Diodes AP3988/89/90 - Manual

AP3988/89/90
Document number: DS36722 Rev. 3 - 2
1 of 13
www.diodes.com
March 2014
© Diodes Incorporated
AP3988/89/90
A Product Line of
Diodes Incorporated
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PRIMARY SIDE POWER SWITCHER FOR OFF-LINE SMPS
Description
The AP3988/89/90 is a performance enhanced 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 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 AP3988/89/90 provides operating frequency dithering function
to improve EMC performance of power supply. The AP3988/89/90
also has built-in fixed cable voltage drop compensation (5% of
nominal system output voltage) and adjustable line voltage
compensation.
The AP3988/89/90 solution has fewer component number, smaller
size, and lower total cost.
The AP3988 is packaged in SO-7. The AP3989/90 is packaged in
PDIP-7.
Features

Primary Side Control for Eliminating Opto-coupler and
Secondary CV/CC Control Circuitry
 Built-in NPN Transistor with 700V
CBO

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) :
AP3988 for 5.5W Adapter
AP3989 for 8W Adapter
AP3990 for 12W Adapter
 Totally Lead-free & Fully RoHS Compliant (Note 2 & 3)
 Halogen and Antimony Free. “Green” Device (Note 4)
Pin Assignments
(Top View)
SO-7 (M Package) For AP3988
(Top View)
PDIP-7 (P7 Package) For AP3989/90
Applications
 Adapters

Set Top Boxes

Auxiliary Supplies
 Appliances
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
2
3
4
7
6
5
CPC
FB
VCC
CS C
C
GND