UC2844/UC2845中文资料HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS数据手册UTC规格书

描述 Description

The UTC UC2844/2845 are high performance fixed frequency current mode controllers that specifically designed for Off-Line and DC to DC converter applications with minimal external parts count. The differences between UC2844 and UC2845 are the maximum duty cycle ranges and under-voltage lockout thresholds. The UC2844 ideally suited to off-line applications with UVLO thresholds of 16V(ON) and 10V(OFF), and UC2845 has UVLO thresholds of 8.5V(ON) and 7.6V(OFF) for lower voltage applications.

特性 Features

· Operation output switching frequency up to 500 kHz  
· Output deadtime adjustable from 50% to 70%
· Automatic feed forward compensation
· Latching PWM for cycle-by-cycle current limiting
· High current totem pole output
· Internally trimmed reference with under voltage lockout
· UVLO with hysteresis
· Low startup and operating current