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LTC3453 датащи(PDF) 14 Page - Linear Technology |
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LTC3453 датащи(HTML) 14 Page - Linear Technology |
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14 / 20 page ![]() LT3474/LT3474-1 14 3474fd APPLICATIONS INFORMATION Diode Selection The catch diode (D1 from Figure 1) conducts current only during switch off time. Average forward current in normal operation can be calculated from: I IV V V DAVG OUT IN OUT IN () = () – The only reason to consider a diode with a larger current rating than necessary for nominal operation is for the worst-case condition of shorted output. The diode cur- rent will then increase to one half the typical peak switch current. Peak reverse voltage is equal to the regulator input voltage. Use a diode with a reverse voltage rating greater than the input voltage. If using the PWM mode of the LT3474, select a diode with low reverse leakage. Table 4 lists several Schottky diodes and their manufacturers. Table 4. Schottky Diodes PART NUMBER VR (V) IAVE (A) VF at 0.5A (mV) VF at 1A (mV) On Semiconductor MBR0520L 20 0.5 385 MBR0540 40 0.5 510 620 MBRM120E 20 1 530 MBRM140 40 1 550 Diodes Inc. B0530W 30 0.5 430 B120 20 1 500 B130 30 1 500 B140 HB 40 1 530 International Rectifier 10BQ030 30 1 420 |
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