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LM2574HVN-ADJ Datasheet

  • LM2574HVN-ADJ

  • SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator

  • 24頁(yè)

  • NSC

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LM2574/LM2574HV SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
June 1999
LM2574/LM2574HV
SIMPLE SWITCHER
鈩?/div>
0.5A Step-Down Voltage Regulator
General Description
The LM2574 series of regulators are monolithic integrated
circuits that provide all the active functions for a step-down
(buck) switching regulator, capable of driving a 0.5A 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 components, these
regulators are simple to use and include internal frequency
compensation and a fixed-frequency oscillator.
The LM2574 series offers a high-efficiency replacement for
popular three-terminal linear regulators. Because of its high
efficiency, the copper traces on the printed circuit board are
normally the only heat sinking needed.
A standard series of inductors optimized for use with the
LM2574 are available from several different manufacturers.
This feature greatly simplifies the design of switch-mode
power supplies.
Other features include a guaranteed
鹵
4% tolerance on out-
put voltage within specified input voltages and output load
conditions, and
鹵
10% on the oscillator frequency. External
shutdown is included, featuring 50 碌A(chǔ) (typical) standby cur-
rent. The output switch includes cycle-by-cycle current limit-
ing, as well as thermal shutdown for full protection under
fault conditions.
Features
n
3.3V, 5V, 12V, 15V, and adjustable output versions
n
Adjustable version output voltage range, 1.23V to 37V
(57V for HV version)
鹵
4% max over line and load
conditions
n
Guaranteed 0.5A output current
n
Wide input voltage range, 40V, up to 60V for HV version
n
Requires only 4 external components
n
52 kHz fixed frequency internal oscillator
n
TTL shutdown capability, low power standby mode
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 (Buck-Boost)
Typical Application
(Fixed Output Voltage Versions)
DS011394-1
Note:
Pin numbers are for 8-pin DIP package.
Patent Pending
SIMPLE SWITCHER
鈩?/div>
is a trademark of National Semiconductor Corporation
漏 1999 National Semiconductor Corporation
DS011394
www.national.com

LM2574HVN-ADJ 產(chǎn)品屬性

  • National Semiconductor (TI)

  • 1.23 V to 57 V

  • 0.5 A

  • 58 KHz

  • Through Hole

  • PDIP-8

  • Tube

  • 1

  • 40

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