AP3983E Datasheet, PDF (1/10 Pages) Diodes Incorporated – HIGH FREQUENCY PRIMARY SIDE POWER SWITCHER FOR OFF-LINE SMPS

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.
Pin Assignments
(Top View)
CPC 1
FB 2
VCC 3
CS 4
7 GND
6D
5D
PDIP-7 For AP3983E
Applications
 Adapters
 Set Top Boxes
 Auxiliary Supplies
 Appliances
 LED Driver
Features
 Primary Side Control for Eliminating Opto-coupler
 Valley Switching Turn on for Higher Efficiency and Better EMI
Performance
 Better Transient Characteristics
 Built-in N Channel MOSFET with 700 BVDSS
 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)
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.
AP3983E
Document number: DS38875 Rev. 3 - 2
1 of 10
www.diodes.com
June 2016
© Diodes Incorporated