Two ultra-small PWM current-mode controllers

12 March 2003 Power Electronics / Power Management

ON Semiconductor has introduced the NCP1203 and NCP1200A - two space-saving Pulse Width Modulator (PWM) current-mode controllers that enable power supply designers to meet standby power regulations such as Energy Star and Blue Angel with a low-cost optimised solution.

The NCP1200 product family sets the standard for standby power consumption over the universal input voltage range whilst maintaining high power conversion efficiency during normal operating mode. The device family provides a flexible way to mix and match with external MOSFETs to serve product applications from 5 W to more than 100 W with the same basic power-supply design and footprint. The NCP1203 and the NCP1200A offer user-programmable peak current, output drive capability of 250 mA, as well as a 'skip-cycle' mode for excellent efficiency at light loads.

The NCP1200A is a second-generation version of the existing NCP1200 with improved FET drive capability, lower standby power consumption and ON Semiconductor's proprietary Dynamic Self-Supply circuitry. This circuitry allows power to be drawn directly from the high-voltage rail at start-up, eliminating the need for an auxiliary transformer winding.

The NCP1203 is ideally suited for providing the lowest possible standby power consumption in numerous end-product designs. In independent tests, a 70 W switched mode power supply (SMPS) built with the NCP1203 consumed only 86 mW of standby power at maximum line voltage (242 V) - the best performance in its class.

Both the NCP1203 and the NCP1200 are offered in surface mount SO-8 package as well as the traditional PDIP-8 package.

For more information contact Avnet Kopp, 011 809 6100, [email protected], www.avnet.co.za

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