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| 型号： | ZXLD1100H6TA |
| 厂商： | Diodes Inc |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT SC-70-6 |
| 产品变化通告： | End of Life 16/Sept/2011 |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 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： | 1MHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 输出电压： | 28V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP，SC-88，SOT-363 |
| 供应商设备封装： | SC-70-6 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXLD1100H6DKR |
LAST TIME BUY
Closest Alternative is AP5724FDCG-7
ZXLD1100
APPLICATIONS
Programming the maximum LED current
The maximum LED current is programmed by adding a
single resistor in series with the LED chain. The current
is determined by the resistor value and feedback
voltage and is given by:
I LED = V FB /R1
where V FB =100mV
The table below gives recommended resistor values
for required LED currents:
Dimming Control using a DC voltage
For applications where the EN pin is not available a DC
voltage can be used to control dimming. By adding
resistors R2 and R3 and applying a DC voltage, the LED
current can be adjusted from 100% to 0%. As the DC
voltage increases, the voltage drop across R2 increases
and the voltage drop across R1 decreases, thus
reducing the current through the LEDs. Selection of R2
and R3 should ensure that the current from the DC
voltage is much less than the LED current and much
larger than the feedback current. The component
values in the diagram below represent 0% to 100%
dimming control from a 0 to 2V DC voltage.
LED Current
10mA
15mA
20mA
30mA
R1 Value
10
6.8
5
3.3
Dimming Control via a PWM signal on the EN pin
A Pulse Width Modulated (PWM) signal can be applied
to the EN pin in order to adjust the output current to a
value below the maximum LED current. Two modes of
adjustment are possible as described below.
True Analog Dimming - Filtered ‘DC’ mode
If a PWM signal of 10kHz or higher is applied to the EN
pin, the device will remain active when the EN pin is
low. However, the input to the internal low pass filter
will be switched alternately from V REF to ground, with a
duty cycle (D) corresponding to that of the PWM signal.
This will present a filtered dc voltage equal to the duty
cycle multiplied by V REF to the control loop and will
produce a dc output current lower than the maximum
set value. This current is given by:
I OUTdc = 0.1D/R1
This mode of adjustment minimizes flicker in the light
output and system noise.
Pulsed Dimming - Gated Mode
If a lower frequency of 1kHz or less is applied to the EN
pin, the device will be gated ‘on’ and ‘off’ at a duty cycle
(D) corresponding to that of the input signal. The
average output current is then given by:
Dimming Control using a logic signal
For applications where the LED current needs to be
adjusted in discrete steps a logic signal can be applied
as shown in the diagram below. When Q1 os ‘off’, R1
sets the minimum LED current. When Q1 is ‘on’, R2 sets
the LED current that will be added to the minimum LED
current. The formula for selecting values for R1 and R2
are given below:
I OUTavg ? 0.1D/R1
This mode may be preferred over dc current control if
the purest white output is required. However, note the
120 s nominal turn-off delay of the device, when using
MOSFET ‘off’
I LED ( MIN )
MOSFET ‘on’
V FB
R LED
the device in this mode.
I LED ( MAX )
V FB
R LED
I LED ( MIN )
where V FB = 100mV
ISSUE 4 - JULY 2004
SEMICONDUCTORS
8
相关PDF资料 |
PDF描述 |
|---|---|
| ZXLD1101ET5TA | IC LED DRVR WHITE BCKLGT SOT23-5 |
| ZXLD1320DCATC | IC LED DRVR WHITE BCKLGT 14-TDFN |
| ZXLD1321DCATC | IC LED DRVR WHITE BCKLGT 14-TDFN |
| ZXLD1322DCCTC | IC LED DRIVR WHITE BCKLGT 14-DFN |
| ZXLD1350ET5TA | IC LED DRIVR WHITE BCKLGT TSOT-5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZXLD1100H6TC | 制造商:ZETEX 制造商全称:ZETEX 功能描述:ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH AND OPEN CIRCUIT PROTECTION IN SC70-6 |
| ZXLD1101 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH IN TSOT23-5 |
| ZXLD1101ET5 | 制造商:Diodes Incorporated 功能描述:LED DRIVER ADJUSTABLE SMD 1101 制造商:Diodes Incorporated 功能描述:LED DRIVER ADJUSTABLE, SMD, 1101 |
| ZXLD1101ET5 | 制造商:Diodes Incorporated 功能描述:LED DRIVER ADJUSTABLE SMD 1101 |
| ZXLD1101ET5TA | 功能描述:LED照明驱动器 Series/Parallel RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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