TPS65400: Power sequencing without I2C

karteek kosana

Part Number: TPS65400

Hello,

I Would like to use TPS65400 for FPGA power with out I2C Configuration and I have below queries.

1.As the FPGA's powers are needed to be sequenced what I am doing is enabling them by giving previous channels output through resistor divider configuration but one of my first out put was 1V which was not sufficient for enable.Is it okay to connect the EN1 to Vin through resistor divider and then I will use VDD for the next channel and then the corresponding outputs to get the Sequencing.

2.As I am not using I2C do I supposed to connect the SS pins to ground through capacitors or do I still need the Pullups.

over 3 years ago

0 Shuai Fan over 3 years ago

TI__Genius 13451 points

1. It's a normal way to connect to VIN through divider, but be careful about the divider ratio to make sure it doesn't exceed the ABS value. You can provide the input voltage range, we can help to review.

2. It suggest to add capacitor to achieve soft start functions, this can reduce the over shoot and the transient current supplied by previous power rail. Iss=5uA.