Step-down converter

14 October 2015 Power Electronics / Power Management

Torex Semiconductor has developed the XC9252 series of 105°C step-down DC-DC controllers with 30 V operation and a low supply current. This is a high breakdown voltage product with an input voltage of 30 V, input rating of 36 V, and a peak voltage of 46 V for 400 ms.

The input voltage range is wide – from 3,0 V to 30 V – and the P-channel MOS driver transistor is controlled to provide a stable output voltage even when the dropout voltage is low. The output voltage can be set to any value from 1,5 V upwards using external resistors.

PWM/PFM auto switching control realises high efficiency over the entire load range, and a low supply current is achieved to increase efficiency at light loads, making this controller ideal for a variety of applications. The switching frequency can be set to any value from 280 kHz to 550 kHz by connecting an external resistor, while unnecessary noise can be suppressed by synchronising to an external clock within a range of ±25% of the internal clock.

Any value can be set for the soft-start time by adding an external capacitor, and an under-voltage lockout function that forcibly turns off the driver transistor when the input voltage is 2,5 V or less is incorporated. As protective circuits, over-current protection, short-circuit protection and thermal shutdown are implemented to enable safe use.

For more information contact Arnold Perumal, Avnet South Africa, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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