UC3843

Features: *Optimized For Off-line And DC To DC Converters*Low Start Up Current (<1mA)*Automatic Feed Forward Compensation*Pulse-by-pulse Current Limiting*Enhanced Load Response Characteristics*Under-voltage Lockout With Hysteresis*Double Pulse Suppression*High Current Totem Pole Output*Internal...

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SeekIC No. : 004535629 Detail

UC3843: Features: *Optimized For Off-line And DC To DC Converters*Low Start Up Current (<1mA)*Automatic Feed Forward Compensation*Pulse-by-pulse Current Limiting*Enhanced Load Response Characteristics*Un...

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Part Number:
UC3843
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: 2024/11/22

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Product Details

Description



Features:

*Optimized For Off-line And DC To DC Converters
*Low Start Up Current (<1mA)
*Automatic Feed Forward Compensation
*Pulse-by-pulse Current Limiting
*Enhanced Load Response Characteristics
*Under-voltage Lockout With Hysteresis
*Double Pulse Suppression
*High Current Totem Pole Output
*Internally Trimmed Bandgap Reference
*500khz Operation
*Low RO Error Amp





Application

Audio
Automotive
Broadband
Digital Control
Military
Optical Networking
Security
Telephony
Video & Imaging
Wireless





Pinout

  Connection Diagram




Specifications

Supply Voltage(LowImpedanceSource)..................30V
Supply Voltage(ICC <30mA)...................... SelfLimiting
Output Current.................................................... ±1A
Output Energy(CapacitiveLoad) ............................5J
Analog Inputs(Pins2,3).......................... -0.3Vto+6.3V
Error Amp Output Sink Current ..........................10mA
Power Dissipation at TA25(DIL-8)................... 1W
Power Dissipation at TA25(SOIC-14).........725mW
StorageTemperatureRange.................-65 to+150
JunctionTemperatureRange ................-55 to+150
LeadTemperature(soldering,10seconds)........... 300





Description

The UC1842/3/4/5 family of control ICs provides the necessary 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 under-voltage lockout featuring start up current less than1mA,aprecision reference trimmed for ac curacyat the error ampinput,logic to insure latched operation,a PWM comparator which also provide scurrentl imit control,and a totem poleout put stage designed to source or sink high peak current.The out put stage,suit able for driving N Channel MOSFETs,is low in the off state.

Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges.The UC1842 and UC1844 have UVLO thresholds of 16V (on) and 10V (off),ideally suited to off-line applications.The corresponding thresholds for the UC1843 and UC1845 are 8.4V and 7.6V.The UC1842 and UC1843 can operate to duty cycles approaching 100%.A range of zero to 50% is obtained by the UC1844 and UC 1845 by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.






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