Цена на дребно: 4 лв
Описание и технически параметри на линка:
http://www.national.com/ds/LM/LM2574.pdfMore Application Notes
AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment 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)
Sales and supply of electronic components, supplies direct from manufacturers.
Продажба и доставка на електронни елементи, директни доставки от производители.
За проверка на складови наличности и поръчки пишете на e-mail: plovdiv.services@gmail.com
За проверка на складови наличности и поръчки пишете на e-mail: plovdiv.services@gmail.com
Sales and supply of electronic components, supplies direct from manufacturers.
e-mail: plovdiv.services@gmail.com
Нови интегрални схеми и цени на линка : National Semiconductor
