Output voltage : ADA4870

Hello,

The output voltage range as per data sheet under +/-20V supply are as follows.

Where as, if you will use single ended supply of +Vs = 40V and -Vs = GND,

you can expect an output range of 2V to 38V.

For your 2nd query, we will get back to you if we have the circuit/test condition used to achieve that performance.

Regards.

Hi 

Thank you for your answer.

Do you have any further answers?
If ADA4870 does not have a circuit diagram, please tell me how to use a larger voltage on other common OPAMP.

Hello,

I can sense that you are aiming for high output voltage.

Can you tell us more about your system requirements/considerations?

In this case we can help you to find suitable product.

Regards.

Hi Fdelaram

The specifications I want are 0 to 50 V outputs.
However, the ADA4870 power supply is 0-42V.

The TEST result shows that the component surface temperature is 100°C or higher when using 0 to 50V.
Please check if you can use 0 to 50V safely or if you are satisfied with any product.

Thanks,

Damon

Hi Fdelaram

The specifications I want are 0 to 50 V outputs.
However, the ADA4870 power supply is 0-42V.

The TEST result shows that the component surface temperature is 100°C or higher when using 0 to 50V.
Please check if you can use 0 to 50V safely or if you are satisfied with any product.

Thanks,

Damon

Hello,

We have some other products that can have higher output voltage.

The primary advantage of ADA4870 is higher Bandwidth, fast Slew Rate, and high current drive.

If your requirement doesn't need such advantage, please try to consider other high voltage product available in this link.

Hope this helps.

Regards.

Hi 

OK, The ADA4870 does not have a spec.
If you find the document "Up to 60 Vpp 1A with external BJT," please share it.

Thanks,

Damon

Hi Fdelaram

Long time no see~

The circuit was designed using the above document (dynamic class A).
However, heat was generated and the FET was broken.
Can you tell me what the problem is?

There is one more question.
How do I design Dynamic Class AB?
Please share the schematic diagram of Dynamic Class AB.

thanks,

Damon

Hello,

Apology if I didn't get back fast.

We cannot find the circuit that suggests using BJT to achieve that waveform snapshot but we have a characterization board w/c uses FET for bootstrapping.

Here is the schematic:

Please note, adequate thermal management may be required for higher power dissipation.

Also,optimal performance (voltage swing, slew rate, settling time and power supply requirements) depends on proper choice of bootstrapping MOSFET devices and associated discrete components.

Regards.

Hi Fdelaram

Long time no see.

My client started the project again.
The circuit was constructed as shown in the attached document.
However, the output value could not be exported to +-25V .
Can you tell me what the problem is?

PDF

I am going to use the circuit below because it doesn't work.
Can you tell me the value of the resistance capacitor?
It's best to deliver the correct circuit.

Thanks

Damon