The UC3845N is a Current Mode PWM Controller optimized for off-line and DC to DC converters. This device 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 include under-voltage lockout featuring start up current less than 1mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-channel MOSFETs, is low in the off state.
● Optimized for off-line and DC to DC converters
● Low start up current (<1mA)
● Automatic feed forward compensation
● Pulse-by-pulse current limiting
● Enhanced load response characteristics
● Under-voltage lockout with hysteresis
● Double pulse suppression
● High current totem pole output
● Internally trimmed bandgap reference
● Green product and no Sb/Br
