Linear Technology LT3511 high-voltage switching regulator

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Linear Technology has announced the LT3511, 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 is required for feedback since the output voltage is sensed from the primary-side flyback signal. The device operates over a 4.5 to 100 V input, has a 240 mA, 150 V power switch and delivers up to 2.5 W, making it suitable for a wide variety of telecom, datacom, motor vehicle, industrial and medical applications.

The regulator 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, permits the use of a smaller transformer compared with 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.

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