Sourcing Power Components

The LED lamp’s electronics can be divided into three sections:

• Control System
  • To accept user input, manipulate input data, send commands to LED drivers.
• LED Driver System
  • To drive the LED at a constant current.
• Power System
  • To provide adequate and stable power to the Control and LED Driver Systems.

ON Semiconductor was chosen to provide most of power circuitry, mainly because they were the only ones to offer a 1.5A LED driver in PDIP form. PDIP can be easily hand soldered, as they are through hole components.

PDIP

SOIC are much harder and TSOP nearly impossible to hand solder. The latter two are known as surface mount technology devices. These types of components are used in large volume production runs in consumer electronics.

SOIC

TSOP

The following parts have been sourced from ON Semiconductor through their samples program. Unfortunately their sample program requires a $11 shipping and handling charge. While it isn’t much, one better load up on samples to make the charge worthwhile. There is a maximum of 25 samples per component. It seems that DigiKey is the fulfillment operator, and the samples were shipped FedEx Overnight.

LED driver 1.5A NCP3065PG
Voltage regulator 5v 1A MC7805ABTG
Voltage regulator 3.3v 800mA MC33269T-3.3G
Voltage regulator 1.2-37v 1.5A LM317BTG
Bipolar junction transistor 2N3904G