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参数资料
| 型号： | LT3466EFE#PBF |
| 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： | 95 |
| 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： | 800kHz ~ 1.3MHz |
| 电源电压： | 2.7 V ~ 24 V |
| 输出电压： | 39.5V |
| 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： | 管件 |
| 工作温度： | -40°C ~ 85°C |
LT3466
OPERATIO
However, the other converter will continue functioning
properly. The photo in Figure 4b shows circuit operation
with converter 1 output open-circuit and converter 2 driv-
ing eight LEDs at 20mA. Converter 1 starts switching at a
lower peak inductor current and begins skipping pulses,
thereby reducing its input current.
V OUT1
10V/DIV
I L1
200mA/DIV
Soft-Start
The LT3466 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 5
shows the start-up waveforms with converter 1 driving
four LEDs at 20mA. The filtered input current, as shown in
Figure 5, is well controlled. The soft-start circuit is less
effective when driving a higher number of LEDs.
200 μ s/DIV
LED1 DISCONNECTED AT THIS INSTANT
V IN = 3.3V
CIRCUIT OF FIGURE 1
3466 F04a
Undervoltage Lockout
The LT3466 has an undervoltage lockout circuit which
Figure 4a. Transient Response of Switcher 1 with LED1
Disconnected from the Output
I L1
50mA/DIV
V SW1
50V/DIV
I L2
100mA/DIV
V SW2
50V/DIV
shuts down both the converters when the input voltage
drops below 2.1V (typ). This prevents the converter from
operating in an erratic mode when powered from low
supply voltages.
I IN
100mA/DIV
V OUT1
5V/DIV
V FB1
200mV/DIV
CRTL1
2V/DIV
V IN = 3.3V
CIRCUIT OF FIGURE 1
LED1 DISCONNECTED
1 μ s/DIV
3466 F04b
V IN = 3.6V
4 LEDs, 20mA
L = 15 μ H
C = 0.47 μ F
100 μ s/DIV
3466 F05
Figure 4b. Switching Waveforms with Output 1 Open-Circuit
Figure 5. Start-Up Waveforms
3466fa
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3467 | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Low Noise High Current LED Charge Pump |
| LT3467A | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Low Noise High Current LED Charge Pump |
| LT3467AEDDB#PBF | 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Cut Tape 1.1A, 2.1MHz Boost Converter |
| LT3467AEDDB#TRMPBF | 功能描述:IC REG BOOST ADJ 1.1A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT3467AEDDB#TRPBF | 功能描述:IC REG BOOST ADJ 1.1A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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