收藏本站
LT3593
OPERATION
The LT3593 uses a constant frequency, current mode
control boost scheme to provide excellent line and load
regulation. Operation can be best understood by referring
to the Block Diagram in Figure 1.
Output Disconnect
An internal switch connects between the CAP pin and the
LED pin. The top of the LED string is connected to the
LED pin. The string can be terminated to ground or to
V IN if a low number of LEDs are driven. When the part is
in shutdown, the switch is off; allowing no current to run
through the LEDs.
Current Programming
The LED current can be set to 32 different values
(625μA – 20mA) by strobing the CTRL pin. A 5-bit
counter is decremented by 1 on a CTRL pin rising edge,
reducing the programmed current by 625μA each time.
CTRL
CTRL
CTRL
CTRL
The desired current can be calculated by:
I LED = 20mA – (N – 1) ? 625μA
where N is the number of rising edges. When the desired
current setting is reached, the CTRL pin must stay high.
128μs after the last rising edge on the CTRL pin, the
regulator will enable the output and start to regulate the
LED current to the programmed value. Figure 2 shows
an example of how the part can be programmed.
If a different current is desired, the CTRL pin can be strobed
again. The ?rst falling edge will reset the internal register
to the 20mA setting. While the new current is being pro-
grammed, the device will continue to regulate the previously
programmed value until the CTRL pin has remained high
for at least 128μs, at which time the regulated current will
slew to the newly programmed value. Figure 3 shows how
to program a new LED current level.
If the CTRL pin is held low for longer than 128μs, the part
will go into the shutdown mode.
FULL CURRENT
20mA
17.5mA
15mA
12.5mA
3593 F02
Figure 2. Current Programming
CTRL
128μs
128μs
128μs
20mA
20mA
17.5mA
17.5mA
LED
CURRENT
Figure 3. Current Programming and Shutdown Timing
SHDN
3593 F03
3593f
7
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
LT3595AEUHH#TRPBF IC LED DRIVR WHITE BCKLGT 56-QFN
LT3595EUHH#TRPBF IC LED DRIVR WHITE BCKLGT 56-QFN
LT3596EUHG#PBF IC LED DVR 300MA ADJ 52-VQFN
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
相关代理商/技术参数
LT3593ES6#TRPBF 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-6 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
LT3593ES6-PBF 制造商:LINER 制造商全称:Linear Technology 功能描述:1MHz White LED Driver with Output Disconnect and One Pin Current Programming
LT3593ES6-TRPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:1MHz White LED Driver with Output Disconnect and One Pin Current Programming
LT3595 制造商:LINER 制造商全称:Linear Technology 功能描述:16 Channel Buck Mode LED Driver
LT3595A 制造商:LINER 制造商全称:Linear Technology 功能描述:16 Channel Buck Mode LED Driver
LT3595AEUHH#PBF 功能描述:IC LED DRIVR WHITE BCKLGT 56-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
LT3595AEUHH#TRPBF 功能描述:IC LED DRIVR WHITE BCKLGT 56-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
LT3595AEUHHPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:16 Channel Buck Mode LED Driver