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100-V isolated monolithic flyback regulator requires no optocoupler

December 06, 2010 | Paul Buckley | 222901258
100-V isolated monolithic flyback regulator requires no optocoupler Linear Technology Corporation has introduced a high voltage isolated monolithic flyback switching regulator that simplifies the design of an isolated DC/DC converter. No optocoupler, third winding or signal transformer are required for feedback since the output voltage is sensed from the primary-side flyback signal.

The LT3511 operates over a 4.5 V to 100 V input voltage range, has a 240 mA, 150 V power switch and delivers up to 2.5 W of output power, making it well suited for a wide variety of telecom, datacom, automotive, industrial and medical applications.

The LT3511 operates in a boundary mode, a current-mode control switching scheme, resulting in ±5% typical regulation over the full line, load and temperature range. Boundary mode, also known as critical conduction mode or CCM, permits 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 transformers identified in the data sheet can be used for numerous applications. The high level of integration results in a simple, clean, tightly regulated application solution to the traditional challenge of isolated power delivery.

Additional features include an onboard low dropout regulator for IC power, undervoltage lockout and output voltage temperature compensation.

Availability and Pricing

The LT3511 is available in a small MSOP-16 package with 4 pins removed for additional high voltage pin spacing. In addition to the extended and industrial versions that operate over a junction temperature range from -40 to 125 degrees C, a high temperature automotive grade is available that operates from -40 to 150 degrees C. Pricing starts at $2.95 each in 1000-piece quantities.

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