---
# System prepended metadata

title: 'Issue: \<Solved\> Vs of OPA2810 must > 4.75V'
tags: [HW-Circiut, DeWei, issue]

---

# Issue: \<Solved\> Vs of OPA2810 must > 4.75V

## Describe issue

* [OPA2810 datasheet](https://www.ti.com/lit/gpn/opa2810) mentioned:
  * ![](https://i.imgur.com/oUPriFv.png)
* Vs below recommend value: 
  * Performance would be degraded, or others unexpected behavior occured, although the simulation is fine
  * See [here](https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1200285/opa2810-asymmetric-power-supplied-rail-and-little-lower-power-supplied-rail/4526307#4526307)

## Solutions

* **Vs set to 5V (o)**
  * Circiut doesn't modify a lot
  * Buy a 5V version of the previous 4.5V LDO
  * [~1000 NTD for 100 pcs.](https://www.mouser.tw/ProductDetail/Texas-Instruments/TPS7A2050PDBVR?qs=hd1VzrDQEGgpoyZ%2F5FZYnQ%3D%3D)
  * Enough inventary
  * I wish buy it when we contract PCB
  * Can't supplied by usb directly
    * See [here](https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1201125/tps7a20-tps7a20-input-from-usb-vbus-in/4530613#4530613)
    * VS > 5.145V recommend
* Vs+ set to 4.5V, Vs- set to -2.5V
  * For the single-end, still needs 5V LDO
    * With negative bias one done not
* Replace OPA2810 with another OP-AMP which can be supplied by 4.5V

###### tags: `issue` `DeWei` `HW-Circiut`