Owner manual

ManualsBrandsDiodes ManualsHardwareAP3036/A

Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

General Description

The AP3036/A is an inductor-based DC/DC

converter designed to drive up to eight white LEDs in

series for backlight. Only one feedback resistor is

needed to control the LED current and obtain

required brightness.

A constant frequency 1.0MHz PWM control scheme

is employed in this IC, which means tiny external

components can be used. Specifically, 1mm tall

inductor and 0.22µF output capacitor for a typical

application is sufficient. Additionally, the Schottky

diode in boost circuit is integrated on this chip. The

AP3036/A also provides a disable pin to ease its use

for different systems.

The output over-voltage protection is implemented in

AP3036/A. When any LED is broken or in other

abnormal conditions, the output voltage will be

clamped.

The AP3036/A is available in standard SOT-23-6 and

TSOT-23-6 packages.

Features

•

Inherently Uniform LED Current

• High Efficiency up to 84%

• No Need for External Schottky Diode

• Output Over-voltage Protection (OVP)

• Fixed 1.0MHz Switching Frequency

• Uses Tiny 1mm Tall Inductor

• Requires Only 0.22µF Output Capacitor

• High Frequency Dimming Control

Applications

• Cellular Phones

• Digital Cameras

• LCD Modules

• GPS Receivers

• PDAs, Handheld Computers

Figure 1. Package Types of AP3036/A

SOT-23-6 TSOT-23-6

Summary of content (14 pages)

PAGE 1
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A General Description Features The AP3036/A is an inductor-based DC/DC converter designed to drive up to eight white LEDs in series for backlight. Only one feedback resistor is needed to control the LED current and obtain required brightness. • • • • • • • • A constant frequency 1.0MHz PWM control scheme is employed in this IC, which means tiny external components can be used. Specifically, 1mm tall inductor and 0.
PAGE 2
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Pin Configuration K/KT Package (SOT-23-6/TSOT-23-6) Pin 1 Dot by Marking SW 1 6 VIN GND 2 5 VOUT FB 3 4 CTRL Figure 2. Pin Configuration of AP3036/A (Top View) Pin Description Pin Number Pin Name 1 SW 2 GND 3 FB Voltage feedback pin. The reference voltage is 200mV for AP3036 and 250mV for AP3036A 4 CTRL Shutdown and dimming pin. Connect to 1.8V or higher to enable device; Connect to 0.
PAGE 3
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Functional Block Diagram Figure 3.
PAGE 4
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Voltage VIN 20 V SW Pin Voltage VSW 38 V Feedback Voltage VFB 20 V VCTRL 20 V θJA 265 °C/W TJ 150 °C Storage Temperature Range TSTG -65 to 150 °C Lead Temperature (Soldering, 10sec) TLEAD 260 °C ESD (Machine Model) 250 V ESD (Human Body Model) 2000 V CTRL Pin Voltage Thermal Resistance (Junction Ambient, No Heat Sink) Operating Junction Tempe
PAGE 5
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Electrical Characteristics VIN =3V, VCTRL=3V, TA=25°C, unless otherwise specified. Parameter Symbol Minimum Operating Voltage VIN (Min) Maximum Operating Voltage VIN (Max) Conditions Min Typ Max Unit 2.
PAGE 6
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Performance Characteristics The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted. 90 88 1600 VIN=3.6V Schottky Forward Voltage (mV) IOUT=20mA 86 Efficiency (%) 84 82 80 78 76 74 1200 800 400 0 72 2 3 4 5 6 7 8 0 LED Numbers 200 300 400 500 Schottky Forward Current (mA) Figure 4. Efficiency vs. LED’s Number Figure 5. Schottky Forward Voltage vs. Schottky Forward Current 3.
PAGE 7
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Performance Characteristics (Continued) The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted. 300 250 Current Limit (mA) Feedback Voltage (mV) 600 200 150 VIN=3.6V 500 400 VIN=3.6V, 5 LEDs AP3036 AP3036A 300 100 -40 0 40 80 120 160 -40 0 40 80 120 160 O O Temperature ( C) Temperature ( C) Figure 8. Feedback Voltage vs. Temperature Figure 9. Current Limit vs. Temperature 800 700 VIN=3.
PAGE 8
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Performance Characteristics (Continued) The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted. 36 Operating Frequency (MHz) 32 OVP Voltage (V) VIN=3.6V 1.2 VIN=VCRTL=3.6V 28 24 5 LEDs 1.0 0.8 20 0.6 -40 0 40 80 120 -40 160 0 O 40 80 120 160 O Temperature ( C) Temperature ( C) Figure 12. OVP Voltage vs. Temperature Figure 13. Operating Frequency vs. Temperature 90 88 VIN=3.
PAGE 9
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Performance Characteristics (Continued) The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted. 30 30 VIN=3.6V, 5 LEDs 25 VIN=3.6V, 5 LEDs 25 PWM Frequency=100KHz LED Current (mA) LED Current (mA) PWM Frequency=0.5kHz 20 15 10 20 15 10 5 5 0 0 0 0 20 40 60 80 20 40 60 80 100 Duty (%) 100 Duty (%) Figure 16. LED Current vs. Duty Figure 17. LED Current vs.
PAGE 10
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Performance Characteristics (Continued) The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted. VIN 2V/div VIN 2V/div VSW 10V/div VSW 10V/div VOUT1(AC) 100mV/div VOUT 10V/div IL 100mA/div ILED 10mA/div Time 1µs/div Figure 20. Output Voltage Ripple (VIN=VCTRL=3.6V, ILED=20mA, 5 LEDs) Jul. 2012 Time 10µs/div Figure 21. PWM Dimming (VIN=3.6V, VPWM=2.5V, fPWM=100kHz, Duty=50%, 5 LEDs) Rev. 1.3.
PAGE 11
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Application Figure 22. Typical Application of AP3036/A (Note 3) Note 3: C: X5R or X7R type dielectric, L: SUMIDA CDRH5D28R-220NC or equivalent. And, this circuit can work in full temperature. Jul. 2012 Rev. 1.3.
PAGE 12
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Mechanical Dimensions SOT-23-6 Unit: mm(inch) 0° 2.820(0.111) 8° 3.020(0.119) 0.300(0.012) 0.400(0.016) 6 0.200(0.008) 5 0.300(0.012) 0.600(0.024) 4 Pin 1 Dot by Marking 1 2 3 0.700(0.028)REF 0.950(0.037)TYP 0.000(0.000) 0.150(0.006) 1.800(0.071) 2.000(0.079) 0.100(0.004) 0.200(0.008) 0.900(0.035) 1.450(0.057) MAX 1.300(0.051) Jul. 2012 Rev. 1.3.
PAGE 13
Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Mechanical Dimensions (Continued) TSOT-23-6 2.800(0.110) 3.000(0.118) 1.500(0.059) 1.700(0.067) Unit: mm(inch) R0.100(0.004) MIN 0° 8° 2.600(0.102) 3.000(0.118) Pin 1 Dot by Marking 0.370(0.015) MIN 0.950(0.037) BSC 0.100(0.004) 0.250(0.010) 1.900(0.075) BSC 0.250(0.010) BSC GAUGE PLANE 0.700(0.028) 0.900(0.035) 1.000(0.039) MAX 0.000(0.000) 0.100(0.004) Jul. 2012 0.350(0.014) 0.510(0.020) Rev. 1.3.
PAGE 14
BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein.