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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6730B датащи(PDF) 30 Page - STMicroelectronics |
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L6730B датащи(HTML) 30 Page - STMicroelectronics |
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30 / 52 page  Device description L6730 - L6730B 30/52 Doc ID 11938 Rev 3 5.14 Bootstrap anti-discharging system This built-in anti-discharging system keeps the voltage going across the bootstrap capacitor from going below 3.3 V. An internal comparator senses the voltage across the external bootstrap capacitor and helps to keep it charged, eventually turning on the low-side MOSFET for approximately 200 ns. If the bootstrap capacitor is not charged up enough, the high-side MOSFET cannot be effectively turned on and it will present a higher RDS(on). In some cases, the OCP can be also triggered. There are up to two conditions during which the bootstrap capacitor can be discharged: ● fan power supply failure, and ● no sink at zero current operation. Figure 25. 14 V -> 0.5 V@820 kHz, 5 A 50ns |
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