ADPD103 Drives a LED ( 5V~7V@20mA )

Hello,

The maximum voltage that can be applied at the LEDX pin is 3.6V. If the voltage of the pin is pulled above that voltage it could result in damage to the device. There are two things to watch for, the first is what the forward bias voltage of the LED will be when the driver is at 20mA. The cathode of the LED will need to be <3.6V when the LED is on. The second thing is what will the drop across the LED be when the LED driver is OFF. There will be some leakage through the LED driver and the ESD diodes that will cause some voltage drop across the LED, but lower than the turn-on voltage of the LED. Typically, this will be on the order of nanoamps. With green LEDs operating on a 5V VLED, for example, the voltage drop of the LED is large enough due to this leakage current that the 3.6V maximum voltage of the driver pin is not violated. You would need to experiment with your particular LED to see if this is the case.

Regards,

Kevin

Hello,

The maximum voltage that can be applied at the LEDX pin is 3.6V. If the voltage of the pin is pulled above that voltage it could result in damage to the device. There are two things to watch for, the first is what the forward bias voltage of the LED will be when the driver is at 20mA. The cathode of the LED will need to be <3.6V when the LED is on. The second thing is what will the drop across the LED be when the LED driver is OFF. There will be some leakage through the LED driver and the ESD diodes that will cause some voltage drop across the LED, but lower than the turn-on voltage of the LED. Typically, this will be on the order of nanoamps. With green LEDs operating on a 5V VLED, for example, the voltage drop of the LED is large enough due to this leakage current that the 3.6V maximum voltage of the driver pin is not violated. You would need to experiment with your particular LED to see if this is the case.

Regards,

Kevin