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LM2595J-ADJ-QML(5962-9650 Datasheet

  • LM2595J-ADJ-QML(5962-9650

  • SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage...

  • 29頁(yè)

  • NSC

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LM2595 SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
May 1999
LM2595
SIMPLE SWITCHER
廬
Power Converter 150 kHz
1A Step-Down Voltage Regulator
General Description
The LM2595 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 avail-
able in fixed output voltages of 3.3V, 5V, 12V, and an adjust-
able output version.
Requiring a minimum number of external components, these
regulators are simple to use and include internal frequency
compensation
鈥?/div>
, and a fixed-frequency oscillator.
The LM2595 series operates at a switching frequency of
150 kHz thus allowing smaller sized filter components than
what would be needed with lower frequency switching regu-
lators. Available in a standard 5-lead TO-220 package with
several different lead bend options, and a 5-lead TO-263
surface mount package. Typically, for output voltages less
than 12V, and ambient temperatures less than 50藲C, no heat
sink is required.
A standard series of inductors are available from several dif-
ferent manufacturers optimized for use with the LM2595 se-
ries. This feature greatly simplifies the design of
switch-mode power supplies.
Other features include a guaranteed
鹵
4% tolerance on out-
put voltage under specified input voltage and output load
conditions, and
鹵
15% on the oscillator frequency. External
shutdown is included, featuring typically 85 碌A(chǔ) stand-by cur-
rent. Self protection features include a two stage frequency
reducing current limit for the output switch and an over tem-
perature shutdown for complete protection under fault condi-
tions.
Features
n
3.3V, 5V, 12V, and adjustable output versions
n
Adjustable version output voltage range, 1.2V to 37V
鹵
4% max over line and load conditions
n
Available in TO-220 and TO-263 (surface mount)
packages
n
Guaranteed 1A 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, I
Q
typically 85 碌A(chǔ)
n
High efficiency
n
Uses readily available standard inductors
n
Thermal shutdown and current limit protection
Applications
n
n
n
n
Simple high-efficiency step-down (buck) regulator
Efficient pre-regulator for linear regulators
On-card switching regulators
Positive to negative converter
Note:
鈥?/div>
Patent Number 5,382,918.
Typical Application
(Fixed Output Voltage Versions)
DS012565-1
SIMPLE SWITCHER
廬
and
Switchers Made Simple
廬
are registered trademarks of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS012565
www.national.com

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