High-Voltage Gate Driver IC with Integrated Bootstrap Diode for Trapezoidal and Sinusoidal Motor Control

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The IRS260xD’s bootstrap functionality is applicable not only to simple sinusoidal modulation schemes, but also to the more complex trapezoidal modulation schemes where the long-off-times of the low-side switch and extended tri-state conditions render bootstrap circuit design difficult. Thus, the IRS260xD family offers an excellent one-stop solution for appliance manufacturers with different PWM schemes.

The proprietary bootstrap functionality in IRS260xD delivers superior performance compared to competing solutions (see Figure 1). Under identical conditions, IRS2607 allows the bootstrap capacitor to maintain a much higher VBS voltage than competing devices, thus ensuring adequate gate drive to the MOSFET and IGBT with reduced conduction losses.

The IRS260xD also offers superior bootstrap functionality by maintaining higher VBS. Further, gate-drive input signal differentiation offered across the three devices in the IRS260xD family allows for a wide variety of microcontroller options.

 

Higher Reliability

The IRS260xD devices are part of the latest family of gate drivers designed to be the most rugged in the market for hard switching environments such as motion control circuits. The typical problem in voltage source inverters with inductive loads (as in the motion control domain) is that the hard switching generates negative voltage spikes whose amplitude and duration depend on the switches and on the layout of the application PCB. Each of these spikes occurs at PWM frequency, so in some operating conditions, they can occur 16000 times per second. In the IRS260xD datasheet, the Safe Operating Area for this HVIC under these conditions is specified.

 

 

Overall Benefits

• Reduced component count because the high voltage clamping diodes used in other solutions are no longer necessary
• Fewer field returns because the robust IR HVIC does not fail in an unpredictable manner unlike other solutions

Input filters have been re-designed to prevent small pulse commands reaching the gates of the switches in the inverter. This is one of the sources of problems in the field and usually it is difficult to find. The typical effect is that sometime inverters return from the field damaged with one destroyed leg without an apparent root cause. The IRS2607 embeds filters that solve this issue.

 

 

In addition, the IRS260xD family of HVICs offer dedicated UVLO protection for both the floating and fixed bias supplies, cross-conduction prevention logic [not RS2607D] for shoot-through immunity and matched propagation delay between channels for highest levels of safety.

 

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
IRS2607DSPBF		High-low Driver, HIN and LIN are Both Active High Polarity
IRS2608DSPBF		Half-bridge Driver, HIN is Active High Polarity, LIN is Active Low Polarity
IRS2609DSPBF		Half-bridge Driver, Dedicated Shut-down Pin with Active Low Polarity

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