UC384XA

Features: TRIMMED OSCILLATOR DISCHARGE CURRENTCURRENT MODE OPERATION TO 500kHz AUTOMATIC FEED FORWARD COMPENSATIONLATCHING PWM FOR CYCLE-BY-CYCLE CURRENT LIMITINGINTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUTHIGH CURRENT TOTEM POLE OUTPUT UNDERVOLTAGE LOCKOUT WITH HYSTERESISLOW START-UP CU...

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SeekIC No. : 004535644 Detail

UC384XA: Features: TRIMMED OSCILLATOR DISCHARGE CURRENTCURRENT MODE OPERATION TO 500kHz AUTOMATIC FEED FORWARD COMPENSATIONLATCHING PWM FOR CYCLE-BY-CYCLE CURRENT LIMITINGINTERNALLY TRIMMED REFERENCE WITH UN...

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Part Number:
UC384XA
Supply Ability:
5000

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

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Upload time: 2024/3/28

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Product Details

Description



Features:

TRIMMED OSCILLATOR DISCHARGE CURRENT
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 CURRENT (< 0.5mA) DOUBLE PULSE SUPPRESSION




Pinout

Symbol Parameter Value Unit
Vi SupplyVoltage(lowimpedancesource) 30 V
Vi Supply Voltage (Ii < 30mA) SelfLimiting  
IO Output Current ±1 A
EO Output Energy (capacitive load) 5 J
  Analog Inputs (pins 2, 3) 0.3 to 5.5 V
  Error Amplifier Output Sink Current 10 mA
Ptot Power Dissipation at Tamb25(DIP8) 1.25 W
Ptot Power Dissipation at Tamb 25 (SO-8) 800 mW
Tstg Storage Temperature Range 65 to 150
TJ Junction Operating Temperature 40 to 150
TL Lead Temperature (soldering 10s) 300



Specifications

Symbol Parameter Value Unit
Vi SupplyVoltage(lowimpedancesource) 30 V
Vi Supply Voltage (Ii < 30mA) SelfLimiting A
IO Output Current ±1
EO Output Energy (capacitive load) 5 J
  Analog Inputs (pins 2, 3) 0.3 to 5.5 V
Error Amplifier Output Sink Current 10 mA
Ptot Power Dissipation at Tamb25DIP8) 1.25 W
Ptot Power Dissipation at Tamb 25(SO-8) 800 mW
Tstg Storage Temperature Range 65 to 150
TJ Junction Operating Temperature 40 to 150
TL Lead Temperature (soldering 10s) 300



Description

The UC384xA 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 a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable 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 UC3842A and UC3844A have UVLO thresholds of 16V (on) and
10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843A and UC3845A are 8.5 V and 7.9V. The UC3842A and UC3843A can operate to duty cycles approaching 100%. 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 output off every other clock cycle.




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