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LM3557 Folha de dados(PDF) 1 Page - National Semiconductor (TI) |
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LM3557 Folha de dados(HTML) 1 Page - National Semiconductor (TI) |
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1 / 11 page  LM3557 Step-Up Converter for White LED Applications General Description The LM3557 is a complete solution for white LED drive applications. With minimal external component count, no DC current leakage paths to ground, cycle-by-cycle current limit protection, and output over-voltage protection circuitry, the LM3557 offer superior performance and cost savings over standard DC/DC boost component implementations. The LM3557 switches at a fixed-frequency of 1.25 MHz, which allows for the use of small external components. Also, the LM3557 has a wide input voltage range to take advan- tage of multi-cell input applications. With small external com- ponents, high fixed frequency operation, and wide input voltage range, the LM3557 is the most optimal choice for LED lighting applications. Features n V IN Range: 2.7V–7.5V n Small External Components n 1.25 MHz Constant-Switching Frequency n Output Over-Voltage Protection n Input Under-Voltage Protection n Cycle-By-Cycle Current Limit n TRUE SHUTDOWN: No DC current paths to ground during shutdown n Low Profile Package: <1 mm Height -8 Pin LLP n No External Compensation Applications n White LED Display Lighting n Cellular Phones n PDAs Typical Application Circuit 20131601 FIGURE 1. Backlight Configuration November 2004 © 2004 National Semiconductor Corporation DS201316 www.national.com |
Nº de peça semelhante - LM3557 |
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Descrição semelhante - LM3557 |
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