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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MLP2012S датащи(PDF) 10 Page - Seiko Instruments Inc |
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MLP2012S датащи(HTML) 10 Page - Seiko Instruments Inc |
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10 / 50 page  STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR S-8363 Series Rev.2.0_01 10 2. 3 Schottky barrier diode A schottky barrier diode (SD) is necessary to operate the S-8363 Series. The VOUT pin also works as the power supply pin. The voltage applied on the VOUT pin when OFF / ON = “L” is VIN − VD. VD is forward voltage for step-down of SD, and largely varies depending on the forward current If of SD and ambient temperature, but Vd is approx. 0.2 V to 0.5 V. When the S-8363 Series startups from 0.9 V, use a SD with specially low VD. When using CRS08 for the S-8363 Series, start-up is guaranteed when Ta = +25°C and a load current of 1 mA. Satisfy the following conditions when using other SDs. • Low forward voltage (VD) • High switching speed • Reverse withstand voltage of VOUT + spike voltage or more • Rated current of IPK or more Table 7 Typical Schottky Diodes Manufacturer Name TOSHIBA CORPORATION CRS02 CRS08 ROHM Co., Ltd. RB161M-20TR RB051LA-40TR RB070M-30TR RB161SS-20T2R Remark Generally, in diodes with low forward volage VD, reverse leakage current Ir tends to increases. Especially, increase of Ir in high temperature is significant. To prevent decrease in efficiency, choose a diode with low Ir when low voltage start-up is unnecessary. |
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