LT3496 datasheet(11/20 Pages) LINER

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LT3496

3496ff

Table 1. Ceramic Capacitor Manufacturers

VENDOR

TYPE

SERIES

Taiyo Yuden

Ceramic

X5R, X7R

AVX

Ceramic

X5R, X7R

Murata

Ceramic

X5R, X7R

Kemet

Ceramic

X5R, X7R

Inductor Selection

Several inductors that work well with the LT3496 are listed

in Table 2. However, there are many other manufacturers

and devices that can be used. Consult each manufacturer

for more detailed information and their entire range of

parts. Ferrite core inductors should be used to obtain the

best efficiency. Choose an inductor that can handle the

necessarypeakcurrentwithoutsaturating,andensurethat

the inductor has a low DCR (copper-wire resistance) to

minimize I2R power losses. An inductor with a magnetic

shield should be used to prevent noise radiation and cross

coupling among the three channels.

Diode Selection

The Schottky diode conducts current during the interval

when the switch is turned off. Select a diode VR rated

for the maximum SW voltage. It is not necessary that

the forward current rating of the diode equal the switch

current limit. The average current, IF, through the diode

is a function of the switch duty cycle. Select a diode with

forward current rating of:

IF = IL • (1 – D)

where IL is the inductor current.

If using the PWM feature for dimming, it is important to

consider diode leakage, which increases with the tem-

perature from the output during the PWM low interval.

Therefore, choose the Schottky diode with sufficient low

leakage current. Table 3 shows several Schottky diodes

that work well with the LT3496.

Table 3. Schottky Diodes

PART NUMBER

VR (V)

IF (A)

PACKAGE

ZETEX

ZLLS350

0.38

SOD523

ZLLS400

0.52

SOD323

applications inForMation

Table 2. Surface Mount Inductors

PART NUMBER

VALUE

(µH)

DCR

(

Ω MAX) IRMS (A)

SIZE

× L × H (mm3)

Sumida

CMD4D06

2.2

0.116

0.95

3.5

× 4.3 × 0.8

3.3

0.174

0.77

CDRH3D16

2.2

0.072

1.20

3.8

× 3.8 × 1.8

3.3

0.085

1.10

4.7

0.105

0.90

CDRH4D28

0.128

1.00

5.0

× 5.0 × 3.0

0.149

0.76

CDRH5D28

0.122

0.9

6.0

× 6.0 × 3.0

0.189

0.75

CooperET

SD3112

2.2

0.140

0.97

3.1

× 3.1 × 1.2

3.3

0.165

0.90

4.7

0.246

0.74

SD14

0.2058

1.1

5.0

× 5.0 × 1.4

SD20

0.1655

1.25

5.0

× 5.0 × 2.0

0.2053

1.12

SD25

0.2149

1.11

5.0

× 5.0 × 2.5

Taiyo Yuden

NR3015

2.2

0.06

1.48

3.0

× 3.0 × 1.5

4.7

0.12

1.02

NP04SZB

4.7

0.075

1.6

4.0

× 4.0 × 1.8

0.100

1.2

0.180

0.95

0.210

0.77

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