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参数资料
| 型号： | LT3598IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24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
35
30
25
20
15
10
5
R ISET = 9.76k
For wide PWM dimming range, higher switching freq-
uency and lower PWM frequency con?guration are
needed. Special considerations are required for component
selection and compensation network. Please contact
factory for optimized components selection if very high
dimming ratio is desired.
LED Current Derating Using the CTRL Pin
A useful feature of the LT3598 is its ability to program
0
0
0.2
0.4
0.6 0.8
CTRL (V)
1
1.2
1.4
1.6
3598 F04
a derating curve for maximum LED current versus
temperature. LED data sheets provide curves of maximum-
allowable LED current versus temperature to warn against
Figure 4. LED Current vs CTRL Voltage
exceeding this current limit and damaging the LED. The
LT3598 allows the output LEDs to be programmed for
R2
V REF
LT3598
maximum allowable current while still protecting the
LEDs from excessive currents at high temperature. This
is achieved by programming a voltage at the CTRL pin
CTRL
R1
3598 F05
Figure 5. LED Current vs CTRL
with a negative temperature coef?cient using a resistor
divider with temperature dependent resistance (Figure 7).
As ambient temperature increases, the CTRL voltage will
fall below the internal 1V voltage reference, causing LED
currents to be controlled by the CTRL pin voltage. The LED
current curve breakpoint and slope versus temperature
PWM
T PWM
TON PWM
(= 1/f PWM )
is de?ned by the choice of resistor ratios and use of
temperature-dependent resistance in the divider for the
CTRL pin.
Table 5 shows a list of manufacturers/distributors of
INDUCTOR
CURRENT
NTC resistors. There are several other manufacturers
available and the chosen supplier should be contacted
for more detailed information. If an NTC resistor is used
LED
CURRENT
MAX I LED
3598 F06
to indicate LED temperature, it is effective only if the
resistor is connected as closely as possible to the LED
strings. LED derating curves shown by manufacturers are
Figure 6. LED Current Using PWM Dimming
For True Color PWM TM dimming, the LT3598 provides up
to a 3000:1 PWM dimming range. This is achieved by
allowing the duty cycle of the PWM pin (connected to
the IC and an internal switch in series with the LED(s)),
to be reduced from 100% to as low as 0.1% for a PWM
frequency of 100Hz (Figure 6). PWM duty cycle dimming
allows for constant LED color to be maintained over the
entire dimming range.
listed for ambient temperature. The NTC resistor should
have the same ambient temperature as the LEDs. Since
the temperature dependency of an NTC resistor can be
nonlinear over a wide range of temperatures, it is important
to obtain a resistor’s exact value over temperature from
the manufacturer. Hand calculations of CTRL voltage can
then be performed at each given temperature, resulting
in the CTRL versus temperature plotted curve. Several
iterations of resistor value calculations may be required
to achieve the desired breakpoint and slope of the LED
current derating curve.
3598fb
12
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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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