ZHCSLS8 August 2020 DRV5825P
The output stage of the DRV5825P uses a high-side NMOS driver, rather than a PMOS driver. To generate the gate driver voltage for the high-side NMOS, a bootstrap capacitor for each output terminal acts as a floating power supply for the switching cycle. Use 0.47-µF capacitors to connect the appropriate output pin (OUT_X) to the bootstrap pin (BST_X). For example, connect a 0.47-µF capacitor between OUT_A and BST_A for bootstrapping the A channel. Similarly, connect another 0.47-µF capacitor between the OUT_B and BST_B pins for the B channel inverting output.