Diodes AP3041 User Manual

Boost Controller for WLED Driver in Medium-sized LCD Panel AP3041

Data Sheet

General Description

The AP3041 is a current mode high voltage low-side channel MOSFET controller, which is ideal for boost regulators. It contains all the features needed to implement single-ended primary topology DC/DC converters.

The input voltage of AP3041 ranges from 5V to 27V. Its operation frequency is adjustable from 100kHz to 1MHz.

The AP3041 has UVLO (Under Voltage Lock Out) circuit. It uses two external resistors to set the UVLO voltage. The AP3041 also has an over output voltage protection to limit the output voltage. The OVP voltage can be set through external resistors. If the output voltage is higher than the OVP high threshold point, it will disable the driver and the system is latched up. The output short circuit protection as well as LED low side short to ground detection function can be applied in system.

The AP3041 has other protection functions, such as LED short protection, LED high side short to ground protection, diode short protection, over current protection, over temperature protection and so on.

The AP3041 is available in SOIC-16 package.

Features

• Input Voltage Range: 5V to 27V

• 1A Peak and 10V MOSFET Gate Driver

• 20ns Quick MOSFET Gate Driver

• Duty Cycle Limit of 90%

• Programmable UVLO

• PWM Dimming Control

• Programmable Over Voltage Protection

• LED Open Protection

• LED Short Circuit Protection

• Diode Short Circuit Protection

• Output Short Circuit Protection

• LED Low-side Short to Ground Detection

• OV Pin Under Voltage Protection

• Over Current Protection

• Programmable Slope Compensation

• Adjustable Soft-start

• Adjustable Protection Delay

• Fault Status Indication

• Adjustable Operation Frequency from 100kHz to

1MHz

• Over Temperature Protection

Applications

• LED Lighting

• LED TV

• LCD Display Modules

SOIC-16

Figure 1. Package Type of AP3041

Oct. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

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Data Sheet

Boost Controller for WLED Driver in Medium-sized LCD Panel AP3041

Pin Configuration

M Package (SOIC-16)

Figure 2. Pin Configuration of AP3041 (Top View)

Oct. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

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p

f

Data Sheet

Boost Controller for WLED Driver in Medium-sized LCD Panel AP3041

Pin Description

Pin Number Pin Name Function

1 CT Capacitor setting shut down delay time

2 OV Over output voltage protection pin

3 UVLO

4 EN Enable pin

5 VIN Input supply pin. This pin must be locally bypassed

6 VCC This pin should be bypassed to GND with a ceramic capacitor

Two resistors connected from this pin to GND and the supply respectively are used to set start-up and shutdown level

ower

7 OUT

8 GND Ground

9 FAULT

10 RT

11 CS

12 SC

13 SS/COMP

14 FB Voltage feedback pin. The reference voltage is 500mV

15 PWM

16 FLAG

Connect this pin to the gate of external MOSFET, the gate driver has 1A peak current capability

This pin can be used to drive the external MOSFET. The logic o the driver signal is controlled by that of phase of them is the same. This pin is pulled to ground under fault condition of OVP, UVLO, OTP, diode short circuit and LED short circuit.

An external resistor connected from this pin to GND is used to set the operating frequency

Sense switch current pin, which is used for current mode control and for current limit. The current limit voltage is 500mV

Slope compensation for current sense. A resistor between SC and GND will program the slope compensation

An external soft-start time capacitor is placed from this pin to

GND and is charged by an internal 20μA current source to control regulator soft-start time. Compensation pin. This pin is the output of the internal error

amplifier.

This pin can be connected to current matched chip and receives error signal used to shut down the system

Fault condition output pin. When the output is in short circuit condition, the FLAG outputs logic low to shut down the power path. Please refer to the application circuit

PWM pin and the signal

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Data Sheet

Boost Controller for WLED Driver in Medium-sized LCD Panel AP3041

Functional Block Diagram

15

10

12

5

OSC

1.25V

10

OVP

10

OTSD

A

CLK

SAW

3V

LOGIC

1

PWM

CLK

OVP

LEB

SCP

R S

EA

Q

OCP

1.75V

SAW

500mV

1.25V

300mV

16

7

DRIVE

8

11

13

14

BANDGAP

4

3

2

9

EN REFERENCE

300mV

1.25V

2.25V

FAULT

VIN VCC

EN

UVLO

OV

PWM

FAULT

RT SC

6

8

GND

FLAG OUT

GND CS

SS/COMP

FB

CT

Figure 3. Functional Block Diagram of AP3041

Oct. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

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Data Sheet

Boost Controller for WLED Driver in Medium-sized LCD Panel AP3041

Ordering Information

AP3041 -

Circuit Type G1: Green

Package

Package M: SOIC-16

Temperature

Range

Part Number Marking ID

Blank: Tube TR: Tape & Reel

Packing

Type

AP3041M-G1 AP3041M-G1 Tube

SOIC-16

-40 to 85°C AP3041MTR-G1 AP3041M-G1 Tape & Reel

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Input Voltage

VCC Pin Voltage

OUT Pin Voltage

FAULT Pin Voltage

FB Pin Voltage

UVLO Pin Voltage

CS Pin Voltage

SC Pin Voltage

FLAG Pin Voltage

SS/COMP Pin Voltage

RT Pin Volt a ge

PWM Pin Voltage

EN Pin Voltage

OV Pin Voltage

Thermal Resistance (Junction to Ambient, No Heat Sink, Free Air)

V

FAULT

V

UVLO

V

FLAG

V

SS/COMP

V

θJA

IN

CC

OUT

FB

CS

SC

RT

PWM

EN

OV

30 V

20 V

7 V

20 V

7 V

30 V

7 V

82 ºC/W

Oct. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

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