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LM2596 датащи(PDF) 1 Page - First Components International

номер детали LM2596
подробное описание детали  Simple switcher Power Converter 150kHz Simple switcher Power Converter 150kHz
Download  14 Pages
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производитель  FCI [First Components International]
домашняя страница  http://www.cotra.com.tw/
Logo FCI - First Components International

LM2596 датащи(HTML) 1 Page - First Components International

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1
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, 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 UA 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
• 3.3V, 5V, 12V, and adjustable output versions
• Adjustable version output voltage range, 1.2V to 37V
• ±4% max over line and load conditions
• Available in TO-220 and TO-263 packages
• Guaranteed 3A output load current
• Input voltage range up to 40V
• Requires only 4 external components
• Excellent line and load regulation specifications
• 150 kHz fixed frequency internal oscillator
• TTL shutdown capability
• Low power standby mode, IQ typically 80 UA
• High efficiency
• Uses readily available standard inductors
• Thermal shutdown and current limit protection
APPLICATIONS
• Simple high-efficiency step-down (buck) regulator
• On-card switching regulators
• Positive to negative converter
TYPICAL APPLICATION (Fixed Output Voltage Versions)
BLOCK DIAGRAM
+VIN
LM2596
5.0
+
CIN
680 F
µ
L1
220 F
µ
COUT
+
12V
1
2
3
4
5
5.0V
+
-
+
-
150kHz
OSC
Active
capacitor
AMP
+
-
LATCH
DRIVER
COM
COM
-
+
-
+
START
UP
+
+
GM
R2
2.5V
FEEDBACK
ON/OFF
V
IN
OUTPUT
GND
LM2596 Simple switcher Power Converter 150kHz
3A Step-Down Voltage Regulator


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