Isolated monolithic flyback regulator delivers 15 W

14th November 2013

Nat Bowers

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Datasheet

Linear Technology has introduced a new monolithic flyback regulator which greatly simplifies the design of isolated DC-DC converters. Operating over a 2.8V to 42V input voltage range, the LT8302 features a 3.6A/65V power switch and delivers up to 15 Watts of output power. It is therefore ideal for a wide variety of industrial, medical, datacom, military and automotive applications.

Requiring no opto-isolator or third winding for regulation, the LT8302 samples the isolated output voltage directly from the primary-side flyback waveform. The LT8302 operates in boundary mode, a variable frequency current-mode control switching scheme. Enabling the use of a smaller transformer compared to equivalent continuous conduction-mode designs, boundary mode typically results in +/-5% regulation over the full line, load and temperature range.

The output voltage is easily set by two external resistors and the transformer turns ratio. Numerous applications can utilise off-the-shelf transformers (these are identified in the data sheet) to reduce BOM costs. Combined with the use of low ripple Burst Mode operation, this high integration level results in a simple to use, low component count and high efficiency application solution for isolated power delivery.

The LT8302 also features output short circuit protection, a 380µA no load quiescent current with the output voltage in regulation, internal soft start and compensation, and output diode temperature compensation.

Extended and industrial versions operate over a junction temperature range of -40°C to 125°C; a high temperature automotive grade operates from -40°C to 150°C; and a military grade operates from -55°C to 150°C.

Available now in a small thermally enhanced SO-8 package, pricing for the LT8302 starts at $3.47 (USD) each in 1000-piece quantities.