UNISONIC TECHNOLOGIES CO.
, LTD
UC3869
Preliminary
HIGH
VOLTAGE GREEN MODE PWM CONTROLLER
DESCRIPTION
The UTC UC3869 is a highly integrated current mode PWM control IC with high
voltage start up, optimized for high performance, low standby power consumption and cost effective offline flyback converter applications.
PWM switching frequency at normal operation is internally fixed and is trimmed to a tight range.
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 internal slope compensation improves system stability at high PWM duty cycle output.
Leading-edge blanking on curr...