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IRS2609DSPbF
Integrated Bootstrap Functionality
The IRS2609D embeds an integrated bootstrap FET that allows an alternative drive of the bootstrap supply for a wide range of
applications. A bootstrap FET is connected between the floating supply V B and V CC (see Fig. 10).
Vcc
BootFet
Vb
Figure 10: Semplified BootFET connection
The integrated bootstrap feature can be used either in parallel with the external bootstrap network (diode and resistor) or as
a replacement of it. The use of the integrated bootstrap as a replacement of the external bootstrap network may have some
limitations at very high PWM duty cycle, corresponding to very short LIN pulses, due to the bootstrap FET equivalent
resistance RBS.
The summary for the bootstrap state follows:
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Bootstrap turns-off (immediately) or stays off when at least one of the following conditions are met :
1- /SD is low
2- /SD is high, IN is low and V B is high (> 1.1*V CC )
3- /SD is high, IN is high (DT period excluded)
4- /SD is high, IN is high and V B is high (> 1.1*V CC ) (during DT period)
Bootstrap turns-on when :
1- /SD in high, IN is low and V B is low (< 1.1(V CC ))
2- /SD in high, IN is high and V B is low (< 1.1(V CC )) (during the DT period). Please refer to the BootFET timing
diagram for more details.
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