LM4675 Peak Current & Common Mode Input Voltage Range

Hi,

We have not received a reply from you yet.
Our customers are in trouble.
Please tell us them as soon as possible.

Best Regards,
Kato

Hi,

We have not received a reply from you yet.

Q1. Peak Current
The TPA2011D1 has the function of overcurrent protection, does the LM4675 have same function?
If the LM4675 has this function, please tell us overcurrent protection threshold.

Q2. Common Mode Input Voltage Range
There is description of common mode input voltage range in data sheet of the TPA2011D1.
Does the LM4675 require input coupling capacitors?
Please tell us about them as soon as possible.

Best Regards,
Kato

Hi,

Our customers are in trouble.
We have not received a reply from you yet.
Please advise us about Q1 and Q2.

Best Regards,
Kato

Hi, Kato-san,

Sorry for the delay in getting back to you. I was on vacation, and the team missed your posts.

Q1. Yes, LM4675 has short-circuit protection, this is mentioned on the first page of the data sheet. The last sentence of the description text. We don't specify the threshold at which this trips, but it will be above the maximum output power rating of the amplifier.

Q2.We don't have CMRR data, either, but the device IS capable of being driven without the input coupling caps if a fully-differential input is used. Figures 2, 25, and 27 of the d/s show this, and it is discussed further on page 10 of the d/s in the section titled, "DIFFERENTIAL AMPLIFIER EXPLANATION" which says: "The LM4675 also offers the possibility of

DC input coupling which eliminates the two external AC coupling, DC blocking capacitors."

-d2

Hi, Don-san,

Thank you for information.
We understood about Q1.
Because the LM4675 offers the possibility of DC input coupling, we have an additional question about Q2.
Even if the power supply voltage is 5V, the gain setting is 1V/V, input signal amplitude is 9.6Vpp-diff(between GND+100mV and VCC-100mV),
is the LM4675 possible to keep low distortion?
We would like to know that whether this product supports rail to rail input and output operation.
Please tell us about them as soon as possible.

Best Regards,
Kato

Hi, Kato-san,

No, you won't be able to get that close to the rails. You can calculate the output swing for various loads by looking at the figures in the d/s, for example, Figures 5 and 6 for 4- and 8-ohm loads.

You can't drive high current and get close to the rails. You are limited by IDD*rDS(on) of the mosfets in the output stage.

-d2

Hi, Don-san,

Thank you for your information.
We understood that this product don't supports rail to rail input and output operation.
We were not able to find Rds(on) of this device in the data sheet.
Please tell us high side Rds(on) and low side Rds(on).

Best Regards,
Kato

Hi, Don-san,

Thank you for your cooperation.
We understood it.
Thank you so much.

Best Regards,
Kato