AP3783R

Document number: DS37448 Rev. 5 - 2

1 of 17

www.diodes.com

October 2015

© Diodes Incorporated

AP3783R

PRIMARY SIDE REGULATED SWITCHING MODE POWER SUPPLY CONTROLLER

Description

The AP3783R is a high frequency, high efficiency and high accuracy

switching mode power supply controller to drive power MOSFET for

5V/2A battery charger/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 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 AP3783R 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 AP3783R provides valley turn-on function and 3-Segment drive

current to improve the power supply EMI performance. The AP3783R

also has built-in fixed cable voltage drop compensation (8%, 4% and

2% of nominal system output voltage to meet various cables with

different length and gauge) and adjustable line voltage compensation.

The AP3783R achieves excellent regulation and high average

efficiency, less than 2s startup time for 30mW standby power solution.

When AP3783R is used with APR3415, good undershoot and

efficiency performances can be achieved.

The AP3783R is packaged in SOT26.

Applications



Adapters/Chargers



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 30mW 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

20W

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.