LM74502: Use with two power sources

Hirotsugu Kobayashi

Part Number: LM74502

Tool/software:

Hi team,

Is it possible to use the IC's operating power supply and the controlling power supply separately as shown in the attached diagram?

1 month ago

0 Shiven Dhir 1 month ago

TI__Mastermind 18100 points

Hi Kobaya,

We cannot do this.

What are the features that you are looking for?

Regards,

Shiven Dhir

0 Hirotsugu Kobayashi 1 month ago in reply to Shiven Dhir

Mastermind 8965 points

Hi Sheven,

The function I want is a high-side driver.

I want to control 0.6 to 4V, but since the load may be shorted, I am looking for a high-side driver with an external FET rather than a load switch.

0 Shiven Dhir 1 month ago in reply to Hirotsugu Kobayashi

TI__Mastermind 18100 points

Hi Kobayashi,

I don't think we have a solution that can be driven to as low as 0.6V. Our high side switches do not have an external supply driving capability as you showed in the diagram.

Regards,

Shiven Dhir

0 Hirotsugu Kobayashi 1 month ago in reply to Shiven Dhir

Mastermind 8965 points

Hi Shiven,

Looking at the block diagram, it looks like the gate voltage should be generated based on the SRC standard, but does VS and SRC need to be the same voltage?

+1 Shiven Dhir 1 month ago in reply to Hirotsugu Kobayashi

TI__Mastermind 18100 points

Hi Kobayashi,

VCAP is driven with respect to VS and GATE is driven with respect to SRC. GATE follows whatever the VCAP voltage is. Hence VS and SRC should be same voltage

Regards,

Shiven Dhir

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LM74502: Use with two power sources