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Simple and Robust Bias Power Supply with Low Standby for Home Appliances (TIDA-00434)
This reference design is a multiple output (12V, 3.3V/5V), 2.4W bias power supply for home appliances using a low cost Quasi-resonant PWM controller. The design supports conversion of wide range DC input ranging from 90V DC to 425V DC or AC input ranging from 85V AC to 300V AC to standard power rails of 12V and 3.3V/5V. TIDA-00434 is able to achieve reduced switching losses, using a buck power stage operating in discontinuous mode with valley switching. The design offers high efficiency (>70%) and low stand-by power of <100mW when system is in idle mode. The design uses low cost external 800V BJT as a switch providing higher operating voltage margin. The PWM controller has integrated safety feature that turns off the external switch in case of loss of feedback which helps in preventing high output voltages. Reconfiguring the designfor different output voltage and standby power consumption levels is easier with simple resistor value changes. Overall the design offers a simple and rugged bias power supply with low standby power.
Designed for wide operating input range 90VDC to 425VDC or 85 VAC to 300 VAC Very low standby power of < 100mW for no load conditions. Ultra-Simple circuit with low cost Off-the-shelf components Tight output regulation of < ±1% on all output rails. Robust Supply protected for Output Over-Current, Short-Circuit and Output Over-voltage conditions. Inherent open loop /loss of feedback detection in the controller shuts the converter and safe-guards the system from High voltage intrusion. Configurable for most of the output voltage needs from 1.5V to 15V with simple resistor change. Efficiency of 75% at 125VDC input, and 74% at 325VDC input and full load Small PCB form factor of 52 x 25 mm offers simplicity in usage. Meets the requirements of Conducted Emissions standard – EN55011 class A
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