Micropower Voltage Mode PWM

The UCC3581 voltage mode pulse width Modulator is designed to control low power isolated DC - DC converters in applications such as Subscriber Line Power (ISDN I.430). Primarily used for single Switch forward and flyback converters, the UCC3581 features BiCMOS circuitry for low startup and operating current, while maintaining the ability to drive Power MOSFETs at frequencies up to 100kHz. The UCC3581 Oscillator allows 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 control 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 external 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 minimum duty cycle clamp. When a duty cycle below the minimum is called for, the Modulator skips cycles to provide the correct average duty cycle required for output regulation. This effectively reduces the switching frequency, 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 specified for operation from ?40C to +85C, and the UCC3581 is specified for operation from 0C to +70C.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
UCC2581DTR Texas Instruments Micropower Voltage Mode PWM 14-SOIC -40 to 85
UCC2581Q Texas Instruments 1A SWITCHING CONTROLLER, 21kHz SWITCHING FREQ-MAX, PQCC20, LCC-20
UCC2581D Texas Instruments Micropower Voltage Mode PWM 14-SOIC -40 to 85
UCC2581DG4 Texas Instruments Micropower Voltage Mode PWM 14-SOIC -40 to 85
UCC2581J Texas Instruments 1A SWITCHING CONTROLLER, 21kHz SWITCHING FREQ-MAX, CDIP14, CERAMIC, DIP-14
UCC2581DTRG4 Texas Instruments Micropower Voltage Mode PWM 14-SOIC -40 to 85
UCC2581L Texas Instruments 1A SWITCHING CONTROLLER, 100kHz SWITCHING FREQ-MAX, CQCC20
UCC2581 's PackagesUCC2581 's pdf datasheet
UCC2581D SOIC
UCC2581DG4 SOIC
UCC2581DTR SOIC
UCC2581DTRG4 SOIC
UCC2581J
UCC2581Q




UCC2581 Pinout, Pinouts
UCC2581 pinout,Pin out
This is one package pinout of UCC2581,If you need more pinouts please download UCC2581's pdf datasheet.

UCC2581 Application circuits
UCC2581 circuits
This is one application circuit of UCC2581,If you need more circuits,please download UCC2581's pdf datasheet.


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