AIC3843

Features:

Low Start-Up Current (300mA Typical)
Internal Precision Reference.
500KHz Current-Mode Operation.
Pulse-by-Pulse Current Limiting.
Automatic Feed-Forward Compensation.
Optimized for Off-line and DC/DC Converters.
Under-voltage Lockout with Hysteresis.
Double Pulse Suppression.
High Current Totem Pole Output.




Application

AC/DC Off-line Converter.
DC/DC Off-line Converter.




Pinout






Specifications

Description

The AIC3843 control IC provides the features that are necessary to implement off-line or DC/DC Converter fixed-frequency current-mode schemes with a minimum number of external components. This integrated circuits features an under-voltage lockout (UVLO) with approxi-mately 300uA start-up current, a precision reference trimmed for accuracy at the error amplifier input, high gain error amplifier, current sensing comparator, logic to insure latched operation, and a totem-pole output stage designed to source or sink high peak current. The output stage, suitable for driving the N- channel MOSFETs, is low in the off state.


The AIC3843 control IC provides the features that are necessary to implement off-line or DC/DC Converter fixed-frequency current-mode schemes with a minimum number of external components. This AIC3843 integrated circuits featuresan under-voltage lockout (UVLO) with approximately 300mA start-up current, a precision reference trimmed for accuracy at the error amplifier input, high gain error amplifier, current sensing comparator, logic to insure latched
operation, and a totem-pole output stage designed to source or sink high peak current. The output stage, suitable for driving the Nchannel MOSFETs, is low in the off state.