Flyback regulator suited for variety of automotive, industrial, medical and defence applications

08-03-2017 | Linear | Power

Linear Technology’s H-grade versions of the LT8304/-1, monolithic flyback regulators has guaranteed operation for junction temperatures as high as 150C. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no opto-coupler or third winding for regulation. The device operates over a 3V to 100V input voltage range, has a 2A/150V integrated DMOS power switch and delivers up to 24W of output power, making it well suited for a wide variety of automotive, industrial, medical and defence applications. The new LT8304-1 version is tailored for high output voltages up to 1kV.

The devices operate in boundary mode, which is a variable frequency current mode control switching scheme, typically resulting in better than ±5% output voltage regulation over the full line, load and temperature range. Boundary mode enables the use of a smaller transformer compared to equivalent continuous conduction mode designs. Several off-the-shelf transformers, identified in the data sheet, can be used for numerous applications. The high level of integration and the use of low ripple Burst Mode® operation result in a simple to use, low component count and high efficiency solution for isolated power delivery.

Additional features include output short-circuit protection, 116µA no load operating quiescent current, accurate enable and undervoltage lockout with hysteresis, internal soft-start and loop compensation, along with output diode temperature compensation.

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