THS3491: Max Quiescent Current

Takumi Suzuki1

Mastermind 8610 points

Part Number: THS3491

Hi,

Let me ask you a question about "Max Iq" value as below.

There described the value is 16.3mA (at Vs=+/-7V) on the datasheet page7.

In case Vs=+/-10V, how much current can we estimate?

And about the value, can I understand that 16.3mA means "8.15mA/+7V, 8.15mA/-7V" not "16.3mA/+7V, 16.3mA/-7V"?

Thanks for your support.

Best Regards,

Takumi

over 4 years ago

+1 Michael Steffes over 4 years ago

Guru 48395 points

So Takumi-san

The quiescent current is with no input signal and flows from one supply to the other assuming no load current. That 16.3mA would flow from V+ to V- supplies.

Normally, the designs hold a relatively constant supply current over temp with a high apparent impedance across the supplies. You could calculate that impedance from the max supply at +/-7V to the max supply current at +/-15V and interpolate a spec at any set of supplies from the apparent resistance across the supplies (model this as a current source in parallel with a high R value)

+1 Sima Jalaleddine over 4 years ago

TI__Mastermind 29670 points

Hello Takumi-san,

Looks to be a semi- linear relationship, the typical quiescent current for this device at Vs= +/-10V would be around 16.1-16.2mA. But Michael's method would give you accurate results to your configuration.

Thank you,

Sima

0 Takumi Suzuki1 over 4 years ago in reply to Michael Steffes

Mastermind 8610 points

Hi Michael-san,

Thank you very much for your reply!

I understood.

Best Regards,

Takumi

0 Takumi Suzuki1 over 4 years ago in reply to Sima Jalaleddine

Mastermind 8610 points

Hi Sima-san,

Thank you so much for your kindness!

I understood.

Best Regards,

Takumi

Amplifiers

Amplifiers forum

THS3491: Max Quiescent Current