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LM3402 数据表(PDF) 8 Page - National Semiconductor (TI) |
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LM3402 数据表(HTML) 8 Page - National Semiconductor (TI) |
8 / 18 page Modified Application Circuit Design Example 3 Design Example 1 • V IN = 48V (±20%) • Driving 3, 4, or 5 HB LEDs with V F = 3.4V • I F = 500 mA (typical application) • Estimated efficiency = 82% • f SW = fast as possible • Design for typical application within t ON and tOFF limitations The inductor, R ON resistor, and the RSNS resistor are calcu- lated for a typical or average design. • V OUT = 3 x 3.4V + 200 mV = 10.4V • V OUT = 4 x 3.4V + 200 mV = 13.8V • V OUT = 5 x 3.4V + 200 mV = 17.2V Calculate t ON, tOFF & RON Minimum ON time occurs when V IN is at its maximum value, and V OUT is at its lowest value. Calculate R ON at VIN = 60V, VOUT = 10.4V, and set tON = 300 ns: R ON = 111 kΩ (113 kΩ) tON = 306 ns Check to see if t OFF minimum is satisfied. At V IN = 36V, VOUT = 17.2V, and RON = 113 kΩ calculate t ON:. t ON = 806 ns t OFF = 577 ns (satisfied) 30061637 FIGURE 9. Improved Average LED Current Application Circuit www.national.com 8 |
类似零件编号 - LM3402 |
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类似说明 - LM3402 |
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