Hello,
I wish to do a LED driver for 13.5 Volts input.
It should power seven series white LEDs at 300mA.
The TPS 61500 looks like it fits the bill here.
However, there is one problem.
The TPS61500 has an internal switch current detect which doesn't shut the switch off until the switch |(FET) current is 3.5A.
....so this means that on start-up, my inductor will saturate, since it saturates at 2.1A.
I know that the soft start will mitigate this.
...however, when the power is cycled on/off/on, the soft start capacitor will still be charged at the second "on-coming", and the soft start will not happen.
Sp please could you suggest a controller which will deal with this problem and not allow my inductor to saturate at start-up?