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UCC2961 Datasheet Advanced Primary-side Startup Controller

Manufacturer: Unitrode

Overview: ą UCC2961, UCC3961 ADVANCED PRIMARYĆSIDE STARTUP CONTROLLER D Operates with Secondary–Side PWM Control D Isolated PWM Command through a Pulse Transformer D Initial Free-Running Soft-Startup with Duty-Cycle Clamping D Up to 400-kHz Synchronizable Switching Frequency D High-Current FET Drive (1.5-A Sink, 0.75-A Source) SLUS431A – MAY 2000 – REVISED DECEMBER 2000 D Multi-Mode Overcurrent Protection with Restart, Latching, or Cycle-by-Cycle Current Limiting D Programmable Volt-Second Clamp for Transformer Reset D Undervoltage Lockout with 2-V Hysteresis D Low-Current Startup with Optional Disconnect D Programmable Overvoltage and Undervoltage Protection D 8–pin Version Also Available (UCC3960) typical application diagram VIN VOLT SEC CLAMP UCC3961 14 UV/OV STOP 1 UVS START OVS VDD 13 12 8 VS REF 6 OPTIONAL DEPLETION MODE SWITCH + – OUT 11 FEED BACK SOFT START FREQ SET 4 3 5 7 CS 9 FB SS RT SD 2 AGND PGND 10 FAULT LATCH DELAY CSD UDG–99039 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Datasheet Details

Part number UCC2961
Manufacturer Unitrode
File Size 281.28 KB
Description Advanced Primary-Side Startup Controller
Datasheet UCC2961-Unitrode.pdf

General Description

The UCC3961 advanced primary-side startup controller is a unique solution that provides all the primary-side functions required for a single-ended, isolated, switch-mode power converter incorporating secondary-side PWM control.

It is usable with a wide range of secondary control circuits and is especially well suited for systems where sophisticated handling

Key Features

  • such as output current sharing and synchronous rectification are implemented more easily. The UCC3961 provides all the circuitry required on the primary side of a secondary-side controlled power supply. It features a free running 60-kHz to 360-kHz oscillator which is synchronizable to the secondary-side PWM signal and also has the ability to accept start/stop PWM commands from the isolating pulse-edge transformer (PET). The use of an extremely small and low-cost pulse transformer allows for high.

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UCC2961 Distributor