AP3776B

Document number: DS36737 Rev. 6 - 2

1 of 17

www.diodes.com

December 2015

© Diodes Incorporated

AP3776B

LOW POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER

Description

The AP3776B is a high performance AC/DC power supply controller

for battery charger and adapter applications. It can meet less than

10mW standby power for

“Super Star” charger criteria. The device

uses

Pulse

Frequency

Modulation

(PFM)

method

to

build

discontinuous conduction mode (DCM) flyback power supplies.

The AP3776B provides accurate constant voltage (CV), constant

current (CC) and outstanding dynamic performance without requiring

an opto-coupler. It also eliminates the need of loop compensation

circuitry while maintaining stability.

The AP3776B achieves excellent regulation and high average

efficiency, less than 10mW no-load power consumption and less than

1s startup time. When AP3776B is used with AP4341, APR343 or

APR3415, good under-shoot performance and higher conversion

efficiency can be achieved.

The AP3776B is available in SO-8 package.

Features



Primary Side Control for Eliminating Opto-coupler



10mW No-load Input Power



Compensation for External Component Temperature Variations



Flyback Topology in DCM Operation



Random Frequency Adjustment to Reduce System EMI



Semi-valley Turn on for the Higher Efficiency



Built-in Soft Start



Over Voltage Protection



Over Temperature Protection



Short Circuit Protection



AP4341, APR343 or APR3415 Awaking Signal Detection



Audio Noise Reduction



Internal Cable Compensation



SO-8 Package



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

1

2

3

4

8

7

6

5

IS

EM

VCC

OUT

FB

CPC

VCS

GND

SO-8

Applications



Adapter/Chargers for Shaver, Cell/Cordless Phones, PDAs, MP3

and Other Portable Apparatus



Standby and Auxiliary Power Supplies

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html

for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.