1

schematic

simulate this circuit – Schematic created using CircuitLab

Let's say I have a select line that is connected to 8 data lines in an LED matrix. The current at the drain of the MOSFET is 800mA. Will the current divide among the 8 LEDs into 100mA for each data line? And if so, does that mean the current in the wire between the first and second diodes on the select line is 700mA, the second and third diodes 600mA, and so on?

NaP
  • 25
  • 4
  • 1
    LEDs have a really non-linear and non-uniform curent draw versus voltage. So one will probably get most of the current. You need to add resistors on each LED to limit the current to a safe level for the LED. How much current can each handle before they start burning out? – zeta-band Apr 08 '19 at 23:59
  • Another minus point is the negative temperature coefficient of the LED's forward voltage. – Long Pham Apr 09 '19 at 04:26

1 Answers1

0

Yes, current will divide equally according to KCL assuming that each diode is ideally same. Remember that leds unprotected by resistors will try to consume as much power as it's available, potentially causing its damage. Try out Paul Falstad's circuit simulator, it's incredibly useful tool.

Damian K.
  • 116