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UC2843

STMicroelectronics
Part Number UC2843
Manufacturer STMicroelectronics
Description CURRENTMODE PWM CONTROLLER
Published Mar 9, 2018
Detailed Description UC2842/3/4/5 ® UC3842/3/4/5 CURRENT MODE PWM CONTROLLER . OPTIMIZED FOR OFF-LINE AND DC TO DC CONVERTERS . LOW START-U...
Datasheet PDF File UC2843 PDF File

UC2843
UC2843

Overview
UC2842/3/4/5 ® UC3842/3/4/5 CURRENT MODE PWM CONTROLLER .
OPTIMIZED FOR OFF-LINE AND DC TO DC CONVERTERS .
LOW START-UP CURRENT (< 1 mA) .
AUTOMATIC FEED FORWARD COMPENSA- TION .
PULSE-BY-PULSE CURRENT LIMITING .
ENHANCED LOAD RESPONSE CHARAC- TERISTICS .
UNDER-VOLTAGE LOCKOUT WITH HYSTERESIS .
DOUBLE PULSE SUPPRESSION .
HIGH CURRENT TOTEM POLE OUTPUT .
INTERNALLY TRIMMED BANDGAP REFER- ENCE .
500 KHz OPERATION .
LOW RO ERROR AMP DESCRIPTION TheUC3842/3/4/5family of controlICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal externalparts count.
Internallyimplementedcircuits include undervoltagelockout featuring start-up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, Minidip SO14 logic to insure latched operation, a PWM comparatorwhich also providescurrentlimit control,and a totem pole output stage designed to source or sink high peak current.
The output stage, ...


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