Single-Ended, Current-Mode PWM Controller Is Pin Compatible with UCC28C43/UCC28C45 Series and Offers Better Performance
SUNNYVALE, CA-November 21, 2005-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX5094, a high-performance single-ended current-mode PWM controller for isolated telecom DC-DC or universal offline input AC-DC power supplies. This device is pin compatible with the industry standard and multisourced UCC28C43 and UCC28C45 family of products. Moreover, the MAX5094 provides lower startup current, tighter oscillator-frequency tolerance, and tighter current-sense accuracy than the UCC28C43 and UCC28C45, so designers can easily upgrade existing power-supply designs for higher performance with minimal component changes.
The MAX5094's switching frequency is externally programmable from 20kHz to 1MHz. In addition the switching frequency is trimmed for ±7% accuracy while current-limit threshold and start/stop voltages are trimmed for ±5% accuracy. The timing-capacitor discharge current is trimmed to ±5%. This allows accurate programming of the maximum duty cycle, which is 100% and 50% for the MAX5094A and MAX5094B respectively. The device's low 60ns cycle-by-cycle current-limit propagation delay provides a fast response to output short circuit. Startup current is typically 35 microamps which allows the use of a high-value startup resistor, thus reducing power dissipation and the size of the startup resistor. The MAX5094 gate-driver output is capable of sourcing 2A and sinking 1A.
Rated for operation over a wide -40°C to +125°C temperature range, the MAX5094 is available in 8-pin SO and 8-pin microMAX® packages. Pricing starts at $0.64 (1000-up FOB USA).
microMAX is a registered trademark of Maxim Integrated Products, Inc.
|
