UC2845BN - ST Microelectronics

UC2845BN HIGH-PERFORMANCE PWM CONTROLLER

Differences between members of this family are the under-voltagelockout thresholds and maximum duty TheUC384xB family ofcontrolICs providesthe nec- cycle ranges. The UC3842B and UC3844B have essary features to implement off-line or DC to DC UVLO thresholds of 16V (on) and 10V (off), ideally fixed frequency current mode control schemes wwwwit.DhataSheet4U.

Features

to implement off-line or DC to DC UVLO thresholds of 16V (on) and 10V (off), ideally fixed frequency current mode control schemes wwwwit.DhataSheet4Us.cuomitedoff-lineapplicationsThecorrespondingthresh- a minimal external parts count. Internally imple- oldsforthe UC3843BandUC3845Bare8.5 V and7.9 mented circuits include a trimmed oscillator for pre- V. The UC3842B and UC3843B can operate to duty cise DUTY CYCLE CONTROL under voltage lock- cycles approaching 100%. A range of the zero to < outfeaturingstart-up current less than0.5mA,a pre- 50 % is obtained by the UC3844B and UC3845B by cisi.