UC2842B/3B/4B/5B
®
UC3842B/3B/4B/5B
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
.
TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL
.
OSCILLATOR FREQUENCY GUARANTEED AT 250kHz
.
CURRENT MODE OPERATION TO 500kHz .
AUTOMATIC FEED FORWARD COMPENSA-
TION
.
LATCHING PWM FOR CYCLE-BY-CYCLE CURRENT LIMITING
.
INTERNALLY TRIMMED REFERENCE WITH UNDER
VOLTAGE LOCKOUT
.
HIGH CURRENT TOTEM POLE OUTPUT .
UNDER
VOLTAGE LOCKOUT WITH HYSTER-
ESIS
.
LOW START-UP AND OPERATING CURRENT
DESCRIPTION
The UC384xB family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count.
Internally implemented circuits ...