UTC3843E Datasheet Text
UTC3843D/E
LINEAR INTEGRATED CIRCUIT
CURRENT MODE PWM CONTROL CIRCUITS
DESCRIPTION
The UTC3843D/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 parator 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.
DIP-8
Features
- Optimized for off-line and DC to DC converts
- Low start up current(<1mA)
- Automatic feed forward pensation
- 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
SOP-8
ORDERING INFORMATION
Device
Package
UTC3248D
DIP-8-300-2.54
UTC3248E
SOP-8-225-1.27
BLOCK DIAGRAM
Vref
8
Internal Bias...
