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| 型号： | MC34844EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 44/62页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR BACKLIGHT 10CH 32QFN |
| 视频文件： | LED backlighting with MC34844 |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 10 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 频率： | 可调节/可选择 |
| 电源电压： | 7 V ~ 28 V |
| 输出电压： | 8 V ~ 60 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 105°C |
| 配用： | KIT34844EPEVME-ND - BOARD EVAL 10CH MC34844 LED DVR |
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MC34844A
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
MC34844 - Functional Block Diagram
Regulators / Power Down
3 Internal Regulators
Protection / Failure Detection
Over-temperature Protection
Over-current Protection
Under-voltage Protection
Over-voltage Protection
LED Open Protection
Logic Control
Optical and Temperature Control
PWM Dimming
Serial Interface Control
Boost
LED Channels
Regulator / Power down
Protection / Failure Detection
Logic Control
LED Channels
Boost
Figure 25. Functional Internal Block Diagram
REGULATORS
The 34844A is designed to operate from input voltages in
the 7.0 to 28 V range. This is stepped down internally by
LDOs to 2.5 V (VDC1 and VDC3) and 6 V (VDC3) for
powering internal circuitry. If the input voltage falls below the
UVLO threshold, the device automatically enters in shut
down mode.
Power UP Sequence:
The power up sequence for applying V IN , with respect to
the ENABLE and PWM signals, is very important to assure a
good performance of the part.
It is recommended to follow this sequence:
1. Apply V IN first
2. Wait for a couple of milliseconds (~2.0 ms) to let the
logic and internal regulators get settled
3. Take the EN pin high, or keep it low depending on the
operating mode
4. Apply the PWM signal
Operating Modes:
The device can be operated by the EN pin and/or SDA/
SCK bus lines, resulting in three distinct operation modes:
? Manual mode, there is no I 2 C capability, the bus line pins
must be tied low, and the EN pin controls the ON/OFF
operation. To shutdown the part in Manual mode, first the
PWM pin should be taken low followed by the EN pin. The
part will not shut down unless V OUT collapses to a voltage
below 30 V.
? SM Bus mode, EN pin must be tied low and the device is
turned ON by any activity on the bus lines. The part shuts
down if the bus lines are held low for more than 30 ms, the
30 ms watchdog timer can be disabled by I 2 C (setting
SETI2C bit high) or tying the EN pin high. In Sleep mode
(EN bit=0) the device reduces the power consumption by
leaving “alive” only the blocks required for I 2 C
communication.To shutdown the part in SM Bus mode, the
EN bit should first be a '0', then the SCK and SDA should
be taken low.
? I 2 C mode, has to be configured by I 2 C communication
(SETI2C bit = 1) right after the IC is turned ON, it prevents
the part from being turned ON/OFF by the bus. Sleep
mode is also present and it is intended to save power, but
still keep the IC prepared to communicate by I 2 C. By
taking the EN bit low and then the EN pin low, the part
enters into a shutdown mode.
34844A
Analog Integrated Circuit Device Data
44
Freescale Semiconductor
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34845 | 制造商:SPC Multicomp 功能描述:RECEPTACLE FREE 16WAY 制造商:SPC Multicomp 功能描述:RECEPTACLE, FREE, 16WAY |
| MC34845AEP | 功能描述:LED照明驱动器 6-Ch LED Backlt Driver 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 |
| MC34845AEPR2 | 功能描述:LED照明驱动器 6-Ch LED Backlt Driver 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 |
| MC34845BEP | 功能描述:USB 接口集成电路 6-Ch LED Backlt Driver RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| MC34845BEPR2 | 功能描述:USB 接口集成电路 6-Ch LED Backlt Driver RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
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