I have three boards and 3 switches per board. 1 Each for 1.8V, 3.3V, and 5V.
4/9 of the switches wouldn't turn on, out of the box. So I replaced them and got some working. now I'm down to one board that still has two failing. I replaced again and they now barely turn on. If I keep power cycling they eventually turn on sometimes. Sometimes not.
All have 5v VBIAS. CARRIER_PWR_ON is 1.8V but even when I use 3.3V it doesn't change anything.
I have changed C218 (controls rise time) to 1000 pF but that doesn't help.
I can't imagine I'm using it wrong. I ahve accounted for the 330 mA max inrush. I only have 16 uF max output capacitance (on 3.3v) and my rise time is plenty long enough.
Is there something I'm missing?
Are some parts just really fragile and this is a bad design from TI?
Datasheet: https://www.ti.com/lit/ds/symlink/t...tps%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftps22958
Thank you for taking the time to look.
4/9 of the switches wouldn't turn on, out of the box. So I replaced them and got some working. now I'm down to one board that still has two failing. I replaced again and they now barely turn on. If I keep power cycling they eventually turn on sometimes. Sometimes not.
All have 5v VBIAS. CARRIER_PWR_ON is 1.8V but even when I use 3.3V it doesn't change anything.
I have changed C218 (controls rise time) to 1000 pF but that doesn't help.
I can't imagine I'm using it wrong. I ahve accounted for the 330 mA max inrush. I only have 16 uF max output capacitance (on 3.3v) and my rise time is plenty long enough.
Is there something I'm missing?
Are some parts just really fragile and this is a bad design from TI?
Datasheet: https://www.ti.com/lit/ds/symlink/t...tps%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftps22958
Thank you for taking the time to look.