TI Unveils Its New UCC38C42 PWM Controllers
Texas Instruments Inc. (TI, Dallas, TX) unveiled its latest family of industry-standard, current-mode pulse-width modulation controllers. Built using a BiCMOS process, the UCC38C42 family features a 10-fold reduction in start-up current, while operating supply current is lowered from 11mA to only 2.3mA. A three-fold reduction in the current-sense delay offers overload protection at the power switch, making these devices ideal for a variety of telecommunications, data-communications, merchant power and industrial power supply
applications.
This new family of controllers not only provide 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.
"The popular architecture of this eight-pin-based power management control
technology was pioneered and first introduced by TI's Power Supply Control
Products group (formerly Unitrode)," said Bill Andreycak, product marketing
engineer, TI. "With the UCC38C42 family, TI continues to enable designers of advanced power supply applications to maximize their systems' performance."
The parts also house several protection
functions, including under-voltage lockout, pulse-by-pulse over-current limiting and double-pulse suppression. For applications requiring a 50-percent maximum duty cycle, the UCC38C44 contains UVLO thresholds of
14.5V/9.0V while the UCC38C45 uses 8.4V/7.6V thresholds. The UCC38C4x controllers are rated from 0 to +70 degrees C and, the UCC28C4x controllers are rated from -40 to +85 degrees C.
The UCC38C42 family is available now from TI. Packaging options include eight-pin thru-hole PDIP along with the surface-mount SOIC. For more space-constrained applications, the eight-pin MSOP package is available, minimizing height and board area. Suggested resale pricing is $0.99 each in quantities of 1,000.
