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Regulator features wide input range

Posted: 06 Jul 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Allegro MicroSystems? step-down regulator? A8498?

Allegro MicroSystems Inc. expanded its current family of step-down regulators by adding a 3A fixed off-time, current-mode-controlled buck-switching regulator. According to the company, the A8498's 8V to 50V input range makes it ideal where a wide range of input voltages may occur.

Targeted at the consumer electronics and industrial markets, the general-purpose buck regulator is suitable for various end products, including uninterruptible power supplies, 12V lighter-powered applications, automotive 12V or 24V input applications with higher voltage protection, point of sale applications, and industrial applications with 24V or 36V bus.

The A8498 can handle a wide input of operating voltage ranges. The regulator requires an external clamping diode, inductor and filter capacitor, and the off time is determined by an external resistor. It will operate in both continuous and discontinuous modes. An internal blanking circuit will be used to filter out transients due to the reverse recovery of the external clamp diode. Typical blanking time is 200nS, and the output voltage is adjustable from 0.8V to 24V based on a resistor divider and the 0.8V 3 percent reference.

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