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Aerospace

100 V Flyback Regulator Operates at 150°C

17 February 2017

LT8303H flyback regulator. Source: Linear Technology. LT8303H flyback regulator. Source: Linear Technology. Linear Technology Corporation announced the H-grade version of the LT8303, a monolithic flyback regulator with guaranteed operation for junction temperatures as high as 150°C. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no opto-isolator or third winding for regulation. The LT8303 operates over a 5.5 V to 100 V input voltage range, has a 0.45 A/150 V integrated DMOS power switch and delivers up to 5 W of output power, suiting it for a wide range of telecom, datacom, automotive, industrial, medical and military applications.

The output voltage is set with only one external resistor and the transformer turns ratio. Several off-the-shelf transformers, identified in the data sheet, can be used for numerous applications. The LT8303 operates in boundary mode, which is a variable frequency current mode control switching scheme, typically resulting in ±1% output voltage load and line regulation. Boundary mode enables the use of a smaller transformer compared to equivalent continuous conduction mode designs. 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 overload and short-circuit protection, 70 µA no load operating quiescent current, internal loop compensation along with an accurate enable and undervoltage lockout with hysteresis.

The LT8303H operates over a –40°C to 150°C junction temperature range and is available in a small SOT-23 package. Pricing starts at $3.65 each in 1000-piece quantities.



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