Device simplifies design of industrial supplies for 440VAC line input
19-05-2015 |
Power Integrations
|
Power
Power Integrations has announced a new reference design (DER-479)
demonstrating an industrial power supply using the company's LinkSwitch-4TM
family of CV/CC primary-side regulated (PSR) switcher ICs with a 1200V
bipolar junction transistor (BJT). The design supports 440 VAC 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 (RBSOA) and system reliability. Additionally, the
LinkSwitch-4 controller's 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 50 mW
under no-load conditions while maintaining a fast transient response.
The 65kHz operating frequency minimizes transformer size, reducing system
cost and PCB footprint. LinkSwitch-4 devices also compensate for a number of
factors including: transformer inductance tolerances; input line voltage
variations; cable voltage drop; and external component temperature
variations.
Silvestro Fimiani, senior product marketing manager, Power Integrations,
said: "Power supplies for high-voltage systems such as three-phase meters
and motor drives can be challenging to develop - efficiency, reliability and
component count often suffer in such designs. By pairing the LinkSwitch-4
controller with a 1200V BJT, the designs become very straightforward and
extremely reliable."
The DER-479 is freely-downloadable from the Power Integrations web site,
says the company.
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