APR348

Document number: DS42016 Rev. 5 - 2

1 of 9

www.diodes.com

March 2021

© Diodes Incorporated

APR348

SECONDARY SIDE SYNCHRONOUS RECTIFICATION CONTROLLER

Description

The APR348 is a secondary-side MOSFET driver for synchronous

rectification, which can effectively reduce the secondary-side rectifier

power dissipation and provide a high-performance solution.

The APR348 can support continuous or discontinuous conduction

mode (CCM and DCM) and quasi-resonant flyback operation based on

a MOSFET operating on-time control technology. This technology

provides minimized turn-on and turn-off delay to reduce power loss and

keep safe operation without adding any external components or

circuitry.

The APR348 can configure into high-side or low-side application to fit

various design requirement. It also has specialized light load mode and

determines safe driver pulse generation through load detection. The

VDD power supply can be charged by VDET or VCC, which means it

can be charged by internal PLR (Pulse linear regulator) at low output

voltage and charged by internal LDO at high output voltage. Therefore,

it can provide a wide output operation voltage from 3.3V to 20V.

The APR348 is available in SOT26 (Type CJ) package.

Features



Synchronous Rectification Controller



Suited for High-Side and Low-Side Flyback Converters in

CCM/DCM/QR Operation



Minimized Turn-On and Turn-Off Delay



Internal UVLO Protection



Light Load Mode Control



Eliminate False Turn-On with Resonant Ring



Fewest External Components



Moisture Sensitivity: MSL Level 1 per J-STD-020



Terminals: Finish

– Matte Tin Plated Leads, Solderable per

M2003 JESD22-B102, Method 208



Weight: 0.016/0.017 grams (Approximate)



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



Halogen and Antimony Free.

“Green” Device (Note 3)



For automotive applications requiring specific change

control (i.e. parts qualified to AEC-Q100/101/200, PPAP

capable, and manufactured in IATF 16949 certified facilities),

please contact us or your local Diodes representative.

https://www.diodes.com/quality/product-definitions/

Pin Assignments

(Top View)

SOT26 (Type CJ)

Applications



Adapters/Chargers for Cell/Cordless Phones, ADSL Modems, MP3

and Other Portable Apparatus

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.

2. See https://www.diodes.com/quality/lead-

free/ 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.

DRISR

1

2

3

4

5

6

VCC

GND

Rx

VDET

VDD