LM4865: HP-Sense Resistor

user4950766

Part Number: LM4865

Dear sir,
I have a question for HP-Sence line.
Referring to Figure 3 of Datasheet, there is a Rs resistor (100kohm) on the HP-Sense line.
But in Figure 30,that resistor does not exist.
Which is correct, with or without RS resistor?

Regards,
S Ko

over 5 years ago

0 Luis Fernando Rodriguez S. over 5 years ago

TI__Guru* 84915 points

Hi, S Ko,

Welcome to E2E and thank you for your interest in our products!

Please use the connection of figure 30, it is included in the HP-Sense Function section. So, this is the correct circuitry.

Best regards,
Luis Fernando Rodríguez S.

0 user4950766 over 5 years ago in reply to Luis Fernando Rodriguez S.

Prodigy 60 points

Hi,

Thank you for your reply.

I think many users are using the circuit in Figure 3.(with RS)

If so, does the HP-Sense function work correctly?

Is it possible to sense low voltage levels with the circuit in Figure 3?

Best Regards,
S Ko

0 Luis Fernando Rodriguez S. over 5 years ago in reply to user4950766

TI__Guru* 84915 points

Hi, S Ko,

I confirmed that there's no problem if the HP Sense pin is used or not. I would say that the difference is in the pin current consumption. But there's no difference in the device behavior.

Best regards,
Luis Fernando Rodríguez S.

0 user4950766 over 5 years ago in reply to Luis Fernando Rodriguez S.

Prodigy 60 points

Hi, Luis,

Thank you for your reply.

I would like to reconfirm,

does the HP function work correctly with or without(short) the RS(100Kohm) resistor?

The only difference is power consumption, isn't it?

Best Regards,
S Ko

0 Luis Fernando Rodriguez S. over 5 years ago in reply to user4950766

TI__Guru* 84915 points

Hi, S Ko,

Yes, this is correct. The device works correctly with and without the RS resistor. The current consumption is the only difference.

Best regards,
Luis Fernando Rodríguez S.

0 user4950766 over 5 years ago in reply to Luis Fernando Rodriguez S.

Prodigy 60 points

Hi, Luis,

Thank you for your helpful comments.

I will use it as a reference.

Best Regards,

S Ko

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LM4865: HP-Sense Resistor