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UC3844
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UC3844

  • Category:ACDC- and -DCDC-power supply
  • Product Name:Current mode PWM controller
  • Manufacturers:TI
  • Production Batch Number:10+
  • Encapsulation:14SOIC, 8PDIP, 8SOIC
  • Stock Status:There is stock
  • Stock Quantity:40000
  • Minimum order quantity: 1
  • Details:Click here to find a PDF of UC3844
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  • Product introduction

The UC1842/3/4/5 family provides the necessary functions to implement a fixed frequency current mode control scheme with minimal external component count off-wire or DC-to-DC fixed frequency current mode. Internal implementation circuitry includes undervoltage lockout with a start-up current of less than 1 mA, an accurate reference accuracy trim at the input of the error amplifier, logic registration to ensure lockout operation, PWM comparators that provide current limit control while providing current limit, and a totem pole output to stage the design of high peak currents for sources or sinks. Output stage, driving N-channel MOSFETs suitable for low off.

The difference between this family member is the undervoltage lockout threshold and the maximum duty cycle range.

characteristic
 
  • Optimize offline and DC-DC converters
  • Low start-up current" (
  • Automatic Forward Compensation
  • The pulse is limited by the pulse current
  • Enhanced load response characteristics
  • Undervoltage lockout
  • Double pulse suppression
  • The totem pole outputs a large current
  • Internal fine-tuning bandgap reference
  • 500 - kHz operation
parameter
      UC3844
topology     Boost, buck, reverse, forward
Control method     Current mode
Duty cycle (max.) (%)     50
Frequency (max) (khertz)     450
On/Off of Undervoltage Lockout Threshold (5)     16/10
Pins/Packets     14SOIC,8PDIP,8SOIC
(#) Regulated output     One
Operating temperature range(°C)     0 to 70

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