Data Sheet

13
DRV8835
www.ti.com SLVSB18G –MARCH 2012–REVISED MAY 2016
Product Folder Links: DRV8835
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9 Power Supply Recommendations
9.1 Bulk Capacitance
The appropriate local bulk capacitance is an important factor in motor drive system design. More bulk
capacitance is generally beneficial, but may increase costs and physical size.
The amount of local capacitance needed depends on a variety of factors, including:
• The highest current required by the motor system
• The power supply’s capacitance and ability to source current
• The amount of parasitic inductance between the power supply and motor system
• The acceptable voltage ripple
• The type of motor used (brushed DC, brushless DC, stepper)
• The motor braking method
9.2 Power Supplies and Input Pins
There is a weak pulldown resistor (approximately 100 kΩ) to ground on the input pins.
VCC and VM may be applied and removed in any order. When VCC is removed, the device enters a low power
state and draws very little current from VM. To minimize current draw, keep the input pins at 0 V during sleep
mode.
The VM voltage supply does not have any undervoltage lockout protection (UVLO), so as long as VCC > 1.8 V,
the internal device logic remains active. This means that the VM pin voltage may drop to 0 V, however, the load
may not be sufficiently driven at low-VM voltages.