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UC3867
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UC3867

  • Category:ACDC- and -DCDC-power supply
  • Product Name:Resonant mode power controller
  • Manufacturers:TI
  • Production Batch Number:10+
  • Encapsulation:16PDIP, 16SOIC
  • Stock Status:There is stock
  • Stock Quantity:5000
  • Minimum order quantity: 1
  • Details:Click here to find PDF information on UC3867
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  • Product introduction

The IC-1868 series of UC1861 is best suited for the control of zero-current switching and zero-voltage switching quasi-resonant converters. This differs from UVLO's threshold and output selection to the members of the various combinations of device family results. In addition, a single-pulse steering logic configuration scheme is configured for either zero-current systems at the time (UC1865-1868) or zero-voltage switching applications at off-time (UC1861-1864).

The main control module implementation consists of an error amplifier to compensate for the entire system cycle, driving a voltage-controlled oscillator (VCO) with programmable minimum and maximum frequencies. Triggered by the VCO, the maximum width of one program is generated at a time, and zero-modulated pulses can be compared by detection.

characteristic
 
  • Control a zero-current switch (zero-current) or zero-voltage switch (zero-voltage switch) quasi-resonant converter
  • Zero crossing terminates a single-shot trigger timer
  • 1% accuracy, soft-start 5V reference
  • Programmable delay after reboot failure
  • Voltage controlled oscillator (VCO) and programmable minimum and maximum frequencies from 10kHz to 1MHz
  • Low Start-up Current (150μA Typical)
  • Dual 1 amp peak FET drivers
  • UVLO options are available for offline or DC/DC applications
parameter
  UC3867
topology Full bridge, half bridge, push and pull
Control method Voltage mode
Duty cycle (max.) (%) 50
Frequency (max) (khertz) 450
On/Off of Undervoltage Lockout Threshold (5) 8 / 7
Pins/Packets 16PDIP，16SOIC
(#) Regulated output 2
Operating temperature range(°C) 0 to 70

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