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参数资料
| 型号： | A8502KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 18/35页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE MULTI 16-TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 2 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 580kHz ~ 2MHz |
| 电源电压： | 5 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
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A8502
Analog dimming
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
The advantage of this circuit is that the DAC voltage can be
The A8502 can also be dimmed by using an external DAC or
another voltage source applied either directly to the ground side
of the R ISET resistor or through an external resistor to the ISET
pin (see figure 19). The limit of this type of dimming depends on
the range of the ISET pin. In the case of the A8502 the limit is
40 to 125 μ A.
? For a single resistor (panel A of figure 18), the ISET current is
higher or lower, thus adjusting the LED current to a higher or
lower value of the preset LED current set by the R ISET resistor:
? V DAC = 1.003 V; the output is strictly controlled by R ISET
? V DAC > 1.003 V; the LED current is reduced
? V DAC < 1.003 V; the LED current is increased
LED short detect
I SET =
controlled by the following formula:
V ISET – V DAC
R ISET
(3)
Both LEDx pins are capable of handling the maximum V OUT
that the converter can deliver, thus providing protection from the
LEDx pin to V OUT in the event of a connector short.
where V ISET is the ISET pin voltage and V DAC is the DAC output
voltage.
When the DAC voltage is 0 V the LED current will be at its
maximum. To keep the internal gain amplifier stable, the user
should not decrease the current through the R ISET resistor to less
than 40 μ A
? For a dual-resistor configuration (panel B of figure 19), the I SET
current is controlled by the following formula:
An LEDx pin that has a voltage exceeding V LEDSC will be
removed from operation (see figure 20). This is to prevent the IC
from dissipating too much power by having a large voltage pres-
ent on an LEDx pin.
While the IC is being PWM-dimmed, the IC rechecks the dis-
abled LED every time the PWM signal goes high, to prevent false
tripping of an LED short event. This also allows some self-cor-
rection if an intermittent LED pin short to V OUT is present.
I SET =
V ISET
R ISET
–
V DAC – V ISET
R 1
(4)
Overvoltage protection
The A8502 has overvoltage protection (OVP) and open Schottky
diode (D1 in figure 1) protection. The OVP protection has a
DAC
R ISET
A8502
VDAC
GND
ISET
GND
C1
I OUT
(A)
LED1
DAC
R1
A8502
VDAC
ISET
C2
GND
R ISET
(B)
GND
C3
PWM/EN
t
Figure 19. Simplified diagrams of voltage control of I LED : typical
applications using a DAC to control I LED using a single resistor (upper),
and dual resistors (lower).
Figure 20. Example of the disabling of an LED string when the LED pin
voltage is increased above 4.6 V; shows I OUT (ch1, 200 mA/div.), LED1
(ch2, 5 V/div.), and PWM/EN (ch3, 5 V/div.), time = 10 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
18
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| A8503 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:High Efficiency 6-Channel, 2 MHz, WLED/RGB Driver |
| A8503EECTR-T | 功能描述:IC LED DRVR WHT/RGB BCKLGT 26QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 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:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
| A8503GECTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 26QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 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:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| A8504 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:WLED/RGB Backlight Driver for Medium Size LCDs |
| A8504910100N | 功能描述:环形MIL规格后盖 Backshell, Envrn, EMI/RFI, Strt, Nickel, Size 48 RoHS:否 制造商:Amphenol PCD MIL 类型:MIL-DTL-38999 III, IV 系列:AS85049 产品类型:Environmental EMI/RFI Backshells 外壳类型:Straight 外壳大小:18 外壳材质:Aluminum Alloy |
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