AP3902 Datasheet, PDF (1/9 Pages) BCD Semiconductor Manufacturing Limited – LOW POWER PWM SWITCH FOR OFF-LINE SMPS

Data Sheet
LOW POWER PWM SWITCH FOR OFF-LINE SMPS
General Description
Features
AP3902
The AP3902 PWM power switch consists of a fixed-
frequency current-mode PWM controller and a high
voltage transistor. It is specifically designed for high
performance off-line switching power supplies or non-
isolated small household applications. Compared to
discrete MOSFET and PWM controller power supply
solutions, AP3902 solution offers advantages such as
fewer component numbers, smaller size, and lower
total cost.
In normal operation, the AP3902 features with a fixed
switching frequency. When the output power falls
below a given level, the circuits automatically switches
to a burst mode by skipping some switching cycles. In
case of failure modes like open loop, over voltage or
overload due to short circuit, the device switches into
auto restart mode which is controlled by the internal
protection unit.
This IC adopts frequency dithering technique to reduce
EMI.
The AP3902 is available in DIP-8 package.
· Built-in NPN Transistor with 700V_CBO
· Current Mode Control with Skip Cycle Capability
· Low Operating Current: 0.45mA
· Fixed Switching Frequency: 60kHz
· Frequency Dithering for Low EMI
· Short Circuit Protection
· Open and Short Circuit Protection for Opto-
Coupler
· Maximal Input Power less than 0.2W under no
Load
· Output Power Range:
5W to 10W for Adapter with Outer Enclosure
5W to 13W for Open Frame Application
Applications
· Induction Cooker
· Set-Top Boxes/DVB
· Adapters
· Auxiliary Power Supplies
· DVD
Sep. 2008 Rev. 1.0
DIP-8
Figure 1. Package Type of AP3902
BCD Semiconductor Manufacturing Limited
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