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L6730B データシート(PDF) 30 Page - STMicroelectronics

部品番号 L6730B
部品情報  Adjustable step-down controller with synchronous rectification
PDF  52 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6730B データシート(HTML) 30 Page - STMicroelectronics

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Device description
L6730 - L6730B
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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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