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Science Forum Index » Electronics - Design Forum » LM2596S-12 data...
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 Posted: Thu May 08, 2008 4:03 pm |
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General Description
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$B"w(B, 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 $B!^(B4% tolerance on
output voltage under specified input voltage and output load
conditions, and $B!^(B15% on the oscillator frequency. External shutdown is
included, featuring typically 80 $B&L(BA 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.
Features
n 3.3V, 5V, 12V, and adjustable output versions
n Adjustable version output voltage range, 1.2V to 37V
$B!^(B4% max over line and load conditions
n Available in TO-220 and TO-263 packages
n Guaranteed 3A output load current
n Input voltage range up to 40V
n Requires only 4 external components
n Excellent line and load regulation specifications
n 150 kHz fixed frequency internal oscillator
n TTL shutdown capability
n Low power standby mode, IQ typically 80 $B&L(BA
n High efficiency
n Uses readily available standard inductors
n Thermal shutdown and current limit protection
Applications
n Simple high-efficiency step-down (buck) regulator
n On-card switching regulators
n Positive to negative converter
Note: $B"w(BPatent Number 5,382,918.
http://www.chinaicmart.com/suppliers/509/LM2596S-12.html |
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