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High intensity LED driver for MR-16 format based on L5973D
Data Brief
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Last Updated: 19/11/2007
Pages: 4
Untitled Document
Generic Part Number
Orderable Part Number
Status
L5973D
L5973D013TR
Active
L5973D
Active
STEVAL-ILL007V1
STEVAL-ILL007V1
Active
Related Application Notes
APPLICATION IDEAS: DRIVING LEDs USING L497x, L597x, L692x DC-DC CONVERTERS FAMILIES
Designing with the 2.5 A DC-DC converter L5973D
High intensity LED driver using the L5970D/L5973D
Related Datasheets
2.5 A switch step down switching regulator
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STEVAL-ILL007V1
High intensity LED driver for MR-16 format based on L5973D
Data Brief
Features
This evaluation board was designed so that it can be configured to accept several different input voltages The most common input voltages are 12 Vac, 12 Vdc (for automotive) and 24 Vdc The board also allows the user to select the output current by using jumpers setting only The standard configuration of the board includes a full wave bridge rectifier that is required for an AC input
STEVAL-ILL007V1
Description
This reference design is a constant current driver for high brightness LEDs. The supply input voltage can be either 12 V AC or DC, and for DC it can range from 6 V to 24 V. It can also be adapted for reverse battery protection in automotive applications. The output is a constant current that can drive a single or multiple LEDs in series at 350 mA, 700 mA or 1.05 A.
November 2007
Rev 1
1/4
www.st.com 4
For further information contact your local STMicroelectronics sales office.
1
2
2
STPS2L40U 2 SY N C 1/ 8W INH GN D FB 1 5 C OMP D2 STPS2L40U 4
D6 STPS2L40U + VR EF 2 6 1
1
J1
1
3
2
2
Phoenix 2 pin 2 R3 4. 7k 1 1/ 8W 2 D5 STPS2L40U
C2 220pf
C3 22nF 7
1
1
E
1
Q1 MMBT3906 C C5 4. 7nf
B
Rs 0. 68 Ohm 1/ 4W 1 1
Rs 2 0. 68 Ohm 1/ 4W
2
1/ 8W
2
2
1
2/4
Board schematic
Figure 1.
Schematic
U1 L1 DO3316p-683 Vc c 8 VC C R1 2. 74K 2 68uH OU T 1 C1 1200uF 35V
L5973D J3 6 5 4 3 2 1 TY C O
Board schematic
D4
2 1
D7
R2 2 1. 33K 1/ 8W C4 22nf 1 J2 2 1 C ON N PCB 2 R4 240k 2 1
J4
STPS2L40U
C ON N PCB 2
Rs 3 0. 68 Ohm 1/ 4W
STEVAL-ILL007V1
STEVAL-ILL007V1
Revision history
2
Revision history
Table 1.
Date 13-Nov-2007
Document revision history
Revision 1 Initial release Changes
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STEVAL-ILL007V1
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Document Number: 14175
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