DRV8305_16 Datasheet, PDF (30/59 Pages) Texas Instruments – Three Phase Gate Driver

DRV8305
SLVSCX2B – AUGUST 2015 – REVISED FEBRUARY 2016
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7.3.9.2 Reverse Supply Protection
The DRV8305 is designed to support an external reverse supply protection scheme. The VCPH high-side charge
pump is able to supply an external load up to 10 mA. This feature allows implementation of an external reverse
battery protection scheme using a MOSFET and a BJT. The MOSFET gate and BJT can be driven through
VCPH with a current limiting resistor. The current limiting resistor must be sized not to exceed the maximum
external load on VCPH.
The VDRAIN sense pin may also be protected against reverse supply conditions by use of a current limiting
resistor. The current limit resistor must be sized not to exceed the maximum current load on the VDRAIN pin.
100 Ω is recommended between VDRAIN and the drain of the external high-side MOSFET.
Supply
Reverse Polarity MOSFET
VCPH
PVDD
Optional
Filtering or
Switch
VDRAIN
Motor
Power Stage
Figure 14. Typical Scheme for Reverse Battery Protection Using VCPH
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