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LM2575BN 数据表(PDF) 1 Page - Micrel Semiconductor |
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LM2575BN 数据表(HTML) 1 Page - Micrel Semiconductor |
1 / 12 page LM2575 52kHz Simple 1A Buck Regulator Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( 408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com May 2009 1 M9999-051209-B General Description The LM2575 series of monolithic integrated circuits provide all the active functions for a step-down (buck) switching regulator. Fixed versions are available with a 3.3V, 5V, 12V, fixed output. Adjustable versions have an output voltage range from 1.23V to 37V. Both versions are capable of driving a 1A load with excellent line and load regulation. These regulators are simple to use because they require a minimum number of external components and include internal frequency compensation and a fixed-frequency oscillator. The LM2575 series offers a high efficiency replacement for popular three-terminal adjustable linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required. A standard series of inductors available from several different manufacturers are ideal for use with the LM2575 series. This feature greatly simplifies the design of switch- mode power supplies. The feedback voltage is guaranteed to ±2% tolerance for adjustable versions, and the output voltage is guaranteed to ±3% for fixed versions, within specified input voltages and output load conditions. The oscillator frequency is guaranteed to ±10%. External shutdown is included, featuring less than 200µA standby current. The output switch includes cycle-by-cycle current limiting and thermal shutdown for full protection under fault conditions. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. Features • 3.3V, 5V, 12V, and adjustable output versions • Voltage over specified line and load conditions: – Fixed version: ±3% max. output voltage – Adjustable version: ±2% max. feedback voltage • Guaranteed 1A output current • Wide input voltage range – 4V to 40V • Wide output voltage range – 1.23V to 37V • Requires only 4 external components • 52kHz fixed frequency internal oscillator • Low power standby mode IQ typically <200µA • 80% efficiency (adjustable version typically >80%) • Uses readily available standard inductors • Thermal shutdown and current limit protection • 100% electrical thermal limit burn-in Applications • Simple high-efficiency step-down (buck) regulator • Efficient pre-regulator for linear regulators • On-card switching regulators • Positive to negative converter (inverting Buck-Boost) • Isolated flyback converter using minimum number of external components • Negative boost converter ___________________________________________________________________________________________________________ Typical Applications 7V–40V Unregulated DC Input LM2575-5.0 + CIN 100µF +VIN 1 3 Gnd 5 On/Off 2 Output 4 Feedback L1 330µH + D1 1N5822 COUT 330µF +5V, 1A Regulated Output Note: Pin numbers are for TO-220 Package R2 R1 7V–40V Unregulated DC Input LM2575 + CIN 100µF +VIN 1 3 Gnd 5 On/Off 2 Output 4 Feedback L1 330µH + D1 1N5822 COUT 330µF R2 3.09k R1 1k VOUT = 1.23 1 + () +5V, 1A Regulated Output Note: Pin numbers are for TO-220 Package Fixed Regulation in Typical Application Adjustable Regulation in Fixed Output Application |
类似零件编号 - LM2575BN |
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类似说明 - LM2575BN |
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