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P3D Re: White LED efficiency.

  • From: Greg Erker <erker@xxxxxxxxxxxxxx>
  • Subject: P3D Re: White LED efficiency.
  • Date: Tue, 7 Dec 1999 07:40:00 -0700
>For example, he says that using a series resistor to limit current to a
>LED wastes power. He does not say that using a voltage regulator or
>current regulator wastes more power. Tsk, tsk, tsk.

  He is using a switching (stepup) regulator
as far as I can tell. See:
http://www.hdssystems.com/Subassemblies.htm#PowerSupply24LED

---quote---
This power supply takes input voltages from
1.5V to 3.0V and provides an output voltage
of 3.2V or 2.95V to drive a white LED array.
---end---

  No way that a series regulator can do that.

Greg E.