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MFG:LINFINIT  Package Cooled:SOP8  

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Part Number: UC3843A

 

MFG: LINFINIT

Package Cooled: SOP8

 

Description: The UC384xA family of controlICs provides the nec- essary features to implement off-line or DC to DC fixed frequency cu...


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UC3843A General Description


The UC384xA family of controlICs provides the nec- essary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally imple-mented circuits include a trimmed oscillator for pre-cise DUTY CYCLE CONTROL under voltage lock- out featuring start-up currentl ess than0.5mA,a pre-cision reference trimmed for accuracyat the error am pinput,logicto insure latched operation,a PWM comparatorwhich also providescurrent limit control, and a totem pole output stage designed to source or sink high peak current.The outputstage,suitable for driving N-Channel MOSFETs, is low in the off-state.

Differences between member softh is family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC3842A and UC3844A have UVLO thresholds of 16V (on) and 10V (off), ideally suitedoff lineapplications The corresponding thresh- olds for the UC3843A and UC3845A are 8.5V and 7.9V.The UC3842A and UC3843A can operate to dutycycles approa ching100%.A range of the zero to <50 is obtained by the UC3844A and UC3845A by the addition of an internal toggle flip flop which blanks the out put off every otherclock cycle.

UC3843A Maximum Ratings

Symbol
Parameter
Value
Unit
Vi
 SupplyVoltage(lowimpedance source)
30
V
Vi
 SupplyVoltage(Ii < 30mA)
SelfLimiting
IO
 OutputCurrent
±1
A
EO
 OutputEnergy (capacitive load)
5
J
 AnalogInputs (pins2, 3)
0.3to 5.5
V
 ErrorAmplifierOutput SinkCurrent
10
mA
Ptot
 PowerDissipation at Tamb 25°C (Minidip)
1.25
W
Ptot
 PowerDissipation at Tamb 25°C (SO8)
800
mW
Tstg
 Storage Temperature Range
65to 150
°C
TJ
 Junction OperatingTemperature
40to 150
°C
TL
 LeadTemperature (soldering 10s)
300
°C

UC3843A Connection Diagram

UC3843A Connection Diagram

UC3843A datasheet

UC3843A
PDF/DataSheet Download

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