AP4341S

Document number: DS38219 Rev. 2 - 2

1 of 8

www.diodes.com

December 2015

© Diodes Incorporated

AP4341S

DYNAMIC PSR ACCELERATOR

Description

The AP4341S is an output voltage detector for Primary Side Control

System. It is a low power loss solution. It detects the output voltage

and provides a periodical signal when the output voltage is lower than

a certain threshold. The periodical signal can be coupled by the

transformer to the primary side and provided as an awakening signal

for the main primary side controller. By fast response to secondary

side voltage, the AP4341S can effectively improve the transient

performance of Primary Side Control System.

The AP4341S will enable a discharge circuit when it detects the

output voltage is higher than a certain threshold.

The AP4341S can cooperate with some PSR ICs, such as AP3775,

GP350H and GP350BX.

The AP4341S is available in SOT23 package.

Features



Fast Detector of Supply Voltages



33kHz Output Pulse



No External Components



Low Power Loss for Green Mode Applications



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



Halogen and Antimony

Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

GND

VCC

OUT

3

2

1

SOT23

Applications



Adapters/Chargers for Cell/Cordless Phones, ADSL Modems,

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.

Typical Applications Circuit

+

C1

FR1

+

C2

L 1

TR1

D1

+

FB

R16

OUT

VCC

R2

R17

CS

IC1

CPC

GND

C6

R3

R4

R10

Q1

C3

D4 to D7

L2

R12

C8

D2

R5

+

C4

D3

C5

R11

OUT

GND

VCC

IC2

AP4341S

EM

R6

R7

IS