Product category: Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: UCC38C42 PWM controllers
Edited by the Electronicstalk Editorial Team on 10 September 2001
Tenfold power consumption
cut for PWM control
Claiming significantly reduced power consumption and shorter propagation delay times, Texas Instruments has a new family of industry-standard current-mode pulsewidth-modulation controllers
Claiming significantly reduced power consumption and shorter propagation delay times, Texas Instruments has a new family of industry-standard current-mode pulsewidth-modulation (PWM) controllers. Built using a BiCMOS process, the new devices feature a ten-fold reduction in start-up current (down from 500 to 50uA), while operating supply current is lowered from 11 to only 2.3mA.
This article was originally published on Electronicstalk on 10 September 2001 at 8.00am (UK)
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A three-fold reduction in the current sense delay (from 150 to 50ns) offers superior overload protection at the power switch, making these devices ideal for a variety of telecommunications, datacommunications, merchant power and industrial power supply applications.
This new family of UCC38C42 PWM controllers not only provides significant performance advantages for higher-speed and lower-power applications, but also offers drop-in replacements for TI's existing and new UC3842- and UC3842A-based designs with no external part changes required.
For accurate programming of the operating frequency, the UCC38C42 family's oscillator incorporates a trimmed discharge current.
Additionally, output dead-time control, hence maximum duty cycle, are both accurate and programmable.
The oscillator is useable with switching frequencies to 1MHz.
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Rated at +/-1A peak, the high-current totempole gate drive output boasts transitions with 25ns rise and 20ns fall times.
A 2.5V bandgap reference voltage for the error amplifier features a 1% initial accuracy for precise programming of the power supply output voltage.
The error amplifier has a 1.5MHz gain-bandwidth product and incorporates 90dB of gain.
The parts also house several protection functions, including undervoltage lockout, pulse-by-pulse overcurrent limiting and double-pulse suppression.
Family members include the 100% maximum duty cycle versions with undervoltage lockout turn-on/turn-off thresholds of 14.5/9.0V (UCC38C42) for offline applications and 8.4/7.6V (UCC38C43) for DC/DC convertors.
For applications requiring a 50% maximum duty cycle, the UCC38C44 contains UVLO thresholds of 14.5/9.0V while the UCC38C45 uses 8.4/7.6V thresholds.
The UCC38C4x controllers are rated from 0 to +70C and the UCC28C4x controllers are rated from -40 to +85C.
The UCC38C42 family is available now from TI and its authorised distributors.
Packaging options include 8-pin through-hole PDIP along with the surface-mount SOIC.
For more space-constrained applications, the 8-pin MSOP is available, minimising height and board area.
Suggested resale pricing is $0.99 each in quantities of 1000.
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