UC3843A

PinoutSpecifications 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) 0.3...

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SeekIC No. : 004535630 Detail

UC3843A: PinoutSpecifications Symbol Parameter Value Unit Vi SupplyVoltage(lowimpedance source) 30 V Vi SupplyVoltage(Ii < 30mA) SelfLimiting IO OutputCurren...

floor Price/Ceiling Price

Part Number:
UC3843A
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/7

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Product Details

Description



Pinout

  Connection Diagram


Specifications

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



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.


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