napster4electronics
Newbie level 2
Hey
I use a LTC 4211 to limit the inrush-current of a capacitorbank. The first problem was that we pulled the FAULT and RESET pin to 5V after the FET (so at start the pins aren't pulled up). We solved this issue by connecting those pull-up resistors to VCC.
Hereafter the LTC starts conducting for a few seconds after shutting down and pulling the FAULT pin low. I thought my powersupply was too slowly adapting the current and therefore the LTC went in FAULT mode. ( We are using a 3 mOhm shunt as sensresistor.) We disconnected the powersupply and discharged the capacitorbank. Whereafter we reconnected the powersupply through a multimeter in currentmode (because we thought the powersupply was to slow). And then the LTC went on and stayed on.
This is strange because the series resistor added by connecting the multimeter is very low. So it barely restrict the current and it also isn't added to the shunt (viewed from the LTC point of view). Afterwards I tried the same with a 10 ohm power-resistor and the LTC didn't start conducting.
I use a LTC 4211 to limit the inrush-current of a capacitorbank. The first problem was that we pulled the FAULT and RESET pin to 5V after the FET (so at start the pins aren't pulled up). We solved this issue by connecting those pull-up resistors to VCC.
Hereafter the LTC starts conducting for a few seconds after shutting down and pulling the FAULT pin low. I thought my powersupply was too slowly adapting the current and therefore the LTC went in FAULT mode. ( We are using a 3 mOhm shunt as sensresistor.) We disconnected the powersupply and discharged the capacitorbank. Whereafter we reconnected the powersupply through a multimeter in currentmode (because we thought the powersupply was to slow). And then the LTC went on and stayed on.
This is strange because the series resistor added by connecting the multimeter is very low. So it barely restrict the current and it also isn't added to the shunt (viewed from the LTC point of view). Afterwards I tried the same with a 10 ohm power-resistor and the LTC didn't start conducting.