AP3983B/C/D

Document number: DS36784 Rev. 4 - 2

1 of 13

www.diodes.com

July 2016

© Diodes Incorporated

AP3983B/C/D

HIGH FREQUENCY PRIMARY SIDE POWER SWITCHER FOR OFF-LINE SMPS

Description

The AP3983B/C/D are series of high frequency power switcher for

power supplies with better conversion efficiency, better voltage &

current

accuracy,

and

improved

protection

functions.

Typical

applications include charger, adapter for ADSL, home appliance

power supply, LED lighting power supply and PC auxiliary power

supplies. The AP3983B/C/D with built in MOSFET, 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 AP3983B/C/D has good transient characteristics. Typically,

minimal voltage of 4.3V at PCB side can be achieved for dynamic test

of 5V application system.

The AP3983B/C/D provides operating frequency dithering function to

improve EMC performance of power supply. The AP3983B/C/D also

has built-in fixed cable voltage drop compensation and adjustable line

voltage compensation.

The AP3983B/C/D solution has fewer component number, smaller

size, and lower total cost.

The AP3983B/C is packaged in SO-7. The AP3983C/D is packaged in

PDIP-7.

Features



Primary Side Control for Eliminating Opto-coupler



Better Transient Characteristics





Low Start-up Current: 0.2

A (Typ.)



Internal Output Cable Voltage Drop Compensation



Hiccup Function to Improve Short Circuit Protection



Better Over Voltage Protection



Better Over Temperature Protection



Low Total Cost Solution



Output Power Range (Note 1)

:

AP3983B for 6W Adapter

AP3983C (SO-7) for 7.5W

AP3983C (PDIP-7) for 10W Adapter

AP3983D for 18W Adapter



Totally Lead-Free & Fully RoHS Compliant (Notes 2 & 3)



Halogen and Antimony Free.

“Green” Device (Note 4)

Pin Assignments

(Top View)

CPC

FB

VCC

CS

D

D

GND

1

2

3

4

7

6

5

SO-7 For AP3983B/C

(Top View)

1

2

3

4

7

6

5

CPC

FB

VCC

CS

D

D

GND

PDIP-7 For AP3983C/D

Applications



Adapters



Set Top Boxes



Auxiliary Supplies



Appliances



LED Driver

Notes:

1. Typical continuous power in a non-ventilated enclosed adapter measured at +50°C ambient.

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

3. 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.

4. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.