Soft-start of TPS62400

Hi Masami,

the parameter Tstart_up and Tramp depend on several parameters of the TPS62400.
What is the customer requirement in terms of minimum and maximum total start up time of TPS62400?
What is supplying TPS62400?

Best regards

Lubomir Fenic

Hi, Lubomir-san,

The customer uses it on the following conditions.
As for the input power supply, 5V is unitary.
I sound a warning buzzer by the output.
ON time is 22mS in the period of the buzzer, and OFF time is 3mS.
The output capacitor is 10uF.
The load currents current is from 170mA to 370mA.

Thanks, Masami M.

Hi Masami-san,

will be power supply for warning buzzer (during OFF time 3ms) enabled or disabled?

I would like to undestand answer to questions mentioned above:
What is the customer requirement in terms of minimum and maximum total start up time of TPS62400?

Best regards

Lubomir Fenic

Hi, Lubomir-san,

1ch of TPS62400 is the power supply for the buzzer warning.
The customer want to ensure the ON time and OFF time of the power supply for the buzzer warning.
Its accuracy is ± 0.5mS.
In addition, they hope that the rise time of Vout is less than or equal to 0.1mS.

Thanks, Masami M.

Hi Masami-san,

does it means that start up time requirement is 3ms± 0.5ms?

Best regards

Lubomir Fenic

Hi, Lubomir-san,

No.
± 0.5mS, then they need to start up in that is Max 1mS.

Thanks, Masami M.

Hi, Lubomir-san,

-Input voltage is 5V.
-Output voltage
ch1 4V
ch2 3.3V
-Output current
ch1 410mA Max, Typ 240mA
ch2 240mA Max, typ 110mA
-maximum start up time <1ms
They want to Max start up time is about 1.2mS

Thanks, Masami M.

The TPS62237 can be used for the 3.3V rail and the TPS62080 for the 4V rail. These devices have much faster SS times, which are well below 1.2 msec.

Otherwise, there is the TPS62097 with its SS pin that allows you to set the SS time to any value.

Hi, Chris-san,

Thank you for your reply.
I will tell it to the customer.

Thanks, Masami M.