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IRS2609DSPBF Datasheet(PDF) 10 Page - International Rectifier |
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IRS2609DSPBF Datasheet(HTML) 10 Page - International Rectifier |
10 / 25 page www.irf.com 10 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 VB and VCC (see Fig. 10). 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: • 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 VB is high (> 1.1*VCC) 3- /SD is high, IN is high (DT period excluded) 4- /SD is high, IN is high and VB is high (> 1.1*VCC) (during DT period) • Bootstrap turns-on when : 1- /SD in high, IN is low and VB is low (< 1.1(VCC)) 2- /SD in high, IN is high and VB is low (< 1.1(VCC)) (during the DT period). Please refer to the BootFET timing diagram for more details. Vcc Vb BootFet |
Similar Part No. - IRS2609DSPBF_15 |
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Similar Description - IRS2609DSPBF_15 |
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