- 您现在的位置：买卖IC网 > PDF目录20862 > LT3598IFE#PBF (Linear Technology)IC LED DRVR WHITE BCKLGT 24TSSOP PDF资料下载
参数资料
| 型号： | LT3598IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 24TSSOP |
| 标准包装： | 62 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 200kHz ~ 2.5MHz |
| 电源电压： | 3 V ~ 30 V |
| 输出电压： | 44V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
LT3598
APPLICATIONS INFORMATION
Table 5. NTC Resistor Manufacturers/Distributors
(which means a higher junction temperature). Being able
Murata Electronics North America
TDK Corporation
Digi-Key
770-436-1300
www.murata.com
516-535-2600
www.tdk.com
800-344-4539
www.digikey.com
to limit the maximum junction temperature allows the
bene?ts of this topology to be fully realized. This thermal
regulation feature provides important protection at high
ambient temperatures, and allows a given application
to be optimized for typical, not worst-case, ambient
temperatures with the assurance that the LT3598 will
If calculating the CTRL voltage at various temperatures
gives a downward slope that is too strong, alternative
resistor networks can be chosen (B, C, D in Figure 7)
which use temperature independent resistance to reduce
the effects of the NTC resistor overtemperature.
Murata Electronics provides a selection of NTC resistors
with complete data over a wide range of temperatures.
In addition, a software tool is available which allows the
user to select from different resistor networks and NTC
resistor values, and then simulate the exact output voltage
curve (CTRL behavior) overtemperature. Referred to as the
“Murata Chip NTC Thermistor Output Voltage Simulator,”
users can log onto www.murata.com and download
the software followed by instructions for creating an
output voltage V OUT (CTRL) from a speci?ed V CC supply
(V REF ).
Using the T SET Pin for Thermal Protection
The LT3598 contains a special programmable thermal
regulation loop that limits the internal junction temperature
of the part. Since the LT3598 topology consists of a single
boost converter with six linear current sources, any LED
string voltage mismatch will cause additional power to
be dissipated in the package. This topology provides
excellent current matching between LED strings and allows
a single power stage to drive a large number of LEDs, but
at the price of additional power dissipation inside the part
automatically protect itself and the LED strings under
worst-case conditions.
The operation of the thermal loop is simple. As the ambient
temperature increases, so does the internal junction
temperature of the part. An internal voltage is developed
that’s proportional to the junction temperature (V PTAT ).
Once the programmed maximum junction temperature
is reached, the LT3598 begins to linearly reduce the LED
current, as needed, to try and maintain this temperature.
This can only be achieved when the ambient temperature
stays below the desired maximum junction temperature.
If the ambient temperature continues to rise past the
programmed maximum junction temperature, the LEDs
current will be reduced to approximately 5% of the full
LED current.
While this feature is intended to directly protect the LT3598,
it can also be used to derate the LED current at high
temperatures. Since there is a direct relationship between
the LED temperature and LT3598 junction temperature, the
TSET function also provides some LED current derating
at high temperatures.
Two external resistors program the maximum IC junction
temperature using a resistor divider from the V REF pin,
as shown in Figure 8. Choose the ratio of R1 and R2 for
the desired junction temperature. Figure 9 shows the
relationship of T SET voltage to junction temperature, and
Table 6 shows commonly used values for R1 and R2.
R2
V REF
LT3598
R Y
R Y
CTRL
R NTC
R NTC
R X R NTC
R NTC
R X
R1
(OPTION A TO D)
A
B
C
D
3598 F07
Figure 7 . LED Current Derating vs Temperature Using NTC Resistor
3598fb
13
相关PDF资料 |
PDF描述 |
|---|---|
| LT3474IFE-1#TRPBF | IC LED DRVR HP CONS CURR 16TSSOP |
| LT3956EUHE#TRPBF | IC LED DVR BUCK BOOST 36-VQFN |
| XLN3640-GL | POWER SUPPLY PROGRAM DC 36V/40A |
| REC8-243.3SRW/H2/A/M | CONV DC/DC 8W 24VIN 3.3VOUT |
| EBC13DRTH | CONN EDGECARD 26POS DIP .100 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3598IFETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6-String 30mA LED Driver with 1.5% Current Matching |
| LT3598IUF#PBF | 功能描述:IC LED DRIVR WHITE BCKLGT 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| LT3598IUF#TRPBF | 功能描述:IC LED DRIVR WHITE BCKLGT 24-QFN 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 |
| LT3598IUFPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6-String 30mA LED Driver with 1.5% Current Matching |
| LT3598IUF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6-String 30mA LED Driver with 1.5% Current Matching |
发布紧急采购，3分钟左右您将得到回复。