Maximum output current value of PWM, TIM
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‎2017-09-16 9:18 AM
Sorry for my poor English.
What is the maximum output current value of PWM using TIM? Where can I find it in the data sheet? I am using STM32F334. I am investigating whether the MOSFET can be directly driven by the PWM from the microcomputer without the gate driver.
On page 78/121 of the data sheet of STM32F334x4 STM32F334x6 STM32F334x8, the following description was given
Is IIO=8mA, 20mA the PWM maximum output current value? Which is 8 mA or 20 mA?
Best Regards,
Ken Inoue
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‎2017-09-16 12:15 PM
Hi Ken
>>>I am investigating whether the MOSFET can be directly driven by the PWM
Driving MOSFETs its not a static condition to make calculations with currents only. MOSFET's Gate has very high Ohmic resistance. Load Capacitance of Gate, and Frequency are the main factors to decide to drive a MOSFET (also min GateSource threshold voltage must be <VCC)
In dynamic conditions like you described , the appropriate table of DataSheet to look at, is
Regards
vf
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‎2017-09-16 9:40 AM
It's a CONDITION, that impacts the high/low voltage outputs. ie you draw more current the further VOL gets from zero
Look at the current tables, with max per pin, and max total across all pins.
Up vote any posts that you find helpful, it shows what's working..
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‎2017-09-16 12:15 PM
Hi Ken
>>>I am investigating whether the MOSFET can be directly driven by the PWM
Driving MOSFETs its not a static condition to make calculations with currents only. MOSFET's Gate has very high Ohmic resistance. Load Capacitance of Gate, and Frequency are the main factors to decide to drive a MOSFET (also min GateSource threshold voltage must be <VCC)
In dynamic conditions like you described , the appropriate table of DataSheet to look at, is
Regards
vf
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‎2017-09-17 8:03 PM
Dear
Mr./Ms.
Clive OneThank you for your reply.
You mean that as more current flows, Vol increases.
Best Regards,
Ken Inoue
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‎2017-09-17 8:07 PM
Dear
Mr./Ms.
Vangelis Fortounas
Thank you for your reply.
The MOSFET I use can be driven at 2.5 V, Ciss = 15 pF. And I want to operate the MOSFET at around 100 kHz. Therefore it seems possible to drive without gate driver.
Best Regards,
Ken Inoue
