8.3.1.2.1 Slew Rate

An adjustable gate-drive current control to the MOSFETs of half-bridges is implemented to achieve the slew rate control. The MOSFET VDS slew rates are a critical factor for optimizing radiated emissions, energy and duration of diode recovery spikes and switching voltage transients related to parasitics. These slew rates are predominantly determined by the rate of gate charge to internal MOSFETs as shown in Figure 40.

Figure 40. Slew Rate Circuit Implementation

The slew rate of each half-bridge can be adjusted by HBX_SR bits in Slew Rate control register (SR_CTRL_1 and SR_CTRL_2). Each half-bridge can be selected to a slew rate of 0.6-V/µs or 2.5-V/µs. The slew rate is calculated by the rise-time and fall-time of the voltage on OUTx pin as shown in Figure 41. The slew rate (SR) is calculate as shown in

Figure 41. Slew Rate Timings