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UC1572 Status: OBSOLETE

Negative Output Flyback Pulse Width Modulator


      
         
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 UC2572 
TopologyFlyback  
Vin(Min)(V)4.2  
Vin(Max)(V)35  
Vout(Min)(V)-70  
Vout(Max)(V)-1  
Regulated Outputs(#)1  
Iout(Max)(A)0.5  
Switching Frequency(Max)(kHz)300  
Iq(Typ)(mA)9  
Pin/Package8PDIP, 8SOIC  
Thermal ShutdownNo  
RatingCatalog  
Duty Cycle(Max)(%)100  
 Samples
 Inventory

Other qualified versions of UC1572

Version Part Number Definition
Catalog UC3572 TI's standard catalog product

Product Information

Features

  • Simple Single Inductor Flyback PWM for Negative Voltage Generation
  • Drives External PMOS Switch
  • Contains UVLO Circuit
  • Includes Pulse-by-Pulse Current Limit
  • Low 50uA Sleep Mode Current

Description

The UC3572 is a negative output flyback pulse width modulator which converts a positive input voltage to a regulated negative output voltage. The chip is optimized for use in a single inductor negative flyback switching converter employing an external PMOS switch. The block diagram consists of a precision reference, an error amplifier configured for voltage mode operation, an oscillator, a PWM comparator with latching logic, and a 0.5A peak gate driver. The UC3572 includes an undervoltage lockout circuit to insure sufficient input supply voltage is present before any switching activity can occur, and a pulse-by-pulse current limit. Output current can be sensed and limited to a user determined maximum value.

View All Description in Datasheet

    

Pricing / Packaging / CAD Design Tools / Samples

PackagingSamples
DeviceStatusTemp (oC)Package | PinsSamples
UC1572JOBSOLETE-55 to 125(J) | 8 Not Available

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