LT1725IS#PBF

LT1725 is a monolithic switching regulator controller specifically designed for the isolated flyback topology. It drives the gate of an external MOSFET and is generally powered from a third transformer winding. These features allow for an application input voltage limited only by external power path components. The third transformer winding also provides output voltage feedback information, such that an optoisolator is not required. Its gate drive capability coupled with a suitable external MOSFET can deliver load power upto tens of watts. It has a number of features not found on most other switching regulator ICs. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. Its unique control circuitry can maintain regulation well into discontinuous mode in most applications. It is used in application such as telecom isolated converters, offline isolated power supplies, instrumentation power supplies etc.

• Application input voltage limited only by external power components
• Senses output voltage directly from primary side winding—no optoisolator required
• Accurate regulation without user trims
• Regulation maintained well into discontinuous mode
• Optional load compensation, optional undervoltage lockout
• Switching frequency is 100KHz typical
• Gate output rise/fall time is 30ns typical
• Switch current limit is 250mV typical
• Operating junction temperature is -40°C TO 125°C
• Package style is 16-lead NSOIC

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