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參數(shù)資料
| 型號(hào)： | CAT4004 |
| 英文描述： | 4-Channel Constant Current LED Driver with EZDi TM |
| 中文描述： | 4通道恒定電流LED驅(qū)動(dòng)EZDi商標(biāo) |
| 文件頁(yè)數(shù)： | 3/11頁(yè) |
| 文件大?。?/td> | 276K |
| 代理商： | CAT4004 |
CAT4004
2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. 5024 Rev. A
SET
R
V
6
132
×
RECOMMENDED EN/DIM TIMING
For 2.4
≤
V
IN
≤
5.5V, over full ambient temperature range -40oC to +85oC.
Symbol
T
SETUP
T
LO
T
HI
T
PWRDWN
T
LED
Name
EN/DIM setup from shutdown
EN/DIM program low time
EN/DIM program high time
EN/DIM low time to shutdown
LED current settling time
Conditions
Min
10
0.2
0.2
1.5
Typ
40
Max
100
Units
μ
s
μ
s
μ
s
ms
μ
s
Figure 1. EN/DIM Dimming Timing Diagram
EN/DIM
number of pulses *
LOW
Transitions HIGH
1
st
2
nd
3
rd
4
th
5
th
6
th
x
th
R
SET
Gain
LED Current
Shutdown mode
132
66
33
16.5
8.25
4.125
132
Zero
132 x 0.6V/R
SET
66 x 0.6V/R
SET
33 x 0.6V/R
SET
16.5 x 0.6V/R
SET
8.25 x 0.6V/R
SET
4.125 x 0.6V/R
SET
132 x 0.6V/R
SET
GAIN x 0.6V/R
SET
Device will keep cycling through gain selection
* The gain is changed on the rising edges of the EN/DIM input.
LED CURRENT SELECTION
At power-up, the initial LED current is set to full scale
(100% brightness) by the external resistor RSET as
follows:
LED current =
The EN/DIM pin has two primary functions. One
function enables and disables the device. The other
function is LED current dimming with six different
levels by pulsing the input signal, as shown on Figure 3.
On each consecutive pulse rising edge, the LED current
is divided by half to 50%, then 25%, 12.5%, 6.25% and
3.125% dimming levels. Pulses faster than the mini-
mum T
LO
may be ignored and filtered by the device.
Pulses longer than the maximum T
LO
may shutdown the
device.
The LED driver enters a “zero current” shutdown mode
if EN/DIM is held low for 1.5ms or more.
EN/DIM
LED
Current
Shutdown
T
SETUP
T
HI
T
PWRDWN
Shutdown
T
LO
T
LED
100%
50%
25%
12.5%6.25%
3.12%
100%
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT4004_08 | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:4-Channel Constant Current LED Driver with EZDim⑩ |
| CAT4004A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Constant Current LED Driver with 32 Dimming Levels and Rset |
| CAT4004AHU2-GT3 | 功能描述:LED照明驅(qū)動(dòng)器 LED DR 4 CH EZ DIM I/F RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT4004AHU2-GT3B | 功能描述:LED照明驅(qū)動(dòng)器 322.4V to 5.5V RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| CAT4004BHU2-GT3 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Constant Current Programmable LED Driver with 32 Dimming Levels |
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