Product category: Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: UCC38051
Edited by the Electronicstalk Editorial Team on 16 July 2003
Controller improves PFC performance
The UCC38051 is today a high-performance, transition-mode power factor correction (PFC) controller with zero power detect and improved slew rate response
The cost-effective controller provides increased functionality for offline and DC/DC switch mode power supplies such as desktops, computer monitors, television sets, set-top boxes and other distributed power systems such as electronic ballasts. TI's UCC38051 provides a low offset transconductance voltage amplifier for feedback error processing, a simple multiplier for generating a current command in sync with the input voltage, a current sense pulsewidth modulation (PWM) comparator with logic, and a totem-pole driver for driving an external FET.
This article was originally published on Electronicstalk on 16 July 2003 at 8.00am (UK)
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The lower undervoltage lockout turn-on threshold of the UCC38051 allows the operation of the PFC device to be easily controlled by the downstream PWM controller in two-stage power convertors.
The controller provides typical source current as low as 180mA for faster startup operation and improved transient response when output is low at startup or during transient conditions.
Pin-compatible with many industry standard PFC devices, the UCC38051 controller is available now from TI and its authorised distributors to support the industrial temperature range of -40 to +105C or commercial temperature range of 0 to 70C.
The device is offered in a space-saving, eight-pin small outline integrated circuit (SOIC) and plastic dual-inline (PDIP) package.
Suggested resale pricing starts at $0.65 each in quantities of 1000.
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