AP5727

BIAS POWER SUPPLY FOR OLED

SUB DISPLAY AND TFT-LED

AP5727

Document number: DS31887 Rev. 2 - 2

2 of 10

www.diodes.com

January 2011

© Diodes Incorporated

Functional Block Diagram

1.2MHz

Oscillator

RAMP

Generator

Σ

-

+

V

REF

1.25V

V

IN

3

FB

R

C

C

C

Comparator

A2

R

S

Q

A1

1

Driver

SW

Q1

2 GND

4

EN

Shutdown

5

Figure 2. Block Diagram

Pin Descriptions

Name

Description

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 1.25V.

EN

Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns it off. When not

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

Input Supply Pin. Must be locally decoupled - 4.7

μF recommended to reduce input noise.