LM10011: IDAC_OUT impedance when unpowered or VDD=0V

Hi,

I would have think that it will be high impedance.
Maybe this sample design will helps. It uses 2 different supply for the LM10011 and the converter that it try to control
http://www.ti.com/tool/PMP9464

Thanks
-Arief

Hello Arief,

> Maybe this sample design will helps

Unfortunately not. In that design, even if the LM10011 was to load the FB pin, at some point it will recover once the independently powered LM10011's VDD becomes valid.

In order to prove this from existing designs, we would need the LM10011's VDD voltage becoming valid to be dependent on the ability of the converter, whose FB pin is being controlled by the LM10011, to bring its output into regulation.

Else, would it be possible to consult the design team, please?

Hello TI,

Will the LM10011 load the controlled DC/DC converter's FB pin when the LM10011 is unpowered or VDD is not yet valid, or will it be high-Z?

Hello TI,

Any response, please?