AP3783

Document number: DS37429 Rev. 6 - 2

1 of 17

www.diodes.com

December 2015

© Diodes Incorporated

AP3783

PRIMARY SIDE REGULATED SWITCHING MODE POWER SUPPLY CONTROLLER

Description

The AP3783 is a high performance AC/DC power supply controller for

battery charger and adapter applications. The controller regulates the

output voltage and current in the primary side by piece-wise Pulse

Frequency Modulation (p-PFM) in discontinuous conduction mode

(DCM).

The AP3783 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 AP3783 provides valley turn-on function, operating frequency

Jitter function (about 5.5% frequency change every

256μs) from light

to full load range and 3-segment drive current to improve the power

supply EMI performance. The AP3783 also has built-in fixed cable

voltage drop compensation (10%, 7% and 4% of nominal system

output voltage to meet various cables with different length and gauge)

and adjustable line voltage compensation.

The AP3783 is packaged in SOT26.

Applications



Adapters/Chargers



LED Lighting



Standby and Auxiliary Power Supplies

Pin Assignments

(Top View)

CS

GND

VCC

CPC

FB

DRI

1

2

3

4

5

Pin 1 Mark

6

SOT26

Features



Less than 75mW Standby Power Consumption



Meet Efficiency Requirement of COC Trier2



Valley Turn-on to Reduce Switching Loss and Improve EMI



Piece-wise

Frequency

Reduction

to

Enhance

Conversion

Efficiency and Suppress Audio Noise



Over Voltage Protection (OVP)



Over Temperature Protection (OTP)



Short Circuit Protection (SCP) with Hiccup



3-Segment Drive Current for Radiative EMI Suppression



Operating

Frequency

Jitter

Function

for

Conductive

EMI

Suppression



Drive

MOSFET

for

5W

to

30W

Battery

Charger/Adapter

Applications



SOT26 SMD Package Comply with Level 3 of IPC/JEDEC J-STD-

033A



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.