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你认真看下原厂的pdf4.5,写得很清楚了。
Bootstrap capacitor
For compatibility purpose with the previous devices of the family, the bootstrap capacitor can
be connected either between the bootstrap pin (6) and the output pin (14) or between the
bootstrap pin (6) and the bootstrap loader pin (12).
When the bootstrap is connected between pins 6 and 14 the maximum supply voltage in the
presence of an output signal is limited to 100 V, due the bootstrap capacitor overvoltage.
When the bootstrap is connected between pins 6 and 12 the maximum supply voltage
extends to the full voltage that the technology can stand, in this case 120 V.
This is accomplished by the clamp introduced at the bootstrap loader pin (12). This pin
follows the output voltage up to 100 V and remains clamped at 100 V for higher output
voltages.
This feature lets the output voltage swing up to a gate-source voltage from the positive supply (VS -3 to 6 V). |
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