TLK105RHB / LED interface sink, source current and recommended land pattern

Ryuji

Guru 20090 points

Other Parts Discussed in Thread: TLK105

Hello,

I have the some questions about TLK105RHB.

(1) LED Interface

Could you please let me know the maximum sink and source current of LED interface pins ?

(2) Recommended Land Pattern

Please kindly send the recommended land pattern that you can share with us.

I can't find that data from datasheet.

Best Regards,

Ryuji Asaka

over 12 years ago

0 Patrick OFarrell over 12 years ago

TI__Mastermind 31600 points

The CAD symbol for the TLK105 can be found on the Webench CAD site:

http://webench.ti.com/cad/

I will check on the information for the LED drivers.

Patrick

0 Ryuji over 12 years ago in reply to Patrick OFarrell

Guru 20090 points

Hello Patrick san,

Thank you for the reply.I will be waiting for your reply about LED drivers.

Best Regards,

Ryuji Asaka

0 aviad over 12 years ago in reply to Ryuji

TI__Intellectual 2000 points

Hello Asaka-san,

Typical value for source & sink through the led buffers is 4mA. i will look for the max values for you.

Thanks,

Aviad

0 Ryuji over 12 years ago in reply to aviad

Guru 20090 points

Hello Aviad san,

Thank you for the reply.

I will be waiting for the max values.

Best Regards,

Ryuji Asaka

0 Ryuji over 12 years ago in reply to Ryuji

Guru 20090 points

Hello Aviad san,

Sorry for bothering you.

Can we use this device with 20mA LED current?

Our customer would like to use as 20mA LED current.
If no , do you have any application for 20mA LED drive that you can share with us?

Best Regards,

Ryuji Asaka

0 Patrick OFarrell over 12 years ago in reply to Ryuji

TI__Mastermind 31600 points

In some applications where I have seen customers use these types of higher current LEDs, they have used a MOSFET or bipolar device to drive the LED. The output of the TLK device would then drive this external device. Perhaps that would be a possibility in this application.

Patrick

0 Ryuji over 12 years ago in reply to Patrick OFarrell

Guru 20090 points

Hello Ptrick san,

Thank you for the reply.

I understood that we need external device for driving 20mA LEDs.

I'm waiting maximum value of the LED current.

Best Regards,

Ryuji Asaka

0 Ryuji over 12 years ago in reply to Ryuji

Guru 20090 points

Hello Patrick san,

Sorry for bothering you.

Our customer change the LED current to 5mA(typ).

So, could you please kindly let me know the maximum value.

Best Regards,

Ryuji Asaka

0 aviad over 12 years ago in reply to Ryuji

TI__Intellectual 2000 points

Hi Ryuji,

5mA is typical value. we will look for the max value, in the meantime you can proceed with these LED's

Thanks,

Aviad

0 Ryuji over 12 years ago in reply to aviad

Guru 20090 points

Hello Aviad,

Are there any update about max value of LED current ?

Best Regards,
Ryuji Asaka

0 aviad over 12 years ago in reply to Ryuji

TI__Intellectual 2000 points

Hi Asaka-san,

max value for LED current is 8mA.

Thanks,

Aviad

0 Ryuji over 12 years ago in reply to aviad

Guru 20090 points

Hello Aviad,

Thank you for the reply.

I understood.

Best Regards,

Ryuji Asaka

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TLK105RHB / LED interface sink, source current and recommended land pattern