- 您现在的位置：买卖IC网 > Datasheet目录344 > MSL3085BT (Atmel)IC LED DRIVER 8 STRING Datasheet资料下载
参数资料
| 型号： | MSL3085BT |
| 厂商： | Atmel |
| 文件页数： | 12/20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： | 19.4MHz ~ 20.6MHz |
| 电源电压： | 10.8 V ~ 13.2 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN（6x6） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 105°C |
Detailed Description
The MSL3085 is a highly integrated, flexible, multi-string
LED driver that uses external MOSFETs to allow high
LED string currents, and includes power supply control
to maximize efficiency. The driver optionally connects
to a video subsystem to offer a simple architecture for
use in LCD TV backlight applications. Up to eight devices
easily connect together to drive a large number of
LED strings in a system. The drivers provide multiple
methods of controlling LED brightness through both
peak current control and pulse width control of the
string drive signals. Peak current control offers excellent
color consistency, while pulse width control allows
brightness management. An on-chip EEPROM holds
all the default control register values. At power-up,
the data in the EEPROM is automatically copied
directly to the control registers, setting up the device
for operation. The factory programmed EEPROM
values are changeable through the serial interface if a
different power-up condition is desired.
The device interfaces to an MCU via the I 2 C interface.
The robust, 1MHz I 2 C interface supports up to eight
devices on the bus. While typically the LED drive PWM
signal is internally generated, the device also accepts
an external direct PWM drive signal applied to the
PWM input that sets the PWM duty cycle and the
frequency of the LED drive signals. The MSL3085 also
allows phase spreading of the LED drive signals, which
helps reduce both the transient load on the LED power
supplies and the power supply input capacitor size
requirements.
The MSL3085 is an eight string version of the
MSL2161, squeezed into a smaller package, with
two efficiency optimizer (EO) outputs and one EO
input. (The MSL2161 offers 16 string drives, three EO
outputs, and three EO inputs.) This offers the advantage
of small size, but to ensure register compatibility with
the MSL2161, pin names of the FET drive outputs are
not sequential. The FET drive outputs are named 0, 2,
4, 6, 9, 11, 12, and 14 (not 0 through 7). All control
registers also follow this naming convention. Additionally,
this has a small impact on the automatic phase-shift
feature, whose sequential phase shifts for outputs 9
and 12 are spaced at 1/16 th the PWM frame, while the
others are spaced at 1/8 th the PWM frame.
The PWM frequency of the drivers is easily
synchronized to an external video signal applied to PHI,
12
synchronized to the internal oscillator for standalone
applications, or set directly by a signal at the PWM input.
Typically, the VSYNC signal from the video system is
used as the PHI input. A frequency multiplier (1x to
32x) 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 12 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 system’s HSYNC signal, but can be internally
generated) to the PHI frequency because the on time of
a string is programmed as a 12-bit count of the number
of GSC clock cycles. This count can be further scaled by
an 8-bit global intensity register, when enabled. The
GSC clock is also used to precisely set each string’s
phase delay so that it is synchronized to its physical
position relative to the video frame.
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
MSL3085 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 MSL3085 includes two internal linear regulators
that provide VCC (5V) and VDD (2.5V) for internal
circuitry. VIN (12V nominal) supplies the VCC and VDD
regulators. Bypass VIN to GND with a 10μF capacitor
close to the device. Bypass VCC to GND with a 4.7μF
capacitor close to the device. Bypass VDD to GND with a
4.7μF capacitor close to the device.
Atmel LED Driver-MSL3085
相关PDF资料 |
PDF描述 |
|---|---|
| MSL3162BT | IC LED DRIVER 16 STRING |
| MSL3164BT | IC LED DRIVER 16 STRING |
| MSL3167GU | IC LED DRIVER 16 STRING |
| MT-6 PLUS | SURGE SUPPR TCHMSTR 6OUT 10'CORD |
| MT42L256M32D4KP-3 IT:A | IC LPDDR2 SDRAM 8GBIT 168FBGA |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MSL3086-IUR | 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 |
| MSL3088-IU | 功能描述:LED照明驱动器 8-Str LED Driver Intrnl Bst Cntr/Phas 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 |
| MSL3088-IUR | 功能描述:LED照明驱动器 8-Str LED Driver Intrnl Bst Cntr/Phas 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 |
发布紧急采购，3分钟左右您将得到回复。