LT1737 Datasheet | Linear Technology

LT1737 High Power Isolated Flyback Controller Features s s s DESCRIPTIO s s s s s s s s s Drives External Power MOSFET Supply Voltage Range: 4.5V to 20V Flyback Voltage Limited Only by External ponents Senses Output Voltage Directly from Primary Side Winding- No Optoisolator Required Switching Frequency from 50k Hz to 250k Hz with External Capacitor Moderate Accuracy Regulation Without User Trims Regulation Maintained Well into Discontinuous Mode External ISENSE Resistor Optional Load pensation Optional Undervoltage Lockout Shutdown Feature Reduces IQ to 50µA Typ Available in 16-Pin GN and SO Packages The LT®1737 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 DC supply voltage. Output voltage feedback information may be supplied by a variety of methods including a third transformer winding, the primary winding or even direct DC feedback (see Applications Information). Its gate drive capability, coupled with a suitable external MOSFET and other power path ponents, can deliver load power up to tens of Watts. The LT1737 has a number of Features not found on other isolated flyback controller 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. Optional load pensation circuitry allows for improved load regulation. An optional undervoltage lockout pin halts operation when the application input voltage is too low. An optional external capacitor implements a softstart function. , LTC and LT are registered trademarks of Linear Technology Corporation. U APPLICATIO S s s s Isolated Flyback Switching Regulators Medical Instruments Instrumentation Power Supplies TYPICAL APPLICATIO R2 35.7k 1% D2 BAS16 12V-18V to Isolated 15V Converter VIN C1 22µF + Q1 2N3906 T1 COILTRONICS...