News

For discussion, let's use the simple example of a single cell Lithium-Ion battery (4.2V to 3.0V) used to power four white LEDs (LED forward voltage, VF, is typically 3.6V to 2.5V, depending on forward ...
Because the bases connect together, voltages at the emitters are nearly the same, and therefore R 2 I R2 equals R 1 I R1. High gain in the transistors means negligible base current, so I R3 is ...
A power-limit circuit can be added to the circuit in Fig. 1 to limit the overall power when there is a large voltage variation for parallel strings of LEDs, with the result shown in Fig. 2.
LYTSwitch-6 isolated LED drivers from Power Integrations deliver flicker-free output up to 65 W and draw as little as 15 mW of standby power. Aimed at smart residential and commercial lighting ...