AP3029 Features Inherently Uniform Current High Efficiency 83.5%
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AP3029 inductor-based DC/DC converter designed drive white LEDs series rows LEDs with each parallel backlight. Only feedback resistor needed control current obtain required brightness. constant frequency 1.2MHz control scheme employed this which means tiny external components used. fact, tall inductor 0.22µF output capacitor typical application sufficient. Additionally, schottky diode boost circuit integrated this chip. AP3029 also provides disable ease different systems. over output voltage protection equipped AP3029. When broken other abnormal conditions, output voltage will clamped 27V. AP3029 available standard SOT-23-6 TSOT-23-6 packages.
AP3029 Features
Inherently Uniform Current High Efficiency 83.5% Need External Schottky Diode Over Output Voltage Protection Drives LEDs Series Rows LEDs with Each Parallel Fast 1.2MHz Switching Frequency Uses Tiny Tall Inductor Requires Only 0.22µF Output Capacitor
Applications
Cellular Phones Digital Cameras modules Receivers PDAs, Handheld Computers
SOT-23-6
TSOT-23-6
Figure Package Type AP3029
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Configuration
K/KT Package (SOT-23-6/TSOT-23-6)
Marking
AP3029
VOUT CTRL
Figure Configuration AP3029 (Top View)
Description
Number Name CTRL VOUT Switch Pin. Connect external inductor Ground Voltage Feedback. Reference voltage 200mV Shutdown Dimming Pin. Connect 1.8V higher enable device; Connect 50mV less disable device; Connect voltage between 1.8V 50mV achieve linear dimming Output Pin. Connected cathode internal schottky diode Input Supply Pin. Must locally bypassed Function
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Functional Block Diagram
SOFT START
AP3029
VOUT
VREF 1.25
COMPARATOR
DRIVER
CTRL
RAMP GENERATOR
OSCILLATOR
Figure Functional Block Diagram AP3029
Ordering Information
AP3029 Circuit Type Package SOT-23-6 TSOT-23-6
Part Number Lead Free
AP3029KTR-E1 AP3029KTTR-E1
Lead Free Green Tape Reel
Package
SOT-23-6 TSOT-23-6
Temperature Range
85oC
Marking Lead Free Green
Green
AP3029KTR-G1 AP3029KTTR-G1
Packing Type Tape Reel Tape Reel
Semiconductor's Pb-free products, designated with "E1" suffix part number, RoHS compliant. Products with "G1" suffix available green packages.
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Absolute Maximum Ratings (Note
Parameter Input Voltage Voltage Voltage CTRL Voltage Thermal Resistance (Junction Atmosphere, Heat sink) Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10sec) (Machine Model) (Human Body Model) TSTG TLEAD Symbol Value 2000 Unit
oC/W
AP3029
Note Stresses greater than those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated under "Recommended Operating Conditions" implied. Exposure "Absolute Maximum Ratings" extended periods affect device reliability.
Recommended Operating Conditions
Parameter Operating Temperature Range Input Voltage CTRL Voltage Symbol VCTRL Unit
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Electrical Characteristics
(VIN=3V, VCTRL =3V, TA=25oC, unless otherwise specified.)
Parameter Minimum Operating Voltage Maximum Operating Voltage Feedback Voltage Bias Current Supply Current Shutdown Quiescent Current Switching Frequency Maximum Duty Cycle Switch Current Limit (Note Switch Saturation Voltage Switch Leakage Current CTRL Voltage VCTRL Symbol VIN(min) VIN(max) DMAX ILIMIT VCESAT TA=25oC, D=40% TA=25oC, D=80% ISW=250mA VSW=5V High CTRL Bias Current ICTRL TA=85oC TA=-40oC Schottky Forward Drop Schottky Leakage Current Soft Start Time VDROP ID=150mA Reverse Voltage VR=23V Reverse Voltage VR=27V 0.05 VFB=VIN, Switching VCTRL=0V IOUT=20mA, LEDs, TA=-40oC 85oC 0.01 Conditions Unit
AP3029
Note Switch Current Limit related Duty Cycle. Please refer Figure detail.
