LM3444MASLASHNOPB.B datasheet(23/38 Pages) TI2

23 / 38 page

LINE VOLTAGE (VAC)

95.0

90.0

85.0

80.0

75.0

100

110

120

130

140

14 Series connected LEDs

10 Series connected LEDs

i = C

25.2V

115

(350 kHz x 0.1A)

L2 =

= 580 PH

25.2V 1

0.8

LM3444

www.ti.com

SNVS682D – NOVEMBER 2010 – REVISED DECEMBER 2015

Typical Application (continued)

(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.

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

Figure 20. Efficiency vs Input Voltage

Table 1. Bill of Materials

MANUFACTURER PART

QTY

DESIGNATOR

DESCRIPTION

MANUFACTURER

NUMBER

IC, CTRLR, DRVR-LED, VSSOP

LM3444MM

BR1

Bridge Rectifiier, SMT, 400 V, 800 mA

DiodesInc

HD04-T

Common mode filter DIP4NS, 900 mA, 700 µH

Panasonic

ELF-11090E

Inductor, SHLD, SMT, 1 A, 470 µH

Coilcraft

MSS1260-474-KLB

L3, L4

Diff mode inductor, 500 mA 1 mH

Coilcraft

MSS1260-105KL-KLB

Bead Inductor, 160

Ω, 6 A

Steward

HI1206T161R-10

C1, C2, C15

Cap, Film, X2Y2, 12.5 MM, 250 VAC, 20%, 10 nF

Panasonic

ECQ-U2A103ML

Cap, X7R, 0603, 16 V, 10%, 100 nF

Murata

GRM188R71C104KA01D

C5, C6

Cap, X5R, 1210, 25 V, 10%, 22 µF

Murata

GRM32ER61E226KE15L

C7, C9

Cap, AL, 200 V, 105C, 20%, 33 µF

UCC

EKXG201ELL330MK20S

C10

Cap, Film, 250 V, 5%, 10 nF

Epcos

B32521C3103J

C12

Cap, X7R, 1206, 50 V, 10%, 1 µF

Kemet

C1206F105K5RACTU

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