AC-DC Digital PWM IC Integrates 800-V Bipolar Power Transistor
Wed, 09/29/2010 - 8:47am
iWatt’s iW1810 AC/DC digital PWM IC, which is designed for the industrial market, integrates an 800-V bipolar power transistor to protect rugged offline power supplies for household appliances, motor control, and smart meters from high-line surge voltage while maintaining better than 5 percent output voltage regulation and consuming less than 100 mW in standby mode. With an integrated high-voltage power transistor and the high 64 kHz switching frequency to reduce the size of the transformer and capacitors, designers can fit up to 3-W power supplies into compact 25 mm x 25 mm x 15 mm form factors using only 21 components. Digital feedback and control allows better than +2 percent output voltage regulation in typical isolated power supply designs with primary-side regulation.