Sourcing Components: Delays!

I received the package of samples from ON Semiconductor. FedEx Overnight! Much to my dismay they shipped everything BUT the LED drivers. Oh no! Those were the only reason why I sourced samples from ON. Whatever they are creating, I hope it’s quick.

Then I found out from DigiKey that the microcontroller is backordered until February 15th. So much for spending this week getting familiar with it.

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

Color Temperature

So…I mechanically attached the Lamina Atlases to the heatsink and made a makeshift “lamp”. I could see the difference in colors between the daylight (cool) and warm LEDs as well as both of them together. Then I tested them against a 15w halogen – the camera does exaggerate the halogen test shot though.

Also, the heatsink gets hella hot and is definitely insufficient.

Cool, Warm, Both, Both Wide, and Halogen:

I definitely like the Warm White better and wouldn’t mind getting 3 (or 1 cool – 2 warm), but heat will probably be a big issue…

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Update: More Pictures!

SMD Fiasco/SideProj

Ok, so the SMD LEDs I got were totally useless. So I sorta converted it to a light table – but even 6 sets of 3 SMD LEDs are not enough (as you can see). Might make for a nice ambient light esp if I can control each cluster to pulsate for some cool patterns…like a light show!

So we’re definitely going with the Lumina Atlas, but we/I need to figure out how many to install per lamp (2 or 3).