LM1575HV Datasheet | National Semiconductor

Description The LM2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator capable of driving a 1A load with excellent line and load regulation These devices are available in fixed output voltages of 3 3V 5V 12V 15V and an adjustable output version Requiring a minimum number of external ponents these regulators are simple to use and include internal frequency pensation and a fixed-frequency oscillator The LM2575 series offers a high-efficiency replacement for popular three-terminal linear regulators It substantially reduces the size of the heat sink and in many cases no heat sink is required A standard series of inductors optimized for use with the LM2575 are available from several different manufacturers This feature greatly simplifies the design of switch-mode power supplies Other features include a guaranteed g4% tolerance on output voltage within specified input voltages and output load conditions and g10% on the oscillator frequency External shutdown is included featuring 50 m A (typical) standby current The output switch includes cycle-by-cycle current limiting as well as thermal shutdown for full protection under fault conditions Features Y 3 3V 5V 12V 15V and adjustable output versions Y Adjustable version output voltage range 1 23V to 37V (57V for HV version) g4% max over line and load conditions Y Guaranteed 1A output current Y Wide input voltage range 40V up to 60V for HV version Y Requires only 4 external ponents Y 52 k Hz fixed frequency internal oscillator Y TTL shutdown capability low power standby mode Y High efficiency Y Uses readily available standard inductors Y Thermal shutdown and current limit protection Y Pa Product Enhancement tested Applications Y Simple high-efficiency step-down (buck) regulator Y Efficient pre-regualtor for linear regulators Y On-card switching regulators Y Positive to negative converter (Buck-Boost) Typical Application (Fixed Output...