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| LM3444_15 Datasheet, PDF (23/27 Pages) Texas Instruments – AC-DC Offline LED Driver | |||
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www.ti.com
LM3444
SNVS682D â NOVEMBER 2010 â REVISED DECEMBER 2015
Typical Application (continued)
25.2V 1
1 u 25.2V
0.8 115 2
L2 =
= 580 PH
(350 kHz x 0.1A)
(41)
12. Choose C10: 1 µF, 200 V
13. Calculate valley-fill capacitor values:
VAC low line = 90 VAC, VBUCK minimum equals 60 V. Set droop for 20-V maximum at full load and low line as
shown in Equation 42.
dv
i = C dt
where
⢠i equals POUT/VBUCK (270 mA)
⢠dV equals 20 V
⢠dt equals 2.77 ms
⢠CTOTAL equals 37 µF
(42)
Therefore, C7 = C9 = 22 µF
8.2.3 Application Curve
95.0
14 Series connected LEDs
90.0
85.0
10 Series connected LEDs
80.0
75.0
80
90 100 110 120 130 140
LINE VOLTAGE (VAC)
Figure 20. Efficiency vs Input Voltage
QTY
1
1
1
1
2
1
3
1
2
2
1
1
DESIGNATOR
U1
BR1
L1
L2
L3, L4
L5
C1, C2, C15
C4
C5, C6
C7, C9
C10
C12
Table 1. Bill of Materials
DESCRIPTION
IC, CTRLR, DRVR-LED, VSSOP
Bridge Rectifiier, SMT, 400 V, 800 mA
Common mode filter DIP4NS, 900 mA, 700 µH
Inductor, SHLD, SMT, 1 A, 470 µH
Diff mode inductor, 500 mA 1 mH
Bead Inductor, 160 â¦, 6 A
Cap, Film, X2Y2, 12.5 MM, 250 VAC, 20%, 10 nF
Cap, X7R, 0603, 16 V, 10%, 100 nF
Cap, X5R, 1210, 25 V, 10%, 22 µF
Cap, AL, 200 V, 105C, 20%, 33 µF
Cap, Film, 250 V, 5%, 10 nF
Cap, X7R, 1206, 50 V, 10%, 1 µF
MANUFACTURER
TI
DiodesInc
Panasonic
Coilcraft
Coilcraft
Steward
Panasonic
Murata
Murata
UCC
Epcos
Kemet
MANUFACTURER PART
NUMBER
LM3444MM
HD04-T
ELF-11090E
MSS1260-474-KLB
MSS1260-105KL-KLB
HI1206T161R-10
ECQ-U2A103ML
GRM188R71C104KA01D
GRM32ER61E226KE15L
EKXG201ELL330MK20S
B32521C3103J
C1206F105K5RACTU
Copyright © 2010â2015, Texas Instruments Incorporated
Product Folder Links: LM3444
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