TPS922055: Maximum output duty cycle (minimum difference between Vin and Vout)

Hi Andras,

Andras Gajdacs said:

I could not find anywhere in the datasheet the maximum output duty cycle or the minimum difference between Vin and Vout.

I assume, let's say, if the input voltage is 24 V then the maximum output voltage has to be lower than 24 V.

For TPS922055 to regulate current to the target value, you should make sure that LED (string) voltage < input voltage.

For TPS922055 to regulate current to the target value most accurately and consistently, you should make sure the voltage of the CSP pin > 2V. That is to say, you should make sure that input voltage - LED (string) voltage > 2V.

Andras Gajdacs said:

Also, how is the output voltage determined during CV mode?

When full CV mode is entered, the output voltage is clamped so that the voltage of the UVP pin is clamped at 1.32V (TYP).

Best Regards,

Steven