IR LED control no resistor PUBLIC

Careful!

LEDs are current and not voltage controlled devices.

You must include a series resistor or some other means to control the LED forward current.

The forward voltage of any semiconductor diode increases roughly as the log of the forward current which means if you drive it from a voltage, the forward current increases roughly exponentially with applied voltage.

Driving it as you've shown, the forawrd current is highly dependent on the voltage of V1 because the M1 and M2 on resistances are small. The LED current will also be highly device to device or at least batch to batch sensitive.

See:

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also