Isolated monolithic flyback regulator simplifies designs and delivers up to 15-W
By sampling the isolated output voltage directly from the primary-side flyback waveform, the LT8302 requires no opto-isolator or third winding for regulation. The LT8302 operates over a 2.8 V to 42 V input voltage range, has a 3.6 A/65 V power switch and delivers up to 15 Watts of output power, making it well suited for a wide variety of industrial, medical, datacom, military and automotive applications.
The LT8302 operates in boundary mode, which is a variable frequency current-mode control switching scheme, typically resulting in +/-5% 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. The output voltage is easily set by two external resistors and the transformer turns ratio. 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 application solution for isolated power delivery.
Additional features include output short circuit protection, a 380 µA no load quiescent current with the output voltage in regulation, internal soft start and compensation, along with output diode temperature compensation.
Availability
The LT8302 is available in a small thermally enhanced SO-8 package. 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. Pricing starts at $3.47 each in 1000-piece quantities.
More information about the LT8302 monolithic flyback regulator at
www.linear.com/product/LT8302
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