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参数资料
| 型号： | LT3478IFE-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONS CURR 16TSSOP |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 颜色，白色 LED |
| 频率： | 200kHz ~ 2.25MHz |
| 电源电压： | 2.8 V ~ 36 V |
| 输出电压： | 42V |
| 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 ~ 125°C |
LT3478/LT3478-1
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3478EFE/LT3478EFE-1 are guaranteed to meet performance
speci?cations from 0°C to 125°C junction temperature. Speci?cations over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LT3478IFE/LT3478IFE-1 are guaranteed over the full –40°C to 125°C
operating junction temperature range.
Note 3: This IC includes over-temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when over-temperature protection is active.
Continuous operation above the speci?ed maximum operating junction
temperature may impair device reliability.
Note 4: For maximum operating ambient temperature, see the “Thermal
Calculations” section in the Applications Information section.
Note 5: The maximum operational voltage for V IN is limited by thermal and
ef?ciency considerations. Power switch base current is delivered from V IN
and should therefore be driven from the lowest available power supply in
the system. See “Thermal Calculations” in the Applications Information
section.
Note 6: For LT3478, parameter scales ? (R SENSE /0.1 Ω ).
TYPICAL PERFOR A CE CHARACTERISTICS
LED Current vs PWM Duty Cycle
Wide PWM Dimming Range
LED Current vs CTRL1
LED Current vs Temperature
(3000:1)
1400
1050
700
T A = 25 ° C
CTRL2 = V REF
(FOR LT3478 SCALE BY 0.1 ? /R SENSE )
LT3478-1
1400
1050
700
(FOR LT3478 SCALE BY 0.1 ? /R SENSE )
I LED = 1050mA, CTRL1 = CTRL2 = V REF
LT3478-1
1000
100
10
T A = 25 ° C
V IN = V S = 12V
6 LEDS AT 500mA
PWM FREQ = 100Hz
CTRL1 = 0.5V
CTRL2 = V REF
F OSC = 1.6MHz
L = 2.2 μ H
350
V REF
350
I LED = 100mA, CTRL1 = 100mV,
CTRL2 = V REF
1
0
0
0.35
0.70
1.05
1.40
0
–50 –25 0 25
50 75 100
125
0
0.01
0.1
1 10
100
CTRL1 (V)
CTRL1 Pin Current vs
Temperature
3478 G01
JUNCTION TEMPERATURE ( ° C)
Switch V CE (SAT) vs Switch
Current
3478 G02
PWM DUTY CYCLE (%)
3478 G03
Switch and Inductor Peak Current
Limits vs Temperature
50
240
T A = 25 ° C
7.0
40
CTRL1 = 0.1V
210
6.5
30
20 CTRL2 = V REF
CTRL1 = 0.35V
180
120
6.0
5.5
SWITCH
INDUCTOR
CTRL1 AND CTRL2 PINS
INTERCHANGEABLE
10
0
CTRL1 = 0.7V
CTRL1 = 0.9V
60
0
5.0
4.5
–50 –25 0 25
50 75 100
125
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
–50 –25 0 25
50 75 100
125
JUNCTION TEMPERATURE ( ° C)
3478 G04
SWITCH CURRENT (A)
3478 G05
JUNCTION TEMPERATURE ( ° C)
3478 G06
34781f
4
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| LT3479EDE#TRPBF | 功能描述:IC REG BOOST INV ADJ 3A 14DFN 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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