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Typical Performance Characteristics
WLED 3.45V IF=20mA, unless otherwise noted
AP3029
Efficiency
VIN=3.6V, IOUT=20mA, LEDs CIN=1µF, COUT=0.22µF, L=22µH
Efficiency
IOUT=20mA, LEDs, TA=25 CIN=1µF, COUT=0.22µF, L=22µH
Junction Temperature
Input Voltage
Figure Efficiency Junction Temperature
Figure Efficiency Input Voltage
Schottky Forward Current (mA)
Efficiency
VIN=3.6V, IOUT=20mA, TA=25 CIN=1µF, COUT=0.22µF, L=22µH
1000
LEDs (PCS)
Schottky Forward Drop (mV)
Figure Efficiency LED's Number
Figure Schottky Forward Current Schottky Forward Drop
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Typical Performance Characteristics (Continued)
WLED 3.45V IF=20mA, unless otherwise noted
AP3029
Quiescent Current (µA)
Supply Current (mA)
Input Voltage
Input Voltage
Figure Shutdown Quiescent Current Input Voltage
Figure Supply Current Input Voltage
29.0 28.5 27.5 27.0 26.5 26.0 25.5 25.0
Output Clamp Voltage
28.0
Input Current (mA)
Input Voltage
Input Voltage
Figure Output Clamp Voltage Input Voltage
Figure Input Current Output Open Circuit Input Voltage
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Typical Performance Characteristics (Continued)
WLED 3.45V IF=20mA, unless otherwise noted
AP3029
1.40 1.35 1.30
Feedback Voltage (mV)
1.25
Frequency (MHz)
1.20 1.15 1.10 1.05 1.00 0.95 0.90
Junction Temperature
Junction Temperature
Figure Switching Frequency Junction Temperature
Figure Feedback Voltage Junction Temperature
0.80 0.78 0.76
0.50 0.45 0.40
Schottky Forward Drop
0.74 0.72 0.70 0.68 0.66 0.64 0.62 0.60
Schottky Leakage Current (µA)
VR=10V VR=16V VR=23V
0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00
Junction Temperature
Junction Temperature
Figure Schottky Forward Drop Junction Temperature
Figure Schottky Leakage Current Junction Temperature
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Typical Performance Characteristics (Continued)
WLED 3.45V IF=20mA, unless otherwise noted
AP3029
Saturation Voltage (mV)
Current Limit (mA)
Switch Current (mA)
Duty Cycle
Figure Switch Current Limit Duty Cycle
Figure Switch Saturation Voltage Switch Current
Feedback Voltage (mV)
CTRL Voltage
Figure Feedback Voltage CTRL Voltage
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Application Information
Operation
AP3029 boost DC-DC converter which uses constant frequency, current mode control scheme provide excellent line load regulation. Operation best understood referring Figure start each oscillator cycle, latch switch turns switch current will increase linearly. voltage sense resistor proportional switch current. output current sense amplifier added stabilizing ramp result into non-inversion input comparator When this voltage exceeds output voltage level error amplifier latch reset switch turned off. clear that voltage level inversion input sets peak current level keep output regulation. This voltage level output signal error amplifier amplified signal voltage difference between feedback voltage reference voltage 200mV. constant output current provided this operation mode.
AP3029
200mV
Over Voltage Protection
AP3029 internal open-circuit protection circuit. When LEDs disconnected from circuit fail open, output voltage clamped 27V. AP3029 will switch frequency, minimize input current.
Soft Start
AP3029 internal soft start circuit limit inrush current during startup. time startup controlled internal soft start capacitor. Please refer Figure
100mA/div VOUT 5V/div
100mV/div
VCTRL 2V/div Time 100µs/div
Control Signal
VOUT
AP3029
CTRL
Figure Soft Start Waveform VIN=3.6V, LEDs, ILED=20mA
Dimming Control
Figure Typical Application circuit Decide
Current Control
Refer Figure current controlled feedback resistor LEDs' current accuracy determined regulator's feedback threshold accuracy independent LED's forward voltage variation. precise resistors preferred. resistance inverse proportion current since feedback reference fixed 200mV. relation current expressed below: Aug. 2008 Rev.
