AP3983R

Document number: DS38247 Rev. 3 - 2

1 of 15

www.diodes.com

June 2016

© Diodes Incorporated

AP3983R

PRIMARY SIDE REGULATED SWITCHING MODE POWER SUPPLY CONTROLLER

Description

The AP3983R is a power switcher for power supplies with better

conversion efficiency, better voltage & current accuracy, and improved

protection functions. Typical applications include chargers and

adapters. The AP3983R with built-in MOSFET, regulates the output

voltage and current in the primary side by piecewise Pulse Frequency

Modulation (p-PFM) in discontinuous conduction mode (DCM). The

system operating frequency reduces linearly from heavy load to light

load in each interval of the p-PFM, and enters constant current mode

when the load current equals to the maximum system output current.

The AP3983R provides accurate constant voltage (CV), constant

current (CC) and outstanding dynamic performance without requiring

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

circuitry while maintaining stability.

The AP3983R has a built-in fixed cable voltage drop compensation of

8% and adjustable line-voltage compensation.

The AP3983R achieves excellent regulation and high average

efficiency, less than 2s startup time for 75mW standby power solution.

When the AP3983R is adopted with APR3415, good undershoot

performances can be achieved.

The AP3983R is packaged in SO-7.

Applications



Adapters/Chargers



Standby and Auxiliary Power Supplies

Pin Assignments

(Top View)

CPC

FB

VCC

CS

D

D

GND

1

2

3

4

7

6

5

SO-7 (M Package) For AP3983R

Features





Less than 75mW Standby Power Consumption



Meet Efficiency Requirement of COC Trier 2



Valley Turn-on to Reduce Switching Loss and Improve EMI



Piecewise

Frequency

Reduction

to

Enhance

Conversion

Efficiency and Suppress Audio Noise



Overvoltage Protection (OVP)



Over-Temperature Protection (OTP)



Short Circuit Protection (SCP) with Hiccup

Operating

Frequency

Jitter

Function

for

Conductive

EMI

Suppression



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



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

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.