Many appliances and equipment require the availability of an auxiliary power source (SMPS) that works separately from the main power supply to support, for instance, stand-by operation. Power ratings can vary from a few to a few tens of watts for these auxiliary supplies, which can be either isolated or non-isolated. To ensure good performance, engineers must choose a power topology – including fly-back or quasi-resonant – that best meets the efficiency, size, safety and cost requirements.
Isolated auxiliary power supply 20-75W
In the 20 to 75W power range, the need to meet increasingly tight efficiency and stand-by requirements for auxiliary power supplies has pushed the use of quasi-resonant topologies replacing more mainstream fly-back based designs.
View application Isolated auxiliary power supply up to 20W
In the power range up to 20W, high-power-density and cost-effective isolated auxiliary power supplies can be designed using single-transistor fly-back, forward or quasi-resonant topologies working at relatively high switching frequencies to minimize
View application Non-isolated auxiliary power supply up to 20W
In a number of applications the reference of the secondary circuit is connected to the same reference as the primary – the AC mains. In such cases, an off-line non-isolated auxiliary power supply can be used to provide a regulated DC voltage using an
View application Our products and solutions
ST offers a wide portfolio of highly-integrated offline converters for applications up to 20 W with an extremely low total stand-by consumption – down to less than 4 mW – and breakdown voltages as high as 900 V. In addition to PWM switching controllers, power MOSFETs and diodes, we offer an extensive set of evaluation and development tools as well as reference designs to help engineers develop high-efficiency and compact auxiliary power supply solutions.
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