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IRS2608DSPBF Datasheet(PDF) 11 Page - International Rectifier |
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IRS2608DSPBF Datasheet(HTML) 11 Page - International Rectifier |
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11 / 26 page  www.irf.com 11 IRS2608DSPbF Integrated Bootstrap Functionality The IRS2608D 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. 8). Figure 8: Semplified BootFET connection The bootstrap FET is suitable for most PWM modulation schemes, including trapezoidal control, and can be used either in parallel with the external bootstrap network (diode+ 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 in the following situations: • When the motor runs at a very low current (so that the negative phase voltage decay can be longer than 20us) and complementary PWM is not used. • At a very high PWM duty cycle due to the bootstrap FET equivalent resistance (RBS, see page 3). 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- HO goes/is high 2- VB goes/is high (> 1.1*VCC) • Bootstrap turns-on when : 1- LO is high (low side is on) AND VB is low (< 1.1(VCC)) 2- LO and HO are low after a LIN transition from H to L (HB output is in tri-state) AND VB goes low (<1.1*VCC) before a fixed time of 20us. 3- LO and HO are low after a HIN transition from H to L (HB output is in tri-state) AND VB goes low (<1.1(VCC)) before a retriggerable time of 20us. In this case the time counter is kept in reset state until VB goes high (>1.1VCC). Please refer to the BootFET timing diagram for more details. Vcc Vb BootFet |
Similar Part No. - IRS2608DSPBF_15 |
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Similar Description - IRS2608DSPBF_15 |
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