AP5724

Document number: DS31843 Rev. 4 - 2

2 of 15

www.diodes.com

December 2013

© Diodes Incorporated

AP5724

Pin Descriptions

Pin Name

Functions

SW

Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.

GND

GND pin.

FB

Feedback Pin. Reference voltage is 0.1V. Connect cathode of lowest LED and a sense resister here. Calculate resistor value

EN

Converter On/Off Control Input. A high input at EN turns the converter On, and a low input turns it off. If On/Off control is not

needed, connect EN to the input source for automatic startup. The EN pin cannot be left floating.

OVP

Output Voltage detect pin for over voltage protection.

Input Supply Pin. Must be locally bypassed with 1

μF or 2.2μF to reduce input noise.

Functional Block Diagram

1.2MHz

Oscillator

RAMP

Generator

Σ

-

+

0.1V

VIN

3

FB

Rc

Cc

Comparator

A2

CONTROL

LOGIC

A1

1

Driver

SW

Q1

2 GND

4

EN

Enable

6

OTP

5

OVP

Symbol

Parameter

Rating

Unit

VIN Pin Voltage

-0.3 to +7

V

VSW

SW Voltage

-0.3 to +34

V

OVP Pin Voltage

-0.3 to +35

V

Feedback Pin Voltage

-0.3 to +7

V

EN

EN

-0.3 to +7

V

Maximum Junction Temperature

150

°C

Lead Temperature

300

°C

Storage Temperature Range

-65 to +150

°C

Caution:

Operation above the absolute maximum ratings can cause device failure. These values, therefore, must not be exceeded under any condition.

Operation at the absolute maximum rating for extended periods, may reduce device reliability.