Reference design simplifies industrial PSUs
Power Integrations has announced the DER-479 reference design, which demonstrates an industrial power supply using the company’s LinkSwitch-4 family of CV/CC primary-side regulated switcher ICs with a 1200V Bipolar Junction Transistor (BJT). The design supports 440VAC line inputs and features three outputs, which combine to provide up to 11W of highly accurate constant-voltage DC power.
LinkSwitch-4 controllers feature an adaptive base and emitter switched drive scheme to boost switching performance and increase efficiency. The advanced switching technique is especially beneficial in high-voltage applications as it reduces slow turn-off switching losses and eliminates BJT failures due to secondary breakdown, improving the reverse-bias safe operating area and system reliability.
The LinkSwitch-4 controllers' primary-side regulated sensing methodology eliminates expensive and unreliable optocouplers, replacing them in the feedback loop with a simple transformer winding. The design uses just 50mW under no-load conditions while maintaining a fast transient response.
The 65kHz operating frequency minimises transformer size, reducing system cost and PCB footprint. The controller devices also compensate for a number of factors including: transformer inductance tolerances, input line voltage variations, cable voltage drop, and external component temperature variations.
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