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Maxim PWM controllers compatible with UCC28C43, UCC28C45

Posted: 23 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Maxim Integrated Products? MAX5094? PWM controller?

Maxim Integrated Products announced a high-performance single-ended current-mode PWM controller for isolated telecom DC/DC or universal offline input AC-DC power supplies. The new MAX5094 PWM controller is pin compatible with the industry standard UCC28C43 and UCC28C45 family of products. Moreover, said Maxim, 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 programmable from 20kHz to 1MHz, and is trimmed for 17 percent accuracy. Meanwhile, current-limit threshold and start/stop voltages are trimmed for 15 percent accuracy. The timing-capacitor discharge current is trimmed to 15 percent. This allows accurate programming of the maximum duty cycle, which is 100 percent and 50 percent 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 355A 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 the -400C to 1250C temperature range, the MAX5094 is available in 8-pin SO and 8-pin microMAX packages. Pricing starts at 64 cents (1,000-up FOB USA).

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