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参数资料
| 型号： | CAT4004VP2-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 3/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 4CH EZ DIM I/F 8TDFN |
| 标准包装： | 3,000 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO） |
| 输出数： | 4 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光 |
| 电源电压： | 2.4 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN（2x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
CAT4004
Table 4. RECOMMENDED EN/DIM TIMING
(For 2.4 ≤ V IN ≤ 5.5 V, over full ambient temperature range ? 4 0 ° C to +85 ° C.)
Symbol
Name
Conditions
Min
Typ
Max
Units
T SETUP
EN/DIM setup from shutdown
10
m s
T LO
T HI
T PWRDWN
T LED
EN/DIM program low time
EN/DIM program high time
EN/DIM low time to shutdown
LED current settling time
T SETUP
T HI
0.2
0.2
1.5
40
T PWRDWN
100
m s
m s
ms
m s
EN/DIM
T LED
100%
T LO
100%
LED
Current
Shutdown
50%
25%
12.5% 6.25%
3.12%
Shutdown
Figure 2. EN/DIM Dimming Timing Diagram
EN/DIM
Number of Pulses (Note 3)
LOW
Transitions HIGH
1 st
2 nd
3 rd
4 th
5 th
6 th
x th
R SET Gain
Shutdown mode
132
66
33
16.5
8.25
4.125
132
Device will keep cycling through gain selection
LED Current
Zero
132 x 0.6 V/R SET
66 x 0.6 V/R SET
33 x 0.6 V/R SET
16.5 x 0.6 V/R SET
8.25 x 0.6 V/R SET
4.125 x 0.6 V/R SET
132 x 0.6 V/R SET
GAIN x 0.6 V/R SET
3. The gain is changed on the rising edges of the EN/DIM input.
LED Current Selection
LED current + 132
At power ? up, the initial LED current is set to full scale
(100% brightness) by the external resistor RSET as follows:
0.6 V
R SET
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 2. 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 minimum 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 1.5 ms or more.
http://onsemi.com
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