AP3988 データシートの表示（PDF） - Diodes Incorporated.
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AP3988 Datasheet PDF : 13 Pages
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A Product Line of
Diodes Incorporated
AP3988/89/90
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.
Pin Assignments
(Top View)
CPC 1
FB 2
VCC 3
CS 4
7 GND
6C
5C
SO-7 (M Package) For AP3988
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.
(Top View)
CPC 1
FB 2
7 GND
VCC 3
CS 4
6C
5C
PDIP-7 (P7 Package) For AP3989/90
Features
Primary Side Control for Eliminating Opto-coupler and
Secondary CV/CC Control Circuitry
Built-in NPN Transistor with 700VCBO
Low Start-up Current: 0.2A (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)
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.
AP3988/89/90
Document number: DS36722 Rev. 3 - 2
1 of 13
www.diodes.com
March 2014
© Diodes Incorporated
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