UC3863L中文资料LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS数据手册UTC规格书

描述 Description

The UTC  UC3863L is a high performance current mode PWM controller ideally suited for low standby power. The PWM switching frequency is programmable externally at normal operation. Low VDDstartup current make the power reliable on startup design and a large value resistor could be used in the startup circuit to minimize the standby power. At no load condition, the IC operates in power-saving mode for lower standby power, decreasing frequency for Higher conversion efficiency at light load condition.   The UTC  UC3863L contains protection with automatic recovery including OLP (over load protection), OCP (cycle-by-cycle current limiting), and UVLO (VDD over voltage clamp and under voltage lockout). It also provides the protections including OTP (over temperature protection), OVP (over voltage protection) with latched shut down. To protect the power MOSFET, Gate-drive output is fixed up to 16V max. The internal slope compensation improves system stability at high PWM duty cycle output. Leading-edge blanking on current sense input removes the signal glitch, which offering minimal external component count in the design. Excellent EMI performance is achieved with UTC proprietary frequency hopping technique (ZL201020615247.1) together with soft driver control. Audio noise is eliminated due to switch frequency more than 20kHz during operation. The UTC UC3863L has such applications as: battery charger, power adaptor, set-top box power supplies, ink jet printers, open-frame SMPS.

特性 Features

UTC proprietary frequency hopping technology for Improved EMI performance.   Power-saving mode for high light-load and standby efficiency Dynamic peak current limiting for constant output power Built-in synchronized slope compensation OLP with automatic recovery OTP and OVP with latch shut down VDD clamp for higher security Programmable PWM Frequency Gate output voltage clamped at 16V Low start-up current Cycle-by-cycle Current Limiting Under voltage lockout (UVLO) Few external components required