- 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： | 14/24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 6. T SET Junction Temperature
Programming Switching Frequency
T J (°C)
90
100
110
120
R1
100k
100k
100k
100k
R2
68.1k
63.4k
59k
54.9k
The switching frequency of the LT3598 should be
programmed between 200kHz and 2.5MHz by an external
resistor connected between the RT pin and ground. Do not
leave this pin open. See Table 7 and Figure 10 for resistor
values and corresponding frequencies.
Selecting the optimum switching frequency depends
on several factors. Inductor size is reduced with higher
V REF
frequency, but ef?ciency drops slightly due to higher
R2
LT3598
switching losses. In addition, some applications require
T SET
R1
3598 F08
Figure 8. Programming the T SET Pin
900
850
800
very high duty cycles to drive a large number of LEDs from
a low supply. Low switching frequency allows a greater
operational duty cycle and, hence, a greater number of
LEDs to be driven. In each case, the switching frequency
can be tailored to provide the optimum solution. When
programming the switching frequency, the total power
losses within the IC should be considered.
Table 7. Switching Frequency
750
700
650
600
550
SWITCHING FREQUENCY (MHz)
2.5
2
1.5
1
0.5
R T (k)
14.7
20.5
29.4
51.1
105
500
0
25
50
75
100 125
150
0.2
301
2.5
2.0
1.5
1.0
0.5
JUNCTION TEMPERATURE (°C)
Figure 9. T SET Pin Threshold
3598 F09
Switching Frequency Synchronization
The nominal operating frequency of the LT3598 is
programmed using a resistor from the RT pin to ground
and can be controlled over a 200kHz to 2.5MHz range. In
addition, the internal oscillator can be synchronized to an
external clock applied to the SYNC pin. The synchronizing
clock signal input to the LT3598 must have a frequency
between 250kHz and 3MHz, a duty cycle between 20% and
80%, a low state below 0.4V and a high state above 1.5V.
Synchronization signals outside of these parameters will
cause erratic switching behavior. For proper operation,
an R T resistor should be chosen to program a switching
0
10
100
R T (k)
1000
3598 F10
frequency 20% slower than the SYNC pulse frequency.
Synchronization occurs at a ?xed delay after the rising
edge of SYNC.
Figure 10. Switching Frequency
3598fb
14
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。