收藏本站
LT3595A
OPERATION
The LT3595A uses a constant-frequency, current mode
control scheme to provide excellent line and load regula-
tion. Operation is best understood by referring to the Block
Diagram. The oscillator, V-I converter and internal regulator
4.5V input voltage or by its maximum duty cycle. The duty
cycle is the fraction of time that the internal switch is on
divided by the total period. It is determined by the input
voltage and the voltage across the LEDs:
are shared by the sixteen converters. The control circuitry,
power switches, PWM comparators and Dimming Feedback
Control (DFC) blocks are identical for all converters.
DC =
V LED + V D
V VIN ? V CESAT + V D
The LT3595A enters shutdown mode when the SHDN
pin is lower than 400mV. If the SHDN pin is above 1.6V,
then the LT3595A turns on. At the start of each oscillator
cycle, the power switch is turned on. Current ramps up
where V LED is the voltage drop across the LEDs, V D is
the Schottky forward drop, and V CESAT is the saturation
voltage of the internal switch. This leads to a minimum
input voltage of:
through the output capacitor, the inductor, and the switch
to ground. When the voltage across the output capacitor
is larger than the LEDs’ forward voltage, current ?ows
V IN ( MIN ) =
V LED + V D
DC MAX
+ V CESAT ? V D
through the LEDs.
When the switch is on, a voltage proportional to the switch
current is added to a stabilizing ramp and the resulting
sum is fed into the positive terminal of the PWM compara-
tor. When this voltage exceeds the level at the negative
input of the PWM comparator, the PWM logic turns off
the power switch. The level at the negative input of the
PWM comparator is set by the error ampli?er output. This
voltage is set by the LED current and the bandgap refer-
ence. In this manner, the error ampli?er sets the correct
peak current level in the inductor to keep the LED output
current in regulation. The external R SET resistor is used
to program the LED current from 10mA to 50mA.
Input Voltage Range
The minimum input voltage required to generate a speci?c
output voltage in an LT3595A application is limited by its
where DC MAX is the minimum rating of maximum duty
cycle.
The maximum input voltage is limited by the absolute
maximum rating of 45V.
Pulse-Skipping
At low duty cycles, the LT3595A may enter pulse-skipping
mode. Low duty cycle occurs at higher input voltages and
lower LED count. The LT3595A can drive currents with-
out pulse-skipping provided the voltage across the LED
string is greater than 15% of the input supply voltage. If
the current decreases to the point that the LED voltage is
less than 15% of the input supply, the device may begin
skipping pulses. This will result in some low frequency
ripple, although the LED current remains regulated on an
average basis down to 10mA.
3595af
8
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
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
LT3746IUHH#TRPBF IC LED DRIVER 32CHANNEL 56-QFN
相关代理商/技术参数
LT3595AEUHHPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:16 Channel Buck Mode LED Driver
LT3595AEUHHTRPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:16 Channel Buck Mode LED Driver
LT3595EUHH#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
LT3595EUHH#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
LT3595EUHH-PBF 制造商:LINER 制造商全称:Linear Technology 功能描述:16 Channel Buck Mode LED Driver
LT3595EUHH-TRPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:16 Channel Buck Mode LED Driver
LT3596 制造商:LINER 制造商全称:Linear Technology 功能描述:60V Triple Step-Down LED Driver Programmable Temperature Protection
LT3596EUHG#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:- 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