LT3593ES6 查看數據表（PDF） - Linear Technology

零件编号

产品描述 (功能)

比赛名单

LT3593ES6

1MHz White LED Driver with Output Disconnect and One Pin Current Programming

Linear Technology 

LT3593

APPLICATIONS INFORMATION

Inductor Selection

A 10μH inductor is recommended for most LT3593 ap-

plications. Although small size and high efficiency are

major concerns, the inductor should have low core losses

at 1MHz and low DCR (copper wire resistance). Some

inductors in this category with small size are listed in

Table 1. The efficiency comparison of different inductors

is shown in Figure 4.

Table 1. Recommended Inductors

PART

LQH43CN100

LQH32CN100

NR3010T100M

L DCR

(μH) (Ω)

10 0.24

10 0.44

10 0.45

CURRENT

RATING

(mA)

650

450

500

VENDOR

Murata

Taiyo Yuden

VLF4012AT-100M

VLF3010AT-100M

10 0.20

10 0.58

DE2812-1098AS-100M 10 0.29

DB3015C-1068AS-100M 10 0.38

500 TDK

490

580 TOKO

400

90.00

80.00

70.00

60.00

50.00

40.00

30.00

0.00

NR3010T100M

VLF4012-AT-100MR50

LQH43CN100K03

VLF3010AT-100MR49

LQH32CN100K53

DB3015C-1068AS-100M

5.00

10.00 15.00

LED CURRENT (mA)

20.00

3593 F04

Figure 4. Efficiency Comparison of Different Inductors

Capacitor Selection

The small size of ceramic capacitors makes them ideal

for LT3593 applications. Use only X5R and X7R types

because they retain their capacitance over wider voltage

and temperature ranges than other types such as Y5V or

Z5U. A 1μF input capacitor and a 1μF output capacitor are

sufficient for most applications.

8

Table 2 shows a list of several ceramic capacitor manufac-

turers. Consult the manufacturers for detailed information

on their entire selection of ceramic parts.

Table 2. Recommended Ceramic Capacitor Manufacturers

Taiyo Yuden

(408) 573-4150

www.t-yuden.com

AVX

(803) 448-9411

www.avxcorp.com

Murata

(714) 852-2001

www.murata.com

Kemet

(408) 986-0424

www.kemet.com

Diode Selection

Schottky diodes, with their low forward voltage drop and

fast reverse recovery, are the ideal choices for LT3593 ap-

plications. The forward voltage drop of a Schottky diode

represents the conduction losses in the diode, while the

diode capacitance (CT or CD) represents the switching

losses. For diode selection, both forward voltage drop and

diode capacitance need to be considered. Schottky diodes

with higher current ratings usually have lower forward

voltage drop and larger diode capacitance, which can

cause significant switching losses at the 1.0MHz switching

frequency of the LT3593. A Schottky diode rated at 400mA

to 500mA is sufficient for most LT3593 applications. Some

recommended Schottky diodes are listed in Table 3.

Table 3. Recommended Schottky Diodes

PART

NUMBER

FORWARD VOLTAGE DIODE

CURRENT DROP CAPACITANCE

(mA)

(V)

(pF) MANUFACTURER

CMDSH05-4 500

CMMSH1-40 1000

0.47 at

500mA

0.55 at

1A

50 at 1V

80 at 4V

Central

631-435-1110

www.centralsemi.com

ZLL5400

520 0.50 at 15 at 30V Zetex

400mA

631-543-7100

www.zetex.com

PMEG-

4005AEA

500 0.47 at 50 at 1V Phillips

500mA

+3140 27 24825

www.semiconductors.

phillips.com

3593f

Share Link: