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| 型号： | CAT4008W-T2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER LINEAR 16-SOIC |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 频率： | 25MHz |
| 电源电压： | 3 V ~ 5.5 V |
| 输出电压： | 0.4 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 805 (CN2011-ZH PDF) |
| 其它名称： | CAT4008W-T2DKR |
CAT4008
Block Diagram
LED1 LED2 LED3
LED8
VIN
VDD
CURRENT
SINKS
+
Current
Setting
RSET
BLANK
1.2 V Ref
GND
LATCH
L1
L2
L3
LATCHES
L8
SIN
S1
S2
S3
SHIFT
REGISTER
S8
SOUT
CLK
Figure 17. CAT4008 Functional Block Diagram
Basic Operation
LED current ^ 51
The CAT4008 uses 8 tightly matched current sinks to
accurately regulate the LED current in each channel. The
external resistor, R SET , is used to set the LED channel
current to about 51 times the current in R SET .
1.2
R SET
Tight current regulation for all channels is possible over
a wide range of input and LED voltages due to independent
current sensing circuitry on each channel. The LED
channels have a maximum dropout of 0.4 V for most current
and supply voltage conditions. This helps improve the heat
dissipation and efficiency of the LED driver.
Upon power ? up, an under ? voltage lockout circuit clears
all latches and shift registers and sets all outputs to off. Once
the under ? voltage lockout threshold has been reached the
device can be programmed.
The driver delays the activation of each consecutive LED
output channel by 17 ns (typical). Relative to LED1, LED2
is delayed by 17 ns, LED3 by 34 ns and LED8 by 120 ns
typical. The delay is introduced when LATCH is activated.
The delay minimizes the inrush current on the LED supply
by staggering the turn on and off current spikes over a period
of time and therefore allowing usage of smaller bypass
capacitors.
Pull ? up and pull ? down resistors are internally provided to
set the state of the BLANK and LATCH pins to the off ? state
when not externally driven.
Serial Interface
A high ? speed serial 4 ? wire interface is provided to
program the state of each LED on or off. The interface
contains an 8 ? bit serial to parallel shift register (S1 ? S8) and
an 8 ? bit latch (L1 ? L8). Programming the serial to parallel
register is accomplished via SIN and CLK input pins. On
each rising edge of the CLK signal, the data from SIN is
moved through the shift register serially. Data is also moved
out of SOUT which can be connected to a next device if
programming more than one device on the same interface.
On the rising edge of LATCH, the data contents of the
serial to parallel shift register is reflected in the latches. On
the falling edge of LATCH, the state of the serial to parallel
register at that particular time is saved in the latches and does
not change irrespective of the contents of the serial to
parallel register.
BLANK is used to disable all LEDs (turn off)
simultaneously while maintaining the same data in the latch
register. When low, the LED outputs reflect the data in the
latches. When high, all outputs are high impedance (zero
current).
http://onsemi.com
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相关代理商/技术参数 |
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|---|---|
| CAT4008Y | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT4008Y-GT2 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:8-Channel Constant Current LED Driver |
| CAT4008Y-T2 | 功能描述:LED照明驱动器 LED Driver 8 Chan 4-wire I/F 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 |
| CAT4016 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:16-Channel Constant Current LED Driver |
| CAT4016_08 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:16-Channel Constant Current LED Driver |
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