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UC3851
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UC3851

  • Category:ACDC- and -DCDC-power supply
  • Product Name:Programmable offline PWM controller
  • Manufacturers:TI
  • Production Batch Number:08+
  • Encapsulation:18PDIP, 18SOIC
  • Stock Status:There is stock
  • Stock Quantity:2470
  • Minimum order quantity: 1
  • Details:Click here to find PDF information for UC3851
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  • Product introduction

The family of PWM controllers UC1851 is best suited for offline primary side control. These devices include a high current totem pole output stage and a switching flip absolute 50% duty cycle limit failure. In all other respects, this pair of control lines is pin-compatible with the UC1841 series. These high-performance controllers share features for all major household chores, making them ideal for cost-sensitive applications.

Important features for these managers include low current start-up, linear feedback constant voltage second surgery, and compatibility with voltage or current mode control advances. In addition, these devices include a programmable start-up threshold, as well as programmable overvoltage, undervoltage, and overcurrent fault thresholds.

characteristic
 
  • All control, drive, monitoring and protection functions include:
  • The low-current start-up circuit is offline
  • Feed-forward voltage or current mode control
  • The totem pole outputs a large current
  • 50% absolute maximum duty cycle
  • PWM latches are single pulses per cycle
  • The pulse passes pulse current limit and turns off overcurrent faults
  • There are no start-up or shutdown transients
  • Slow start, shutting down after both initial and failure
  • Sensing too high or too low voltage after shutdown
  • Retry after successive latches or failures
  • 1% benchmark accuracy
  • 500kHz operation
  • 18-pin or 20-pin DIL PLCC package
parameter
    UC3851
topology   Boost, buck, reverse, forward
Control method   Current mode, voltage mode
Duty cycle (max.) (%)   50
Frequency (max) (khertz)   450
On/Off of Undervoltage Lockout Threshold (5)   8/7.8
Pins/Packets   18PDIP，18SOIC
(#) Regulated output   One
Operating temperature range(°C)   0 to 70

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