收藏本站
LT3596
APPLICATIONS INFORMATION
R1
For True Color PWM dimming, the LT3596 provides up
to 10,000:1 PWM dimming range at 100Hz. This is done
by reducing the duty cycle of the PWM n pin from 100%
to 0.01% for a PWM frequency of 100Hz (see Figure 5).
This equates to a minimum on time of 1μs and a maxi-
mum period of 10ms. PWM duty cycle dimming allows
for constant LED color to be maintained over the entire
dimming range.
V REF
R2 LT3596
TSET
3596 F06
Figure 6. Programming the TSET Pin
Table 6. TSET Programmed Junction Temperature
t ON(PWM)
t PWM
T J (°C)
85
100
115
R1 (kΩ)
49.9
49.9
49.9
R2 (kΩ)
97.6
90.9
84.5
LED1-3
CURRENT
MAX I LED
Figure 5. LED Current Using PWM Dimming
3596 F05
The TSET pin must be tied to V REF if the temperature
protection feature is not desired.
0.8
0.7
Using the TSET Pin for Thermal Protection
The LT3596 contains a special programmable thermal
regulation loop that limits the internal junction tempera-
ture. This thermal regulation feature provides important
protection at high ambient temperatures. It allows an
application to be optimized for typical, not worst-case,
ambient temperatures with the assurance that the LT3596
automatically protects itself and the LED strings under
worst-case conditions.
0.6
0.5
0.4
0.3
–50
–25
0 25 50 75
TEMPERATURE (°C)
100 125
3596 F07
As the ambient temperature increases, so does the internal
junction temperature of the part. Once the programmed
maximum junction temperature is reached, the LT3596
linearly reduces the LED current, as needed, to maintain
this junction temperature. This is only achieved when
the ambient temperature stays below the maximum pro-
grammed junction temperature. If the ambient temperature
continues to rise above the programmed maximum junc-
tion temperature, the LED current will reduce to less than
10% of the full current.
A resistor divider from the V REF pin programs the maximum
IC junction temperature as shown in Figure 6.
Table 6 shows commonly used values for R1 and R2.
Choose the ratio of R1 and R2 for the desired junction
temperature limit as shown in Figure 7.
Figure 7. V TSET for LED Current Derating
LED Current Derating Using the CTRLM Pin
A useful feature of the LT3596 is its ability to program
a derating curve for maximum LED current versus tem-
perature. LED data sheets provide curves of maximum
allowable LED current versus temperature to warn against
exceeding this current limit and damaging the LED. The
LT3596 allows the output LEDs to be programmed for
maximum allowable current while still protecting the
LEDs from excessive currents at high temperature. This
is achieved by programming a voltage at the CTRLM pin
with a negative temperature coefficient using a resistor
divider with temperature-dependent resistance (Figure 8).
As ambient temperature increases, the CTRLM voltage
falls below the internal 1V voltage reference, causing
3596fa
  
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
LT3597EUHG#PBF IC LED DRIVER TRPL STP DWN 52QFN
LT3598IUF#PBF IC LED DRIVR WHITE BCKLGT 24-QFN
LT3599IFE#PBF IC LED DRVR WHITE BCKLGT 28TSSOP
LT3743EFE#PBF IC LED DVR HP CONST CURR 28TSSOP
LT3745IUJ#TRPBF IC LED DVR 16CH 50MA 40QFN
LT3746IUHH#TRPBF IC LED DRIVER 32CHANNEL 56-QFN
LT3754IUH#TRPBF IC LED DVR 16CH 50MA 32QFN
LT3755EMSE#PBF IC LED DRVR HP CONS CURR 16-MSOP
相关代理商/技术参数
LT3596EUHG#TRPBF 功能描述:IC LED DVR 300MA ADJ 52-VQFN 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
LT3596EUHG-PBF 制造商:LINER 制造商全称:Linear Technology 功能描述:60V Step-Down LED Driver
LT3596IUHG#PBF 功能描述:IC LED DVR 300MA ADJ 52-VQFN 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
LT3596IUHG#TRPBF 功能描述:IC LED DVR 300MA ADJ 52-VQFN 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
LT3597 制造商:LINER 制造商全称:Linear Technology 功能描述:60V Triple Step-Down LED Driver Programmable Temperature Protection
LT3597EUHG#PBF 功能描述:IC LED DRIVER TRPL STP DWN 52QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C
LT3597EUHG#TRPBF 功能描述:IC LED DRIVER 60V TRIPLE 52-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
LT3597IUHG#PBF 功能描述:IC LED DRIVER 60V TRIPLE 52-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