LT3596IUHG データシートの表示（PDF） - Linear Technology

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LT3596IUHG

60V Step-Down LED Driver

Linear Technology 

LT3596

Applications Information

Inductor Selection

Inductor values between 100µH and 470µH are recom-

mended for most applications. It is important to choose

an inductor that can handle the peak current without

saturating. The inductor DCR (copper wire resistance)

must also be low in order to minimize I2R power losses.

Table 1 lists several recommended inductors.

Table 1. Recommended Inductors

PART

MAX CURRENT

L DCR RATING

(µH) (Ω)

(A) VENDOR

MSS1038

MSS1038

MSS1246T

100 0.3

220 0.76

470 0.935

1.46 Coilcraft

0.99 www.coilcraft.com

1.0

CDRH10D68

CDRH12D58R

100 0.205

220 0.362

470 0.67

1.5 Sumida

1.0 www.sumida.com

1.01

DS1262C2

100 0.17

220 0.35

1.5 Toko

1.0 www.toko.com

VLF10040

100 0.22

220 0.47

1.3 TDK

0.9 www.tdk.com

DR124

DR127

DR74

100 0.26

220 0.56

470 0.861

100 0.383

1.79 Coiltronics

1.15 www.cooperet.com

1.6

0.99

744771220

220 0.40

1.2 Würth Elektronik

www.we-online.com

Capacitor Selection

Low ESR (equivalent series resistance) capacitors should

be used at the outputs to minimize output ripple voltage.

Use only X5R or X7R dielectrics, as these materials retain

their capacitance over wider voltage and temperature

ranges than other dielectrics. Table 2 lists some suggested

manufacturers. Consult the manufacturers for detailed

information on their entire selection of ceramic surface

mount parts.

Table 2. Recommended Ceramic Capacitor Manufacturers

Taiyo Yuden

www.t-yuden.com

AVX

www.avxcorp.com

Murata

www.murata.com

Kemet

www.kemet.com

TDK

www.tdk.com

Typically 10µF capacitors are sufficient for the VIN and BIAS

pins. The output capacitor for the buck regulator depends

on the number of LEDs and switching frequency. Refer to

Table 3 for the proper output capacitor selection.

Table 3. Recommended Output Capacitor Values

(Volts/LED = 3.5V)

SWITCHING

FREQUENCY (kHz)

# LEDs

COUT (µF)

1000

1 to 3

6.8

>3

4.7

500

1 to 3

10

>3

6.8

200

1 to 3

22

>3

10

Diode Selection

Schottky diodes, with their low forward voltage drop and

fast switching speed, must be used for all LT3596 ap-

plications. Do not use P-N junction diodes. The diode’s

average current rating must exceed the application’s aver-

age current. The diode’s maximum reverse voltage must

exceed the application’s input voltage. Table 4 lists some

recommended Schottky diodes.

Table 4. Recommended Diodes

PART

MAX

CURRENT

(A)

MAX

REVERSE

VOLTAGE

(V)

DFLS160

1

60

CMMSH1-60

1

60

ESIPB

1

100

MANUFACTURER

Diodes, Inc.

www.diodes.com

Central Semiconductor

www.centralsemi.com

Vishay

www.vishay.com

Undervoltage Lockout (UVLO)

EN/UVLO programs the UVLO threshold by connecting the

pin to a resistor divider from VIN as shown in Figure 2.

Select R1 and R2 according to the following equation:

VIN(UVLO)

=

1.51V

•





1+

R2 

R1

3596fa

11

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