Product Summary

TheUC384xBfamily ofcontrolICs providesthenecessary 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 a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockoutfeaturingstart-up currentless than0.5mA,a precision reference trimmed for accuracy at the error
amp input,logicto insurelatched operation,a PWM
comparatorwhich alsoprovidescurrentlimit control,
and a totem pole output stage designed to source
or sink high peakcurrent.The outputstage,suitable
for driving N-Channel MOSFETs, is low in the offstate

Features

.TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL
.OSCILLATOR FREQUENCY GUARANTEED
AT 250kHz
.CURRENT MODE OPERATION TO 500kHz
.AUTOMATIC FEED FORWARD COMPENSATION
.LATCHING PWM FOR CYCLE-BY-CYCLE
CURRENT LIMITING
.INTERNALLY TRIMMED REFERENCE WITH
UNDERVOLTAGE LOCKOUT
.HIGH CURRENT TOTEM POLE OUTPUT
.UNDERVOLTAGE LOCKOUT WITH HYSTERESIS
.LOW START-UP AND OPERATING CURRENT

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
UC3843BD
UC3843BD

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM

Data Sheet

Negotiable 
UC3843BD1R2
UC3843BD1R2

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM

Data Sheet

Negotiable 
UC3843BD1R2G
UC3843BD1R2G

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max

Data Sheet

0-1: $0.37
1-25: $0.32
25-100: $0.23
100-500: $0.20
UC3843BDR2G
UC3843BDR2G

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM w/96% Duty Cycle Max

Data Sheet

0-1: $0.37
1-25: $0.32
25-100: $0.23
100-500: $0.20
UC3843BVD
UC3843BVD

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM

Data Sheet

Negotiable 
UC3843BVD1
UC3843BVD1

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM

Data Sheet

Negotiable 
UC3843BVD1R2
UC3843BVD1R2

ON Semiconductor

Current Mode PWM Controllers 52kHz 1A Current PWM

Data Sheet

Negotiable 
UC3843BVDG
UC3843BVDG

ON Semiconductor

Current Mode PWM Controllers ANA SMPS PWM CNTRLLR

Data Sheet

0-1: $0.93
1-25: $0.74
25-100: $0.65
100-500: $0.51