# Regular Meeting (2023.2.6)
* Fanout-48
* Modify design: LDO

## Modify design: LDO
* Before
* 
* After
* 
* Reason
* Layout is too awful because of *Voltage setup resistor*
* Condider 16 -> 48 channels
* 2 sets of LDOs -> 6 sets of LDOs
* Known issue
* **Please set input swimming < 3.3 Vpp**
* Because new LDO IoutMax = 300mA
* Old: 500mA
* Change Vs from 4.5V -> 3.3V for limit swimming of input signal??
* Higher Vs would get better performance for most of OPAs
* Especially for Slew Rate
* 
* 
* 5Vusb -> 3.3V of LDO
* (5-3.3)\*Iout = **Power dissipation on LDO**
* Heat
* 
* 5V LDO -> 3.3V LDO -> OPA ??
* Additional LDO and additional capacitor
* Because I think this board is just what we'll use.
* Don't need these protect/prevent

###### tags: `Regular Meeting` `DeWei`