TPS40090-Q1: TPS40090-Q1

Hi Sam,

Below is the reply to your questions.

1. Short circuit protection;

This part has OC and short circuit protection.

2.  Slope compensation;

This part has internal slope compensation. For most appliation, external slope compensation is not needed.

3.  I use external housekeeping 12V to power the IC. Can it be Used in High Voltage application (Vin = 100V;  Vout = 24V;  Pout = 3.5KW)? Shall I increase BP5 voltage?

Yes, you can use 12V to power the IC for high Vin application.

4.  Can I used BP5 for external 5V power supply to drive logic and amplifier chips?  What is the largest external driving current?

No, this is not recommended. BP5 is for internal circuit use only.

5. I do not want Droop. How to connect?

If DROOP function is not needed, connect DROOP pin to REF pin directly.

6. I want to confirm there is no problem when Vout=24V, there is no DCR current sense common mode voltage issues.

One problem is the current sense circuit. Vout is 24V in your application, but the input common mode voltage (CS and CSCN voltage with respect to GND) of current sense amplifier is only up to 4V.

Resistor divider has to been used to reduce the input common mode voltage. We can discuss more if you are still interested in this part.

Thanks

Qian