LT1737IGN#PBF

LT1737 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. Its gate drive capability, coupled with a suitable external MOSFET and other power path components, can deliver load power up to tens of Watts. It 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 compensation circuitry allows for improved load regulation. It is used in application like isolated flyback switching regulators, medical instruments, instrumentation power supplies etc.

• Supply voltage range is 4.5V to 20V
• Senses output voltage directly from primary side winding—no opt isolator required
• Switching frequency is 100KHz typical at (COSCAP = 100pF)
• Moderate accuracy regulation without user trims
• Regulation maintained well into discontinuous mode
• External ISENSE resistor, optional load compensation
• Optional undervoltage lockout
• Supply current is 10mA typical, shutdown current is 50µA typical
• Operating temperature is -40°C to 125°C
• Package style is 16-lead plastic SSOP

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