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参数资料
| 型号： | LT3486EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/20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
the figure. A PWM logic input is applied to the gate of the
NMOS and the PWM pin of the LT3486. When the PWM
input is taken high, the LEDs are connected to the R FB
resistor and a current I LED = 200mV/R FB flows through
the LEDs. When the PWM input is taken low, the LEDs are
disconnected and turn off. The low PWM input applied to
the LT3486 ensures that the respective converter turns
off and its V C pin goes high impedance. This ensures that
the capacitor connected to the V C pin retains its voltage
which in turn allows the LEDs to turn on faster, as shown
in Figure 8(b). The CTRL pin is not used to modulate the
LED current in the scheme. It can be connected to a sup-
ply voltage greater than 1.8V.
The dimming control pins (PWM1, PWM2) can be used
to extend the dimming range for the individual switching
converters. The LED current can be controlled down to
μA levels by feeding a PWM signal with frequencies in the
range of 80Hz to 50kHz. The LED current can be controlled
by PWM frequencies above 50kHz but the controllable
current decreases with increasing frequency. Pulling the
PWM pins below 0.4V disables the respective switcher.
Taking it higher than 0.9V resumes normal operation.
Connect these pins to 0.9V or higher if not in use.
Figure 9 shows the LED current variation vs PWM duty
cycle. The LED current is controlled by applying a PWM of
frequency 100Hz, 1kHz and 25kHz to the circuit of Figure 8a.
As seen in the curves, the LED string is able to get a wide
(1000:1) dimming range with PWM frequency of 100Hz.
The dimming range decreases as PWM frequency goes up.
Board Layout Consideration
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
To prevent electromagnetic interference (EMI) problems,
proper layout of high frequency switching paths is essential.
Minimize the length and area of all traces connected to the
switching node pins (SW1 and SW2). Keep the feedback
pins (FB1 and FB2) away from the switching nodes.
The DFN and FE packages both have an exposed paddle
that must be connected to the system ground. The
ground connection for the feedback resistors should
be tied directly to the ground plane and not shared with
any other component, except the R T resistor, ensuring a
clean, noise-free connection. Recommended component
placement for the DFN package is shown in the Figure 10.
VIAs TO V IN PLANE
OVP1
V OUT1
V OUT2
REF
100
10
R T
OVP2
SHDN
1
V C1
V IN
SW1
1
2
3
4
17
16
15
14
13
SW2
V IN
V C2
5
6
12
11
0.1
0.01
0.01
PWM FREQ = 100Hz
PWM FREQ = 1kHz
PWM FREQ = 25kHz
0.1 1 10 100
PWM DUTY CYCLE (%)
FB1
LED1
PWM1
CTRL1
7
8
V IN
10
9
CTRL2
LED2
PWM2
FB2
3486 F10
3486 F09
VIAs TO V IN PLANE
VIAs TO GROUND PLANE
Figure 9. LED Current Variation vs PWM Duty Cycle
Figure 10. Recommended Layout for LT3486
3486fe
14
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| LT3486IFE#PBF | 功能描述:IC LED DRVR WHITE BCKLGT 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称: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 |
| LT3486IFE#TRPBF | 功能描述:IC LED DRVR WHITE BCKLGT 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3487 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost and Inverting Switching Regulator for CCD Bias |
| LT3487EDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost and Inverting Switching Regulator for CCD Bias |
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