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参数资料
| 型号： | LT3598IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/24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
Overvoltage Protection
The LT3598 uses the FB pin to provide regulated overvoltage
protection when all LED strings are open. A resistor divider
is connected between the V O_SW pin and ground (Figure 2).
There is an internal PMOS switch between V OUT and
V O_SW , which is controlled by the PWM signal. The PMOS
switch addition prevents the feedback resistor divider from
draining the output capacitor during PWM off-period,
allowing for a higher dimming range without falsely tripping
the OPENLED ?ag. It also reduces the system current in
shutdown. This PMOS has about 1k resistance, so select
FB resistors taking this resistance into account.
To set the maximum output voltage, select the values
of R1 and R2 (see Figure 2) according to the following
The output voltage should be set 15% higher than the
normal LED string operating voltage. Under normal
operation, LED1 to LED6 pin voltages are monitored and
provide feedback information to the converter for output
voltage regulation given the programmed LED current.
The maximum output regulation loop is activated only
when all LEDs are open.
Programming Maximum LED Current
Maximum LED current is programmed by placing a resistor
between the I SET pin and ground (R ISET ). The I SET pin
resistor can be selected from 10k to 100k.
The LED current is programmed according to the following
equation:
V OUT ( MAX ) = 1 . 230 V ? 1 +
equation:
?
?
LT3598
R2 ?
?
R 1 ?
V OUT
294 V
I LED ≈
R ISET
See Table 4 and Figure 3 for resistor values and corr-
esponding programmed LED current.
LED current can also be adjusted by programming the
CTRL pin voltage.
V O_SW
R2
Table 4. R ISET Value Selection for LED Current
FB
R1
3598 F02
Figure 2. Overvoltage Protection
Voltage Feedback Connections
LED CURRENT (mA)
3mA
10mA
20mA
30mA
RESISTOR ON I SET PIN (k)
97.6
29.4
14.7
9.76
30
25
20
15
10
5
LED Current Dimming
Two different types of dimming control can be used with
the LT3598. The LED current can be set by modulating
the CTRL pin or the PWM pin.
For some applications, a variable DC voltage that adjusts
the LED current is the preferred method of brightness
control. The CTRL pin voltage can be modulated to set
the dimming of the LED string (see Figures 4 and 5). As
the voltage on the CTRL pin increases from 0V to 1.0V,
0
0
20
40 60
R ISET (k)
80
100
3598 F03
the LED current increases from 0 to the programmed LED
current level. As the CTRL pin voltage increases beyond
1V, it has no effect on the LED current .
Figure 3. R ISET Value Selection for LED Current
3598fb
11
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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 |
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