LM4819: About turn on time

Ozawa

Part Number: LM4819

The relationship between the capacitor capacity connected to the Bypass terminal of the amplifier and the turn-on time is described on page 12 of the specification sheet. (Http://www.ti.com/lit/ds/symlink/lm4819.pdf)

Please teach me this quesution.

◆Question
What is the error of the turn-on time due to the individual difference of the amplifier?
Capacitor capacity is assumed to be 0.1 ~ 0.22 uF.

over 6 years ago

0 José Luis over 6 years ago

TI__Mastermind 20085 points

Hello Ozawa,

I don't understand your question very well, could you provide me more details?

Best Regards
José Luis Figueroa
Applications Engineer

0 NAOKI AOYAMA over 6 years ago in reply to José Luis

Guru 11215 points

Hello Jose,

Allow me to cut in.
It is mentioned "An internal current source charges the voltage of the bypass capacitor" at P12 on the datasheet.
Could you tell me how about the variation of the value of the internal current source due to the process variation?

The customer will check the variation of the Turn-on time.

Best Regards,
Naoki Aoyama

0 José Luis over 6 years ago in reply to NAOKI AOYAMA

TI__Mastermind 20085 points

Hi Aoyama-san

Unfortunately, I could not find this data and it is quite difficult to find this kind of information due to this is an old device.
I think the important point in this section is the turn-on time and you can find it on the table.

Best Regards
José Luis Figueroa
Applications Engineer

0 NAOKI AOYAMA over 6 years ago in reply to José Luis

Guru 11215 points

Hi Jose,

Thank you for your reply.
I see.
The customer will input audio signal to the LM4819 after it turn-on.
They design this timing critical.

Is there the circuit diagram of the LM4819?
Is the 1/2xVDD made by resistive divider?

Best Regards,
Naoki Aoyama

0 José Luis over 6 years ago in reply to NAOKI AOYAMA

TI__Mastermind 20085 points

Hi Aoyama-san,

Unfortunately, it is quite difficult to locate the design files of this kind of devices because they are very old devices.

Best Regards
José Luis Figueroa
Applications Engineer

0 NAOKI AOYAMA over 6 years ago in reply to José Luis

Guru 11215 points

Hi Jose,

Thank you for your reply.
I see there is no data about Boomer series.

Thanks,
Naoki Aoyama

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LM4819: About turn on time