четвъртък, 29 септември 2011 г.

LM2574N-ADJ SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator Стабилизатор на напрежение: регулируем; 500mA; 1,23V÷37V; DIP8

LM2574N-ADJ SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator  Стабилизатор на напрежение: регулируем; 500mA; 1,23V÷37V; DIP8
Цена на дребно: 3 лв
Описание и технически параметри на линка:
LM2574/LM2574HV SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
 
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AN-946: Application Note 946 High-Efficiency 3A Battery Chargers Use LM2576 Regulators


 
Features
   3.3V, 5V, 12V, 15V, and adjustable output versions
   Adjustable version output voltage range, 1.23V to 37V (57V for HV version) ±4% max over line and load conditions
   Guaranteed 0.5A output current
   Wide input voltage range, 40V, up to 60V for HV version
   Requires only 4 external components
   52 kHz fixed frequency internal oscillator
   TTL shutdown capability, low power standby mode
   High efficiency
   Uses readily available standard inductors
   Thermal shutdown and current limit protection 


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 ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

Applications
   Simple high-efficiency step-down (buck) regulator
   Efficient pre-regulator for linear regulators
   On-card switching regulators
   Positive to negative converter (Buck-Boost)

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