Synchronous PWM controllers

26 May 2010 Analogue, Mixed Signal, LSI

ON Semiconductor recently introduced three new flexible synchronous pulse width modulation (PWM) controller devices – the NCP3020A, NCP3020B and NCP3011. Offering a wide input voltage range from 4,7 V to 28 V, these devices enable the flexibility to be used with a variety of input sources in consumer electronic equipment such as set-top-boxes and LCD televisions, as well as industrial and computing applications including printers, scanners and telecom systems.

The devices provide a 1 A integrated gate drive and are capable of producing output voltages as low as 0,6 V (NCP3020A and NCP3020B) and 0,8 V (NCP3011).

The NCP3011 also provides a buffered +1,25 V reference voltage which can be used as a low dropout (LDO) controller for one or two additional outputs. An internal oscillator sets the operating frequencies of 300 kHz (NCP3020A), 600 kHz (NCP3020B) and 400 kHz (NCP3011). A regulated digital soft-start limits in-rush current.

All three of the new PWM controllers feature an externally compensated transconductance error amplifier capable of being used with all ceramic output capacitors or electrolytic capacitors. Also included are an integrated boost diode that helps to reduce overall system size and cost, and an integrated boost drive clamp to regulate the driver supply voltage to 7,6 V to allow the use of lower voltage/higher efficiency MOSFETs. An enhanced suite of protection features includes lossless current limit, short circuit protection, output over-voltage protection, output under-voltage protection and input under-voltage lockout.

The NCP3011 includes a number of additional features such as dual level power-good, an enable/disable pin and external synchronisation. The external synchronisation allows two controllers to operate 180° out of phase for reduced input capacitance and system cost savings, as well as offering the ability to synchronise to a higher switching frequency.

For more information contact Robin Scholes, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za

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