AN2531
STEVAL-ILL009V1 reference board
17/40
8 STEVAL-ILL009V1
reference
board
STEVAL-ILL009V1 reference board shown in
was designed to demonstrate how
high power and high brightness RGB LEDs can be driven and to confirm the principles
described in the paragraphs above.
This board has the following main features:
●
Different LEDs as a load can be used (additional boards connected through 30 pin
connector)
●
8 LEDs with 350 mA can be driven (e.g. Golden DRAGON module - STEVAL-
ILL009V4)
●
4 LEDs with 700 mA can be driven (e.g. OSTAR module - STEVAL-ILL009V3)
●
LED over temperature protection using STLM20 or NTC resistor
●
LED temperature limit set by software
●
3 A at 4 V DC/DC converter using L4973D3.3 for user friendly input (8 - 30 V)
●
Color regulation (manual / auto)
●
Brightness PWM regulation with 64 levels using OE pin (dimming all LEDs)
●
Red, Green, Blue individual tuning
●
White color preset mode
●
LED frequency = 100 Hz
●
64 levels of brightness for each LED with software color control
●
262144 color variations (64 x 64 x 64)
●
SW startup implemented (200 ms)
●
Over voltage protection implemented using clamp Schottky diodes (BAT46)
●
6 different light MODES available
●
Input over voltage protection done by Transil (SMAJ33A)
●
Over temperature signalization
●
I
CC
connector for SW evaluation and change.
8.1 General
description
shows components position on the STEVAL-ILL009V1. On the left side there is
DC/DC converter with L4973D3.3 (ref. to
, point
) with power capability 3 A
at 4 V. The input voltage range is from 8 to 30 V and it is connected through input connector.
The L78L05 (ref. to
, point
) provides 5 V supply voltage for the microcontroller
and LED drivers (signal diode D8 is used to show connected power). Potentiometers P1 and
P2 are used to set brightness for all LEDs or tuning each of them separately. High power
RGB LEDs are driven by STP04CM596 and STP08CL596 is used to control signal LEDs
(D1-D7) which are implemented to show which of the several lighting modes is currently set.
30 pins load connector provides better flexibility, because different types of LEDs can be
connected to the same board. As an example two load boards with LEDs were designed -
STEVAL-ILL009V3 and STEVAL-ILL009V4.
