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参数资料
| 型号： | LT3486EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/20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
OPERATION
V IN = 3.6V
100μs/DIV
LED1 DISCONNECTED
AT THIS INSTANT
outputopencircuitareshownintheTypicalPerformance
Characteristics graphs.
Figure 3a shows the transient response of switcher 1 with
the LEDs disconnected from the output. When the LED1
string is disconnected from the output, the voltage at the
feedback pin (FB1) drops to 0V. As a result, the error
amplifier charges up the V C node to the clamp voltage
level of 1.5V (typ). The converter starts switching at peak
current limit and ramps up the output voltage. When the
output voltage reaches the OVP clamp voltage level of 36V
(typ), the LT3486 shuts off the converter by pulling the V C
node to ground. The converter then regulates the output
voltage at 36V (typ) by switching at a very low frequency.
In the event one of the converters has an output open-
circuit, its output voltage will be clamped at 36V (typ).
However, the other converter will continue functioning
properly. The photo in Figure 3b shows circuit operation
with converter 1 output open-circuit and converter 2
driving eight LEDs at 25mA. Converter 1 starts switching
at a very low frequency, reducing its input current.
I L1
1A/DIV
V OUT1
20V/DIV
V C1
2V/DIV
3486 F03a
CIRCUIT OF
FRONT PAGE
APPLICATION
Figure 3a. Transient Response of Switcher 1 with LED1
Disconnected from the Output
I L1
1A/DIV
V OUT1
1V/DIV
AC COUPLED
I L2
500mA/DIV
Soft-Start
The LT3486 has a separate internal soft-start circuitry for
each converter. Soft-start helps to limit the inrush current
during start-up. Soft-start is achieved by clamping the
output of the error amplifier during the soft-start period.
This limits the peak inductor current and ramps up the
output voltage in a controlled manner.
The converter enters into soft-start mode whenever
the respective CTRL pin is pulled from low to high.
Figure 4 shows the start-up waveforms with con-
verter 2 driving eight LEDs at 25mA. The filtered input
current, as shown in Figure 4, is well controlled. The
soft-start circuit is more effective when driving a smaller
number of LEDs.
Undervoltage Lockout
The LT3486 has an undervoltage lockout circuit which
shuts down both the converters when the input voltage
drops below 2.1V (typ). This prevents the converter
to operate in an erratic mode when powered from low
supply voltages.
Overtemperature Protection
The maximum allowable junction temperature for
LT3486 is 125°C. In normal operation, the IC’s junction
temperature should be kept below 125°C at an ambient
temperature of 85°C or less. If the junction tempera-
ture exceeds 150°C, the internal thermal shutdown
circuitry kicks in and turns off both the converters.
The converters will remain off until the die temperature
falls below 150°C.
I IN
200mA/DIV
V OUT2
10V/DIV
V FB2
200mV/DIV
CTRL2
5V/DIV
V IN = 3.6V 2ms/DIV
CIRCUIT OF FRONT PAGE APPLICATION
LED1 DISCONNECTED
3486 F03b
V IN = 3.6V 0.5ms/DIV
8 LEDs, 25mA
CIRCUIT OF FRONT PAGE APPLICATION
3486 F04
Figure 3b. Switching Waveforms with Output 1 Open Circuit
Figure 4. Start-Up Waveforms
3486fe
9
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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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