PWM controllers enable low standby consumption for SMPS

23 February 2005 Power Electronics / Power Management

ON Semiconductor's NCP1230 and NCP1231 families of PWM controllers are current mode controllers ideal for power supply applications in notebook adapters, off-line battery chargers and consumer electronics equipments. The devices allow the power supply designer to shut-down the power factor correction (PFC) stage in light or no-load conditions. PFC is needed in power supply designs from 50 W to 75 W, but it typically becomes a liability by continuing to consume power at light loading. The NCP1230 and NCP1231 families of PWM controllers are said to be the only devices on the market offering the PFC shut-down feature.

The NCP1230 and NCP1231 families are a series of current mode controllers offering cycle skipping at light loads, internal ramp compensation, and frequency dithering for improved EMI performance. Both families feature the power factor shutdown feature and are available in three frequency options - 65 kHz, 100 kHz, and 133 kHz. A short-circuit protection independent of the auxiliary winding ensures a safe and robust design. The NCP1230 integrates a 2,5 ms soft-start, an internal high-voltage start-up current source for lossless start-up, while in the NCP1231 the soft start is adjustable and a brown out function has been added. The NCP1230A device also includes a proprietary soft-skipping mode at light loading which prevents acoustic noise generation.

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