DRV8835: Rds(on) when supplying 3V to VCC

Sadanori Kato

Part Number: DRV8835

Hi,

Could you please tell me "Rds(on) vs VM" about the following condition when supplying 3V to VCC ?
I have already filled it in for 3V@VM which is mentioned in DRV8835 data sheet.

Best regards,
Kato

over 8 years ago

0 Luis Riveros over 8 years ago

TI__Expert 4435 points

Hello Kato-san,

We will look into this and reply as soon as possible.

0 Sadanori Kato over 8 years ago in reply to Luis Riveros

Guru 36540 points

Hi Luis-san,

Thank you for your quick response.
I am looking forward to getting the information from you.

Best regards,
Kato

0 Rick Duncan over 8 years ago in reply to Luis Riveros

TI__Guru** 114905 points

Hi Kato-san,

The data was not collected at all of these points. Are there some points that you need more than others? Can you prioritize them?

0 Sadanori Kato over 8 years ago in reply to Rick Duncan

Guru 36540 points

Hi Rick-san,

Thank you for your support.
Can you provide only typical values for Rds(on) ?

Best regards,
Kato

0 Sadanori Kato over 8 years ago in reply to Sadanori Kato

Guru 36540 points

Hi Rick-san,

Could you please let me know if you have any updates on my request ?

Best regards,
Kato

0 Rick Duncan over 8 years ago in reply to Sadanori Kato

TI__Guru** 114905 points

Hi Kato-san,

I have been able locate VM=5V with VCC = 3V only. I need to discuss the data prior to sending it. I hope to be able to send the data tomorrow.

0 Sadanori Kato over 8 years ago in reply to Rick Duncan

Guru 36540 points

Hi Rick-san,

Thank you for your special support.
I am looking forward to getting the information for VM=1.5V, 2.0V, 2.5V and 5.0V from you.

Best regards,
Kato

0 Rick Duncan over 8 years ago in reply to Sadanori Kato

TI__Guru** 114905 points

Hi Kato-san,

As mentioned I was only able to find the following additional data at 25C.

RDSon, VCC = 3V, VM = 5V

Typ = 340 mOhm
Max = 385 mOhm

No data is available for the VM = 1.5V, 2.0V, 2.5V with VCC = 3V.

0 Sadanori Kato over 8 years ago in reply to Rick Duncan

Guru 36540 points

Hi Rick-san,

Thank you for your information.

I have one more request, so could you please tell me how to measure Rds(on) using the DRV8835EVM like your bench ?

Best regards,
Kato

0 Rick Duncan over 8 years ago in reply to Sadanori Kato

TI__Guru** 114905 points

Hi Kato-san,

Set the desired VCC and VM voltages. Perform each measurement separately.

Please note junction temperature will affect Rdson measurements. The measurements depend on proper thermal connections.

For high side:

Enable one output high with a load to gnd. Measure the voltage difference between VM and the output (VM-Vout). Measure or calculate the current through the load (Iload).

Divide (VM-Vout)/Iload

Repeat with other output

For low side:

Enable one output low with a load to VM. Measure the voltage difference between the output and GND pin (Vout -GND). Measure or calculate the current through the load (Iload).

Divide (Vout-GND)/Iload

Repeat with other output

0 Sadanori Kato over 8 years ago in reply to Rick Duncan

Guru 36540 points

Hi Rick-san,

Thank you for explaining so politely.
I understood.

Best regards,
Kato

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DRV8835: Rds(on) when supplying 3V to VCC