LT1737

VCC Supply Voltage ................................................. 22V
UVLO Pin Voltage .................................................... VCC
ISENSE Pin Voltage .................................................... 2V
FB Pin Current ..................................................... ±2mA
Operating Junction
Temperature Range
LT1737C ............................................... 0°C to 100°C
LT1737I ............................................ 40°C to 125°C
Storage Temperature Range ........... 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C


Description

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 components, 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 compensation 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.