typical types dimming control circuit present below. First, controlling CTRL voltage change operation state good choice. Second, changing feedback voltage appropriate duty luminous intensity also useful. (1). Adding Control Signal CTRL There three methods control CTRL signal First, adding Signal CTRL directly. AP3029 turned signal when applied CTRL pin. typical frequency
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Application Information (Continued)
this signal 2KHz. Please refer Figure
AP3029
First, adding constant voltage through resistor divider control dimming. Changing voltage resistor between voltage appropriate luminous intensity. Comparing with kinds signal control, this method features stable output voltage LEDs current. Please refer Figure
AP3029
CTRL
2kHz
Figure Dimming Control Using Signal CTRL
Secondly, adding constant voltage through resistor divider CTRL control dimming. voltage indirectly adjusted when CTRL voltage between 50mV 1.8V, which used dimming control. Please refer Figure
AP3029
Effective Feedback Voltage
AP3029
CTRL
Figure Dimming Control Using Voltage
Second, using filtered signal filtered signal considered varying adjustable voltage.
Figure Dimming Control Using Voltage CTRL
Thirdly, using filtered signal adding CTRL achieve dimming control. filtered signal considered adjustable voltage. will change voltage indirectly achieve dimming control. circuit shown Figure
AP3029
0.1µF
Effective Feedback Voltage
Signal
100nF
AP3029
CTRL
Figure Dimming Control Using Filtered Voltage
Figure Dimming Control Using Filtered Signal Voltage CTRL
Third, using logic signal change feedback voltage. example, connected through mosFET resistor. this mosFET controlled logic signal. luminous intensity LEDs will changed when mosFET turns off.
(2). Changing Effective Feedback Voltage There three methods change effective feedback voltage. Aug. 2008 Rev. Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Application Information (Continued)
AP3029
Logic Signal 2N7002 Effective Feedback Voltage
AP3029
Figure Dimming Control Using Logic Signal
Typical Application
Control Signal CTRL
VOUT 0.22µF
AP3029
Dielectric SUMIDA CDRH5D28R-100NC Equivalent This circuit work full temperature
Four White LEDs Driver
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Typical Application (Continued)
AP3029
Control Signal
CTRL
VOUT 0.22µF
AP3029
Dielectric SUMIDA CDRH5D28R-220NC Equivalent This circuit work full temperature
White LEDs Driver
Control Signal
CTRL
VOUT 0.22µF
AP3029
Dielectric SUMIDA CDRH5D28R-220NC Equivalent transistors recommended Dual Matched transistor pairs This circuit work full temperature
White LEDs Driver Figure Typical Application Drivers
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Mechanical Dimensions SOT-23-6 Unit: mm(inch) AP3029
2.820(0.111) 3.020(0.119) 0.300(0.012) 0.400(0.016) 0.300(0.012) 0.600(0.024)
0.200(0.008)
2.650(0.104) 2.950(0.116)
Marking
0.700(0.028)REF
0.950(0.037)TYP 1.800(0.071) 2.000(0.079) 0.000(0.000) 0.100(0.004) 0.100(0.004) 0.200(0.008)
1.050(0.041) 1.050(0.041) 1.150(0.045) 1.250(0.049)
Aug. 2008 Rev.
1.500(0.059) 1.700(0.067)
Semiconductor Manufacturing Limited
Preliminary Datasheet WHITE STEP-UP CONVERTER Mechanical Dimensions TSOT-23-6 Unit: mm(inch) AP3029
2.800(0.110) 3.000(0.118)
R0.100(0.004)
1.500(0.059) 1.700(0.067)
Marking
2.600(0.102) 3.000(0.118)
0.370(0.015)
0.950(0.037) 1.900(0.075) GAUGE PLANE
0.100(0.004) 0.250(0.010)
0.250(0.010)
0.700(0.028) 0.800(0.031)
0.700(0.030) 0.900(0.035)
0.000(0.000) 0.100(0.004)
0.350(0.014) 0.510(0.020)
Aug. 2008 Rev.
Semiconductor Manufacturing Limited
Semiconductor Manufacturing Limited
http://www.bcdsemi.com
IMPORTANT NOTICE Semiconductor Manufacturing Limited reserves right make changes without further notice products specifications herein. Semiconductor Manufacturing Limited does assume responsibility products particular purpose, does Semiconductor Manufacturing Limited assume liability arising application products circuits. Semiconductor Manufacturing Limited does convey license under patent rights other rights rights others.
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