Micropower Voltage Mode PWM

The UCC3581 voltage mode pulse width Modulator is designed to control low power isolated DC - DC convert- ers in applications such as Subscriber Line Power (ISDN I.430). Primarily used for single Switch forward and flyback converters, the UCC3581 features BiCMOS cir- cuitry for low startup and operating current, while main- taining the ability to drive Power MOSFETs at frequencies up to 100kHz. The UCC3581 Oscillator al- lows the flexibility to program both the frequency and the maximum duty cycle with two resistors and a capacitor. A TTL level input is also provided to allow synchronization to an external frequency source. The UCC3581 includes programmable soft start circuitry, overcurrent detection, a 7.5V linear preregulator to con- trol chip VDD during startup, and an on-board 4.0V Logic supply. The UCC3581 provides functions to maximize light load efficiency that are not normally found in PWM Controllers A linear preregulator driver in conjunction with an exter- nal depletion mode N-MOSFET provides initial controller power. Once the bootstrap supply is functional, the preregulator is shut down to conserve power. During light load, power is saved by providing a programmable mini- mum duty cycle clamp. When a duty cycle below the minimum is called for, the Modulator skips cycles to pro- vide the correct average duty cycle required for output regulation. This effectively reduces the switching fre- quency, saving significant Gate drive and power stage losses. The UCC3581 is available in 14-pin plastic and ceramic dual-in-line packages and in a 14-pin narrow body small outline IC package (SOIC). The UCC1581 is specified for operation from 55C to +125C, the UCC2581 is speci- fied for operation from 40Cto+85C, and the UCC3581 is specified for operation from 0C to +70C. By Texas Instruments
UCC1581 's PackagesUCC1581 's pdf datasheet

UCC1581 Pinout, Pinouts
UCC1581 pinout,Pin out
This is one package pinout of UCC1581,If you need more pinouts please download UCC1581's pdf datasheet.

UCC1581 Application circuits
UCC1581 circuits
This is one application circuit of UCC1581,If you need more circuits,please download UCC1581's pdf datasheet.

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