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参数资料
| 型号： | MSL3082CS |
| 厂商： | Atmel |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER 8 STRING |
| 产品培训模块： | Industrial Panel Backlighting Driver ICs LED Lighting Drivers LED Driver Basics |
| 标准包装： | 2,500 |
| 系列： | Adaptive SourcePower™ |
| 拓扑： | 交直流离线开关，PWM |
| 输出数： | 8 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光，通用 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 18MHz ~ 22MHz |
| 电源电压： | 10.8 V ~ 13.2 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-VFQFN 裸露焊盘 |
| 供应商设备封装： | 44-QFN（7x7） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 105°C |
Atmel LED Driver-MSL3082
8-string, High-power, White or RGB LED Driver for TV,
Blacklighting, or Intelligent Solid-state Lighting
The device interfaces to an MCU via the I 2 C/SMBus
interface. The robust 1MHz I 2 C/SMBus interface
supports up to sixteen devices on the bus, and is fast
enough to support area dimming for 16 interconnected
devices. While typically the LED drive PWM signal is
internally generated by the PWM engine, the device
also accepts an external direct PWM drive signal
applied to the PWM input to set the frequency and
duty cycle of the LED drive signals. When using the
PWM engine, the MSL3082 allows phase spreading of
the LED drive signals, which helps reduce the transient
load on the LED power supply. Phase spreading is not
supported for direct PWM drive.
The PWM frequency of the drivers is easily synchronized
to an external video signal applied to PHI. Typically, the
VSYNC signal from the video system is used as the PHI
input. A frame-rate multiplier (1x to 16x) processes
this signal for use by the PWM engine. The on-time of
each string is individually programmed via the device
registers, providing a peak resolution of 10 bits when
using the on-chip PWM generator. The actual resolution
of the PWM frequency depends on the ratio of the
GSC frequency (typically provided by a systems
HSYNC signal) to the PHI frequency because the on
time of a string is programmed as a function (8-bit
count) of the number of GSC cycles. This count can be
further scaled by a 6-bit global intensity register, when
enabled. The GSC clock is also used to precisely set
MSL3082 automatically reduces the power supply
voltage to the minimum voltage required to keep the
LEDs in current regulation. The devices are configured
to periodically perform this optimization to compensate
for changes in LED forward voltage, and to assure
continued optimum power savings.
Internal Regulators and Enable Input
The MSL3082 includes an internal linear regulator
powered from VIN that provides 2.5V, VDD, to power
the internal circuitry. Bypass VDD to GND with a 10μF
or greater capacitor.
The enable input, EN, turns the VDD regulator on and off.
To turn on the MSL3082 force EN high with a 5V logic
level, and force EN low to turn it off. When EN is low,
the MSL3082 enters low-power mode, and the serial
interface is ignored. Toggling EN low also clears all fault
registers and releases FLTB. Faults re-establish if the
conditions that generated them persist.
Setting LED String Currents
The maximum string current, I LED , for each string is set
by a resistor, R Sn , connected to ground from the source
terminal of the external string drive MOSFET. The
feedback threshold is 500mV. Determine the resistor
value using:
R Sn =
each string’s phase delay to be synchronized with its
physical position relative to the video frame. Additionally,
the MSL3082 features programmable temperature
compensation, which throttles back the PWM on time of
all strings when the temperature of the LEDs exceeds a
programmable threshold.
0 . 5
ohms. I LED
, where I LED is in amperes and R Sn is in
The Efficiency Optimizers control a wide range of
different external DC-DC and AC-DC converter
architectures. Multiple drivers in a system communicate
in real time among themselves to select an optimized
operating voltage for the LEDs. This allows design of the
power supply for the worst case forward voltage (V f )
of the LEDs without concern about excessive power
dissipation issues. During the start-up sequence, the
Atmel LED Driver-MSL3082
For example, a full-scale LED current of 500mA
returns R Sn = 1.00 Ω . The current for the LED strings is
individually reduced from the full-scale resistor set value
with 6-bit resolution using ISTR n , the string current
control registers 0x10 through 0x1F.
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MSL3082CS-R | 功能描述:LED照明驱动器 8Str Hi Pwr White or RGB LED Drivers 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 |
| MSL3085 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-string White and RGB LED Driver with Adaptive Power Control, EEPROM, and I2C/SMBus Serial Interface |
| MSL3085BT | 功能描述:LED照明驱动器 8-Stinge White & RGB LED Dvrs wAdapt Pwr 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 |
| MSL3085BT-R | 功能描述:LED照明驱动器 8-String White & RGB LED Drivers with Ad 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 |
| MSL3086-IU | 功能描述:LED照明驱动器 8-Str LED Driver Internal Boost Cntr 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 |
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