Bridge Drive Issue

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cross mob
User15455
Level 2
Level 2
10 sign-ins 5 sign-ins 10 replies posted
I run the board without load. PWM will stop due to over current.
Could the over current protection been disabled?
3596.attach
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8 Replies
pestadieu
Employee
Employee
Dear Peter Shi,

The overcurrent protection cannot be disabled.

However, the PWM is supposed to work without load. Try to increase the DS monitoring threshold, filter time and blanking time.
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User15455
Level 2
Level 2
10 sign-ins 5 sign-ins 10 replies posted
Hi Sir, I used the same software on different HW boards.
Only some boards are OK. Why this MCU(TL9879) has these difference?
Below thresholds should be OK for no load.

DS monitoring threshold: 0.75V
filter time: 2us
blanking time: 2us
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Fiz
Moderator
Moderator
Moderator
First like received 50 replies posted 25 replies posted
Hi Peter,

Which boards were you using?
Over current can also be caused when the active and free-wheeling MOSFET are turned on at the same time.
Try increasing the charge and discharge current of the bridge driver or increasing the cross-current-protection time.
Best,
Fiz
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User15455
Level 2
Level 2
10 sign-ins 5 sign-ins 10 replies posted
Fiz,
How much charger and discharge current do you recommend?
Could I use the max charge and discharge current?
When I try to increase the cross-current protection time, the Bridge damaged.
Why your company support is very slow?

Regards
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Lykaon
Employee
Employee
First like received
Hello PeterShi,
sorry the delay after your second post. We are working on your topic. In any cases you can contact our technical assistance center https://www.infineon.com/cms/en/about-infineon/company/contacts/product-support-form/?redirId=56193

Best regards
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Fiz
Moderator
Moderator
Moderator
First like received 50 replies posted 25 replies posted
Hi PeterShi,

Since you are using the TLE9879 Evalkit with the IPD90N04S4-05 you could use a charge/discharge current of at least 40mA to get fast switching.
You could use the max currents, but this will lead to high electromagnetic emissions and ringing both at the gate and source.
What did you experience when you increased the cross-current protection time?

Best,
Fiz
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User15455
Level 2
Level 2
10 sign-ins 5 sign-ins 10 replies posted
Fiz,

Thanks for your quick support. I have recevied relya from your technical assistance center.
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Fiz
Moderator
Moderator
Moderator
First like received 50 replies posted 25 replies posted
Hi PeterShi,

were you able to solve your problem?

Best,
Fiz
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