UCC25701/2

      The UCC25701/2 is a Advanced Voltage Mode Pulse Width Modulator.The UCC25701/2 has features including 700kHz Operation;Integrated Oscillator/ Voltage Feed Forward Compensation;Accurate Duty Cycle Limit;Accurate Volt-second Clamp;Optocoupler Interface Fault Counting Shutdown;Fault Latch off or Automatic Shutdown;Soft Stop Optimized for Synchronous Rectification;1A Peak Gate Drive Output;130A Start-up Current;750A Operating Current.
      The UCC25701/2 are offered in the 14 pin SOIC (D),14 pin PDIP (N) or in 14 pin TSSOP (PW) packages.The voltage slope on CT is proportional to line voltage over a 4:1 range and equals 2•VFF (RT•CT). The devices feature low startup current, allowing for efficient off-line starting, yet have sufficient output drive to switch power MOSFETs in excess of 500kHz. Voltage feed forward compensation is operational over a 5:1 input range  and provides fast and accurate response to input voltage changes over a 4:1 range. An accurate volt-second clamp and maximum duty cycle limit are also featured. This soft stop feature allows the synchronous rectifiers to gradually discharge the output LC filter. An abrupt shut off can cause the LC filter to oscillate, producing unpredictable output voltage levels.ng excellent dynamic line regulation.The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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