AP3902

Data Sheet LOW POWER PWM SWITCH FOR OFF-LINE SMPS General Description The AP3902 PWM power switch consists of a fixedfrequency current-mode PWM controller and a high voltage transistor. It is specifically designed for high performance off-line switching power supplies or nonisolated 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. AP3902 Features · · · · · · · · · Built-in NPN Transistor with 700VCBO 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 OptoCoupler 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 Auxilia...