SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator

The LM2596 series of Regulators are monolithic integrated circuits that provide all the active functions for a Step-down (buck) Switching Regulator capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version.
Requiring a minimum number of external components, these Regulators are simple to use and include internal frequency compensation?, and a fixed-frequency Oscillator
The LM2596 series operates at a switching frequency of 150 kHz thus allowing smaller sized Filter components than what would be needed with lower frequency Switching Regulators Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package.
A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed 4% tolerance on output voltage under specified input voltage and output load conditions, and 15% on the Oscillator frequency. External shutdown is included, featuring typically 80 ?A standby current. Self protection features include a two stage frequency reducing current limit for the output Switch and an over temperature shutdown for complete protection under fault conditions.
By National Semiconductor Corporation