MAX. 1.00 0.05 MIN. 0.031 0.000 0.008 0.012 INCHES MAX. 0.039 0.002
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
Corner
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APW7128
Carrier Tape Reel Dimensions
SECTION SECTION
Application
5.5± 0.05
178.0± 2.00 MIN. DFN3x3-10 4.0± 0.10 8.0± 0.10
12.4+2.00 13.0+0.50 MIN. -0.00 -0.20 2.0± 0.10 1.5+0.10 -0.00 MIN.
20.2 MIN. 12.0± 0.30 1.75± 0.10
0.6+0.00 0.20 3.35± 0.20 1.30± 0.20 -0.40 3.35± (mm)
Devices Unit
Package Type DFN3X3-10 Unit Tape Reel Quantity 3000
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Reflow Condition (IR/Convection Reflow)
Critical Zone Ramp-up
Temperature
Tsmax
Tsmin Ramp-down Preheat
25°C Peak
Time
Classification Reflow Profiles
Profile Feature Average ramp-up rate Preheat Temperature (Tsmin) Temperature (Tsmax) Time (min max) (ts) Time maintained above: Temperature (TL) Time (tL) Peak/Classification Temperature (Tp) Time within actual Peak Temperature (tp) Ramp-down Rate Time 25°C Peak Temperature Sn-Pb Eutectic Assembly 3°C/second max. 100°C 150°C 60-120 seconds 183°C 60-150 seconds table 10-30 seconds 6°C/second max. minutes max. Pb-Free Assembly 3°C/second max. 150°C 200°C 60-180 seconds 217°C 60-150 seconds table 20-40 seconds 6°C/second max. minutes max.
Notes: temperatures refer topside package. Measured body surface.
Copyright ANPEC Electronics Corp. Rev. Apr., 2008
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APW7128
Classification Reflow Profiles (Cont.)
Table SnPb Entectic Process Package Peak Reflow Temperatures Package Thickness <2.5 Volume <350 +0/-5°C +0/-5°C
Volume +0/-5°C +0/-5°C
Table Pb-free Process Package Classification Reflow Temperatures Volume Volume Volume <350 350-2000 >2000 <1.6 +0°C* +0°C* +0°C* +0°C* +0°C* +0°C* +0°C* +0°C* +0°C* Tolerance: device manufacturer/supplier shall assure process compatibility including stated classification temperature (this means Peak reflow temperature +0°C. example 260°C+0°C) rated level. Package Thickness
Reliability Test Program
Test item SOLDERABILITY HOLT Latch-Up Method MIL-STD-883D-2003 MIL-STD-883D-1005.7 JESD-22-B,A102 MIL-STD-883D-1011.9 MIL-STD-883D-3015.7 JESD Description 245°C, 1000 Bias @125°C Hrs, 100%RH, 121°C -65°C~150°C, Cycles VHBM 2KV, 200V 10ms, 100mA
Customer Service
Anpec Electronics Corp. Head Office No.6, Dusing Road, SBIP, Hsin-Chu, Taiwan, R.O.C. 886-3-5642000 886-3-5642050 Taipei Branch Lane 218, Jhongsing Rd., Sindian City, Taipei County 23146, Taiwan 886-2-2910-3838 886-2-2917-3838
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30V, 1.2MHz, White Driver Features Wide Input Voltage Range from

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