SLASEG6B May 2018 – June 2020 TAS3251
TAS3251 has built-in bootstrap supply for each half bridge gate drive to supply the high side MOSFETs, only requiring a single capacitor per half bridge. The capacitors are connected to each half bridge output and charged by the GVDD supply via an internal diode while the PWM outputs are in low state. The high side gate drive is supplied by the voltage across the BST capacitor while the output PWM is high. It is recommended to place the BST capacitors close to the TAS3251 device and keep the length of PCB traces to a minimum. Connect a 0.033 µF ceramic capacitor with a rating of at least 25V between BST_xx pin and the corresponding output stage SPK_OUTxx pin.