LM134: Higher Output Current Configuration

EE_MT

Part Number: LM134

Is there any literature/more information on C1 and R1 value calculation in the LM134 datasheet, Figure 20: Higher Current Output configuration? I'm planning on using this current source to output 15mA.

Here's the datasheet link:

Thanks

over 6 years ago

0 Wade Vonbergen over 6 years ago

TI__Guru 62930 points

MT,
The engineer that supports this device is currently out of the country.
He, or someone else should be able to reply soon. Thanks,
Wade

0 Kirby Kruckmeyer96848 over 6 years ago in reply to Wade Vonbergen

TI__Genius 17035 points

Hello MT,
I do not know of any additional information or guidance on this. I will be searching the archives to see if we have anything helpful. It may take until early next week before I have a final answer.

0 EE_MT over 6 years ago in reply to Kirby Kruckmeyer96848

Intellectual 390 points

Kirby,

Thank you.

Also, will 2 LM134 in parallel work similar to using a transistor to increase the current output?

0 EE_MT over 6 years ago in reply to Kirby Kruckmeyer96848

Intellectual 390 points

Did you get a chance to look into this?

0 Kirby Kruckmeyer96848 over 6 years ago in reply to EE_MT

TI__Genius 17035 points

I have not been able to find additional applications information yet. There is one more source for archives I am still working on that looks promising. I hope to have that info by the end of the week. The part was released over 40 years ago and I haven't seen this question come up recently.

0 Kirby Kruckmeyer96848 over 6 years ago in reply to Kirby Kruckmeyer96848

TI__Genius 17035 points

Hi MT,
I have not been able to find any additional guidance on choosing the resistors and cap. In this configuration, you are basically using the LM134 as constant current sink for the base of a pnp transistor. The resistors need to be choosen based on the application.

We do not suggest putting two LM134s in parallel as this could impact the stability of the parts.

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LM134: Higher Output Current Configuration