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参数资料
| 型号： | A8504EECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHT/RGB BCKLGT 26QFN |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 200kHz ~ 2MHz |
| 电源电压： | 4.2 V ~ 5.5 V |
| 输出电压： | 47V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 26-WFQFN 裸露焊盘 |
| 供应商设备封装： | 26-QFN/MLP-EP（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1215-6 |
A8504
WLED/RGB Backlight Driver for Medium Size LCDs
Open LED Protection. The A8504 has protection against open
LEDs. If any enabled LED string opens, voltage on the corre-
sponding LED x pin goes to zero. The boost loop operates in open
V IN
SW SW
D1
V OUT
loop till the OVP level is reached. The A8504 identifies the open
LED string when overvoltage on the OVP pin is detected. This
ROVP
OVP
DZ
COUT
string is then removed from the boost controlling loop. The boost
circuit is then controlled in the normal manner, and the output
voltage is regulated, to provide the output required to drive the
remaining strings. If the open LED string is reconnected, it will
OVP
Disable
28.8 V
–
+
1.23 V
22 k Ω
A
sink current up to the programmed current level.
Note: Open strings are removed from boost regulation, but not
disabled. This keeps the string in operation if LEDs open for only
a short length of time, or reach OVP level on a transient event.
The disconnected string can be restored to normal mode by re-
enabling the IC. It can also be restored to normal operation if the
4.4 k Ω
Figure 5. Overvoltage protection circuit. Three alternative
configurations at (A) are available, as follows:
fault signal is removed from the corresponding LED x pin, but an
OVP event occurs on any other LED x pin.
External Component
ROVP only
DZ only
both ROVP and DZ
OVP Rating
up to 45 V
up to 47 V
redundancy
C1
V PWM
C1
V PWM
Startup
V PWM
I IN
LED opens
I IN
C2
Overvoltage condition
detected
V OUT
C2
Normal
operation
Overvoltage condition
detected
V OUT
C4
Normal operation
established
I OUT
V OUT
I OUT
Normal operation restored
with open LED string
removed from control loop
I OUT
C3
t
C4
C3
t
Symbol
C1
C2
C3
C4
t
Parameter
V PWM
I IN
v out
I out
time
Units/Division
5.00 V
500 mA
5.00 V
200 mA
200 μ s
Symbol
C1
C2
C3
C4
t
Parameter
V PWM
I IN
v out
I out
time
Units/Division
5.00 V
500 mA
5.00 V
100 mA
200 μ s
Figure 4. Timing of overvoltage protection (OVP) function when open
LEDs are detected at startup (left ) and during normal operation (right).
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1 . 508.853.5000; www.allegromicro.com
10
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| A8508 | 制造商:ROCKWE 功能描述: |
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