OPA462: OPA462 As Buffer-Connections of E/D , E/D_COM and STATUS Flag

Hello Hari,

The OPA462 should work fine as a +36 V input buffer amplifier using the asymmetrical +50/-15 V supplies. Regarding your OPA462 questions:

• I am planning to connect E/D COM to 0 V, then I need to set E/D  between +0.8 V and +5.5 V to enable the output. Can I use a voltage divider for the same?

Yes, a simple voltage divider can be used to set the E/D pin voltage to a level that is within the +0.8 V to +5.5 V. I usually use something convenient, on the order of + 3 V to +3.3 V. Since E/D COM is being set to 0 V, then for + 3V E/D voltage it is just a simple voltage divider connected between +50 V and ground (0 V). A small capacitor can be added to the E/D pin as shown to reduce noise sensitivity, but do note is adds a short delay to the enable time during power up. This isn't usually an issue for most applications. 

• May I know Is it a good method to use a voltage divider in this situation because my supply is 50V.

Here is how the divider is calculated. The OPA462 E/S pin draws very little current so I set RA equal to 100 kilohms.

• Can I use STATUS Flag pin floating?

Yes, it can float.

Regards, Thomas

Precision Amplifiers Applications Engineering

Hello Hari,

Once you have the final OPA462 circuit schematic put together go ahead and post it here. We can check it to make sure you have everything covered.

Regards, Thomas

Precision Amplifiers Applications Engineering