AP3983B/C/D
HIGH FREQUENCY PRIMARY SIDE POWER SWITCHER FOR OFF-LINE SMPS
Description
Pin Assignments
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.
(Top View)
GND
CPC
FB
1
2
3
4
7
6
D
D
VCC
CS
5
SO-7 For AP3983B/C
(Top View)
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.
1
2
7
CPC
FB
GND
The AP3983B/C/D solution has fewer component number, smaller
size, and lower total cost.
6
5
D
D
3
4
VCC
CS
The AP3983B/C is packaged in SO-7. The AP3983C/D is packaged in
PDIP-7.
PDIP-7 For AP3983C/D
Features
Primary Side Control for Eliminating Opto-coupler
Better Transient Characteristics
Applications
Built-in N Channel MOSFET with 650 BVDSS
Low Start-up Current: 0.2A (Typ.)
Adapters
Set Top Boxes
Auxiliary Supplies
Appliances
Internal Output Cable Voltage Drop Compensation
Hiccup Function to Improve Short Circuit Protection
Better Over Voltage Protection
LED Driver
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)
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.
1 of 13
www.diodes.com
July 2016
© Diodes Incorporated
AP3983B/C/D
Document number: DS36784 Rev. 4 - 2
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