What is the minimum difference between input voltage and LED (string) voltage for TPS922055 / TPS922054 / TPS922053 / TPS922052 to regulate the output current?
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For TPS922055 / TPS922054 / TPS922053 / TPS922052 to regulate the output current to the target value, you should make sure that LED (string) voltage < input voltage.
For TPS922055 / TPS922054 / TPS922053 / TPS922052 to regulate the output 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.