Page 1
Features
STEVAL-ILL014V1
Evaluation board for the STCS1 constant current
controller for high brightness LEDs
Data Brief
■ Input voltage (V
■ Less than 0.5 V voltage overhead
■ Up to 1.5 A output current
■ PWM dimming pin
■ Shutdown pin
■ LED disconnection diagnostic
): 4.5 V to 40 V
IN
Description
The best way to power LEDs is to control the
forward current in order to achieve good matching
of light output. LED manufacturers specify the
characteristics (such as lumens, beam pattern,
color) of their devices at a specified forward
current.
The STEVAL-ILL014V1 evaluation board
demonstrates the operation of the STCS1
constant current LED driver. The STCS1 is
capable of controlling the LED current under
several application conditions, while also
providing useful features that make it suitable for
different applications such as advertising signs,
automotive interior and exterior lighting, and
emergency vehicle warning lights.
STEVAL-ILL014V1
May 2008 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Page 2
Board schematic STEVAL-ILL014V1
Vcc
PWM
EN
DRAIN
FB
GND
SLOPE
DISC
U1
STCS1A
ope
100nF
ope
1nF
Rsense
0.33, 1%, 0805
J3
Cbypass
0.1uF,50V
BAT46
5V
PWM
GND
J4
J1
100
PWM
5V
Test point
M1
2N7002
J2
GND
5V
R15
10k
EN
5V
GND
IN PWM
Vcc
NTC
10k
R17
1.8k
R1
180
5V
LH R974
5V
J5
VIN
ND
VOUT
U3
L7805
C3
1uF, 50V
This subcircuit is present on EVB
only if the LED is mounted.
C6
0.33uF, 50V
C7
100nF, 6.3V
5V
D3
LUMILEDS LXHL PW09
Vcc
1 Board schematic
Figure 1. Schematic diagram
Vcc
A
K
GND
J1
4
1
2
3
D3
7
SLOPE
PWM
2
5V
6
GND
EN
3
LUMILEDS LXHL PW09
10k
NTC
M1
2N7002
Cslope
2
1 2
J5
Cslope
1
5
FB
STCS1A
DRAIN
4
1
C3
Test point
0
IN PWM
1
2
Rsense
1uF, 50V
5V
R17
1.8k
R15
10k
100nF
1nF
0.33, 1%, 0805
0
123
0
0
only if the LED is mounted.
This subcircuit is present on EVB
0
0
0
Vcc
5V
3 180
0
0.1uF,50V
R1
D1 LH R974
8
U1
1
0
5V
DISC
Vcc
123
C7
3
1
VOUT
VIN
100nF, 6.3V
GND
L7805
C6
Rf 100
2
0.33uF, 50V
Cbypass
5V
U3
PWM
GND
J3
PWM
J2
5V
EN
GND
J4
5V
2/4
D4 BAT46
Vcc
Page 3
STEVAL-ILL014V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
05-May-2008 1 Initial release.
3/4
Page 4
STEVAL-ILL014V1
y
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, an
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2008 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
4/4
Loading...