Hello,
I have an old VGA card that I'm not using it anymore and the VGA use RT9259 Buck IC, and I want to re-use it for making buck converter. I already read the manual, but I still confused. My question is,
1. The boost voltage is only max to 15v or 24v?
2. How to calculate the LDO Vout? Is it 0.8(1+R1/R2)? Do I have to use mosfet or I can use NPN such as 2N2222?
Thanks
![](https://www.electro-tech-online.com/data/attachments/89/89101-fa77e1e5eff547b7b165d189883041c5.jpg)
![](https://www.electro-tech-online.com/data/attachments/89/89102-7467ef95d134a7781625339073781cb4.jpg)
I have an old VGA card that I'm not using it anymore and the VGA use RT9259 Buck IC, and I want to re-use it for making buck converter. I already read the manual, but I still confused. My question is,
1. The boost voltage is only max to 15v or 24v?
2. How to calculate the LDO Vout? Is it 0.8(1+R1/R2)? Do I have to use mosfet or I can use NPN such as 2N2222?
Thanks
![](https://www.electro-tech-online.com/data/attachments/89/89101-fa77e1e5eff547b7b165d189883041c5.jpg)
![](https://www.electro-tech-online.com/data/attachments/89/89102-7467ef95d134a7781625339073781cb4.jpg)