AP3983E

Document number: DS38875 Rev. 3 - 2

1 of 10

www.diodes.com

June 2016

© Diodes Incorporated

AP3983E

HIGH FREQUENCY PRIMARY SIDE POWER SWITCHER FOR OFF-LINE SMPS

Description

The AP3983E is high frequency power switcher for power supplies

with better conversion efficiency, better voltage & current accuracy,

and improved protection functions. Typical applications include

adapter for ADSL, home appliance power supply, LED lighting power

supply and PC auxiliary power supplies. The AP3983E 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 AP3983E provides operating frequency dithering function to

improve EMC performance of power supply. The AP3983E also has

built-in fixed cable voltage drop compensation and adjustable line

voltage compensation.

The AP3983E solution has fewer component number, smaller size,

and lower total cost.

The AP3983E is packaged in PDIP-7.

Features



Primary Side Control for Eliminating Opto-coupler



Valley Switching Turn on for Higher Efficiency and Better EMI

Performance



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)



AP3983E for 20W Adapter and 25W in Open Frame Design



Totally Lead-free & Fully RoHS Compliant (Note 2 & 3)



Halogen and Antimony Free.

“Green” Device (Note 4)

Pin Assignments

(Top View)

1

2

3

4

7

6

5

CPC

FB

VCC

CS

D

D

GND

PDIP-7 For AP3983E

Applications



Adapters



Set Top Boxes



Auxiliary Supplies



Appliances



LED Driver

Note:

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.