UTC3845E-电流型PWM控制电路
DESCRIPTION
The UTC3845D/E 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.
FEATURES
Optimized for off-line and DC to DC converts
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
500kHz operation
Low Ro error amp
