AN2259 Datasheet, PDF (21/38 Pages) STMicroelectronics – High intensity LED driver using

AN2259
6 REFERENCE DESIGN VERSIONS
Table 4. 12Vac Input 3W LED Driver Bill of Materials
Part
Qty Reference
Mfg P/N
Mfg
Geometry Mtg
Description
1
C1
1200uF/35V
Electrolytic
EEU-
FC1V122L
Panasonic
Radial
TH
1
C2
220pF/50V
Ceramic
SMD
2
C3, C4
22nF/50V
Ceramic
SMD
1
C5
4.7nF/50V
Ceramic
SMD
5
D2, D4, D5,
D6, D7
Schottky Diode
2A/40V
STPS2L40U
STMicroelectronics
SMB
SMD
1
L1
33uH Inductor DO3308P-333
Coilcraft
9.4mmx12.95mm SMD
1
Q1
PNP Transistor MMBT3906 STMicroelectronics
SOT-23
SMD
1
Rs
0.33 Ohm 1%
CRL2010-FW-
R330E
Bourns
2010
SMD
1
R1
2.74k 1%
0805
SMD
1
R2
1.33k 1%
0805
SMD
1
R3
4.7k 5%
0805
SMD
1
R4
240k 5%
0805
SMD
1
U1
Step-down
controller
L5973D STMicroelectronics
SO8
SMD
21/38