UCC1581 - Unitrode

UCC1581 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 MOSFE.

Features

• Low 85µA Startup Current BLOCK DIAGRAM
• Low 300µA Operating Current
• Automatically Disabled Startup Preregulator
• Programmable Minimum Duty Cycle with Cycle Skipping
• Programmable Maximum Duty Cycle
• Output Current 1A Peak Source and Sink
• Programmable Soft Start
• Programmable Oscillator Frequency
• External Oscillator Synchronization Capability application INFO available UCC1581 UCC2581 UCC3581 Note: Pin Connection shown for 14-pin Package UDG-95011-1 DESCRIPTION The UCC3581 voltage mode pulse width modulator is designed to control low power isolated DC - DC converters .