Hi Yamamoto-san,
Q1 + Q2:
To calculate power dissipation in the device at specific IDRIVE settings, you can use the following equations:
GL_PWR: IDRV x PVDD x (∆T/T_PWM)
GH_PWR: IDRV x (2xPVDD) x (∆T/T_PWM)
Where:
GL_PWR = Gate Low Power Dissipation
GH_PWR = Gate High Power Dissipation
IDRV = IDRIVE Current Setting
PVDD = Device Supply Voltage
∆T = Actual Slew Rate in your application, so the time from when the MOSFET is off to when it is fully turned on (VGS = VCP)
T_PWM = Period of your PWM frequency
Q3: Accuracy will be slightly degraded, but the device will still function properly across each channel.
For more information on our IDRIVE / TDRIVE technology, we have an app note available here for review:
www.ti.com/.../slva714a.pdf
Q1 + Q2:
To calculate power dissipation in the device at specific IDRIVE settings, you can use the following equations:
GL_PWR: IDRV x PVDD x (∆T/T_PWM)
GH_PWR: IDRV x (2xPVDD) x (∆T/T_PWM)
Where:
GL_PWR = Gate Low Power Dissipation
GH_PWR = Gate High Power Dissipation
IDRV = IDRIVE Current Setting
PVDD = Device Supply Voltage
∆T = Actual Slew Rate in your application, so the time from when the MOSFET is off to when it is fully turned on (VGS = VCP)
T_PWM = Period of your PWM frequency
Q3: Accuracy will be slightly degraded, but the device will still function properly across each channel.
For more information on our IDRIVE / TDRIVE technology, we have an app note available here for review:
www.ti.com/.../slva714a.pdf