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参数资料
| 型号： | LT3486EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 16TSSOP |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 2 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 200kHz ~ 2.25MHz |
| 电源电压： | 2.5 V ~ 24 V |
| 输出电压： | 36V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LT3486
APPLICATIONS INFORMATION
PWM
10kHz TYP
1μF
TheLEDcurrentcanbesetby:
I LED ≈ (200mV/R FB ), when V CTRL > 1.8V
I LED ≈ (V CTRL /5 ? R FB ), when V CTRL < 1V
Feedback voltage variation versus control voltage is given
in the Typical Performance Characteristics graphs.
(b) Using a Filtered PWM Signal
A variable duty cycle PWM can be used to control the bright-
ness of the LED string. The PWM signal is filtered (Figure
7) by an RC network and fed to the CTRL1, CTRL2 pins.
The corner frequency of R1, C1 should be much lower
than the frequency of the PWM signal. R1 needs to be
much smaller than the internal impedance in the CTRL
pins, which is 100kΩ.
R1 LT3486
10k
CTRL1,2
C1
3486 F07
Figure 7. Dimming Control Using a Filtered PWM Signal
Pulse-Width Modulation (PWM)
Adjusting the forward current flowing in the LEDs changes
the intensity of the LEDs, as explained in the previous sec-
tion. However, a change in forward current also changes the
color of the LEDs. The chromaticity of the LEDs changes
with the change in forward current. Many applications
cannot tolerate any shift in the color of the LEDs. Control-
ling the intensity of the LEDs via applying a PWM signal
allows dimming of the LEDs without changing the color.
Dimming the LEDs via a PWM signal essentially involves
turning the LEDs on and off at the PWM frequency. The
human eye has a limit of 60 frames per second. By in-
creasing the PWM frequency to say, 80Hz, the eye can
be deceived into believing that the pulsed light source is
continously on. Additionally by modulating the duty cycle
(amount of “on-time”), the intensity of the LEDs can be
controlled. The color of the LEDs remains unchanged in
this scheme since the LED current value is either zero or
a constant value.
Figure 8(a) shows a 12V to 8/8 white LED driver. The PWM
dimming control method requires an external NMOS tied
to the cathode of the lowest LED in the string, as shown in
12V (TYP)
9V TO 15V
C IN
10μF
L1
10μH
L2
10μH
C OUT1
2.2μF
D1
5V
C1 1μF
D2
C OUT2
2.2μF
LUXEON
LEDs
LXCL-PWF1
100mA
V IN
OFF ON
SW1
OVP1
CTRL1
SHDN
PWM1
V IN
LT3486
SW2
OVP2
CTRL2
REF
PWM2
V IN
C REF
0.1μF
LUXEON
LEDs
LXCL-PWF1
100mA
I LED
200mA/DIV
I L
500mA/DIV
V IN = 12V
0.2ms/DIV
PWM
FREQ
1kHz
DIMMING
INPUT 1
Q1
FB1
V C1
3.65k
2.2nF
21.5k
R T
FB2
V C2
22pF
3.65k
2.2nF
Q2
DIMMING
INPUT 2
PWM
FREQ?
1kHz
PWM
5V/DIV
3486 G18
8/8 LEDs
PWM FREQ = 1kHz
Figure 8b. PWM Dimming Waveforms
C IN : 25V, X5R OR X7R
100k
R FB1 C OUT1 , C OUT2 : 35V, X5R OR X7R
2
C1: 10V, X5R OR X7R
C REF : 6.3V, X5R OR X7R
D1, D2: ZETEX ZLLS1000
L1, L2: TOKO D53LC (TYPE A)
Q1, Q2: FAIRCHILD FDN5630
R FB2
2
3486 TA10a
100k
Figure 8a. 12V to 8/8 White LEDs
3486fe
13
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