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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LM2574 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM2574 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
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1 / 24 page  LM2574/LM2574HV SIMPLE SWITCHER™ 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 ±4% tolerance on out- put voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 µA (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) ±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 Simple high-efficiency step-down (buck) regulator n Efficient pre-regulator for linear regulators n On-card switching regulators n Positive to negative converter (Buck-Boost) Typical Application (Fixed Output Voltage Versions) Patent Pending SIMPLE SWITCHER™ is a trademark of National Semiconductor Corporation DS011394-1 Note: Pin numbers are for 8-pin DIP package. June 1999 © 1999 National Semiconductor Corporation DS011394 www.national.com |
유사한 부품 번호 - LM2574 |
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유사한 설명 - LM2574 |
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