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參數(shù)資料
| 型號： | LT3486EFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual 1.3A White LED Step-Up Converters with Wide Dimming |
| 中文描述： | 1.3 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 839K |
| 代理商： | LT3486EFE |
LT3486
11
3486f
Figure 6b. Efficiency Comparison for Different R
T
Resistors
Inductor Selection
The choice of the inductor will depend on the selection of
switching frequency of LT3486. The switching frequency
can be programmed from 200kHz to 2MHz. Higher switch-
ing frequency allows the use of smaller inductors albeit
at the cost of increased switching losses.
The inductor current ripple (
Δ
I
L
), neglecting the drop across
the Schottky diode and the switch, is given by:
where:
L = Inductor
f = Operating frequency
V
IN(MIN)
= Minimum input voltage
V
OUT(MAX)
= Maximum output voltage
The
Δ
I
L
is typically set to 20% to 40% of the maximum
inductor current.
The inductor should have a saturation current rating greater
than the peak inductor current required for the application.
Also, ensure that the inductor has a low DCR (copper wire
resistance) to minimize I
2
R power losses. Recommended
inductor values range from 4.7μH to 22μH.
=
(
OUT MAX
(
)
I
V
V
V
V
f L
L
IN MIN
(
OUT MAX
(
IN MIN
(
)
)
)
)
–
Several inductors that work well with the LT3486 are listed
in Table 1. Consult each manufacturer for more detailed in-
formation and for their entire selection of related parts.
Table 1. Recommended Inductors
MAX
L
DCR
PART
(μH)
(
Ω
)
LQH55DN150M
15
0.150
LQH55DN220M
22
0.190
A915AY-4R7M
4.7
0.045
A915AY-6R8M
6.8
0.068
A915AY-100M
10
0.090
A918CY-100M
10
0.098
A918CY-150M
15
0.149
CDRH4D28-100
10
0.048
CDRH5D18-150
15
0.145
Capacitor Selection
The small size of ceramic capacitors make them ideal
for LT3486 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 4.7μF or larger input capacitor is sufficient for
most applications. Always use a capacitor with sufficient
voltage rating.
Table 2 shows a list of several ceramic capacitor manufac-
turers. Consult the manufacturers for detailed information
on their entire selection of ceramic parts.
CURRENT
RATING
(A)
1.40
1.20
2.49
2.01
1.77
1.22
0.94
1.30
0.97
VENDOR
Murata
(814) 237-1431
www.murata.com
Toko
(847) 297-0070
www.toko.com
Sumida
(847) 956-0666
www.sumida.com
Table 2. 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
Diode Selection
Schottky diodes with their low forward voltage drop and
fast reverse recovery, are the ideal choices for LT3486
applications. The diode conducts current only during the
switch off time. The peak reverse voltage that the diode
must withstand is equal to the regulator output voltage.
APPLICATIU
W
U
U
LED CURRENT (mA)
0
30
E
40
50
60
70
80
90
5
10
15
20
3486 F06b
25
V
= 5V
8/8 LEDs
R
T
= 63.4k
R
T
= 21.5k
R
T
= 39.1k
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| LT3486EFE#PBF | 功能描述:IC LED DRVR WHITE BCKLGT 16TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?線性（LDO），PWM，升壓（升壓） 輸出數(shù):8 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:RGB，白色 LED 頻率:500kHz ~ 1.5MHz 電源電壓:4.75 V ~ 26 V 輸出電壓:45V 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* 工作溫度:-40°C ~ 85°C |
| LT3486EFE#TRPBF | 功能描述:IC LED DRVR WHITE BCKLGT 16TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3486EFEPBF | 制造商:Linear Technology 功能描述:Dual 1.3A White LED dim driver,LT3486 |
| LT3486IFE#PBF | 功能描述:IC LED DRVR WHITE BCKLGT 16TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3486IFE#PBF | 制造商:Linear Technology 功能描述:LED DRIVER BOOST PWM 1MHZ 制造商:Linear Technology 功能描述:LED DRIVER, BOOST, PWM, 1MHZ, TSSOP-16 |
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