Product category: Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: UCC27223
Edited by the Electronicstalk Editorial Team on 22 January 2004
Enable pin adds
flexibility to low-voltage designs
Texas Instruments has added an enable pin to its widely adopted line of high-efficiency synchronous buck drivers for nonisolated low-output-voltage DC/DC convertors
Texas Instruments has added an enable pin to its widely adopted line of high efficiency synchronous buck drivers for nonisolated low-output-voltage DC/DC convertors. Providing a new driver with enable gives system power designers improved flexibility and control when managing low output voltages in central processing units, computing, telecomms, datacomms and general merchant power supply systems.
This article was originally published on Electronicstalk on 22 January 2004 at 8.00am (UK)
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The new UCC27223 driver with enable, and the previously announced UCC27221 and UCC27222 devices produce +/-3A of output drive current for efficient power mosfet switching at critical Miller plateau thresholds.
The UCC2722x family yields 2-4% better efficiency and up to 40% improved heat dissipation compared with competing ICs that support low output voltages.
The UCC27223 device's enable pin and proprietary predictive gate drive digital control technology reduce diode conduction and reverse recovery losses in synchronous rectifier mosfets.
Employing a closed loop feedback system that detects body-diode conduction, predictive gate drive adjusts dead time delays in the next switching cycle to minimize the conduction time interval in synchronous rectifiers.
In addition, the overall convertor efficiency improves up to 2-4%.
The new driver incorporates TI's hybrid TrueDrive output stage with paralleled bipolar and CMOS transistors to allow efficient current delivery at low supply voltages.
The UCC2722x drivers are available in volume from TI and its authorised distributors in thermally enhanced low-profile HTSSOP-14 PowerPAD (PWP) packages.
Suggested resale pricing of the UCC27223 device with enable in quantities of 1000 units is $1.25.
TI's new VIP online selection tool, evaluation modules, user guides and application notes on predictive gate drive and predictive, synchronous buck drivers are available from the TI power website.
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