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ZHCSN76B January 2021 – April 2022 DRV8316

PRODUCTION DATA

封裝選項

機械數據 (封裝 | 引腳)

RGF|40
- MPQF173F

散熱焊盤機械數據 (封裝 | 引腳)

RGF|40
- QFND672

訂購信息

9.2.1.1.3 Driver Propagation Delay and Dead Time

Driver propagation delay (t_PD) and dead time (t_dead) is specified with a typical and maximum value, but not with a minimum value. This is due to the direction of current at the OUTx pin when synchronous inputs are switching. Driver propagation delay and dead time can be shorter than typical values due to slower internal turn-ons of the high-side or low-side internal MOSFETs to avoid internal dV/dt coupling.

For more information and examples of how propagation delay and dead time differs for input PWM and output configurations, please visit the Delay and Dead Time in Integrated MOSFET Drivers application note.

The dead time from the microcontroller’s PWM outputs can be used as an extra precaution in addition to the DRV8316 internal shoot-through protection. This creates a condition where internal logic prioritizes the MCU dead time or driver dead time based on their durations.

If the MCU dead time is less than the driver dead time, the driver will compensate and make the true output dead time the value specified by the DRV8316. If the MCU inserted dead time is larger than the driver dead time, then the DRV8316 will adjust accordingly to the MCU dead time as shown in the table below.

A summary of the device delay times with respect to synchronous inputs INHx and INLx, OUTx current direction, and inserted MCU dead time are shown in Table 9-2.

Table 9-2 Summary of delay times in integrated FET devices depending on inputs and output current direction

OUTx current direction	INHx	INLx	Propagation Delay (t_PD)	Dead Time (t_dead)	Inserted MCU dead time (t_dead(MCU))
OUTx current direction	INHx	INLx	Propagation Delay (t_PD)	Dead Time (t_dead)	t_dead(MCU) < t_dead	t_dead(MCU) > t_dead
Out of OUTx	Rising	Falling	Typical	Typical	Output dead time = t_dead	Output dead time = t_dead(MCU)
Out of OUTx	Falling	Rising	Smaller than typical	Smaller than typical	Output dead time < t_dead	Output dead time < t_dead(MCU)
Into OUTx	Rising	Falling	Smaller than typical	Smaller than typical	Output dead time < t_dead	Output dead time < t_dead(MCU)
Into OUTx	Falling	Rising	Typical	Typical	Output dead time = t_dead	Output dead time = t_dead(MCU)