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| 型号： | MC34848EP |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 16/38页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR BACKLIGHT 8CH 48QFN |
| 产品变化通告： | AMPD Product Discontinuation 12/Dec/2012 |
| 标准包装： | 260 |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 频率： | 200kHz ~ 1.2MHz |
| 电源电压： | 2.6 V ~ 3.6 V |
| 输出电压： | 45V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN-EP（7x7） |
| 包装： | 托盘 |
| 工作温度： | -40°C ~ 85°C |
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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
INTERNAL POWER SUPPLY
The internal circuitry of the 34848 uses two separate
power supplies. The first is a high voltage input at PVCC that
can range from 6.0 to 14 V, and is used to power the LED
drivers and gate drive for the boost controller. The external
Boost low side FET gate drive is equal to the input voltage at
VDC. The second supply is DVDD, which ranges from 2.6 to
3.6 V, and is used to power the internal logic circuits.
Internally there are two regulators, which both have
external decoupling capacitors. VDC is used to regulate the
PVCC input to produce a constant drive voltage for the
internal LED drivers, and is decoupled on the VDC pin.
VLOGIC is used to produce 2.5 V for internal logic from the
DVDD supply and is decoupled using a capacitor on the
VLOGIC pin.
If the input voltage at either supply falls below their
respective UVLO threshold, the device automatically enters
the power down mode. Likewise, operation of the device is
only possible when the two input voltages are above the
UVLO threshold levels.
In addition to the above, PVCC voltage is also monitored
for UVLO.
The SHUT_B pin can be used to enable/disable the Boost
Controller and LED drivers.
DIFFERENTIAL INTERFACE AND CONTROL
LOGIC
The 34848 uses a differential interface. The clock rate
supported is up to 85 MHz. In addition, 6 logic pins are also
used as part of the interface.
Figure 12. Control Interface
When SETUP is taken high the interface programs data
registers which are in setting mode. An integrated 10-bit shift
register selects which bit is being written. After the pulsing
data in from the differential interface. An internal counter
(SIC) selects which channel is being written. The 10-bit shift
register in multiple devices are connected to generate a long
from SETUP and RESET_SCAN, the STH triggers the PWM
34848
Analog Integrated Circuit Device Data
16
Freescale Semiconductor
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34848EPR2 | 功能描述:LED照明驱动器 8 CHANNEL LED 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 |
| MC34849 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 16WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 16POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Vertical; No. of Contacts:16; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
| MC34851 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 18WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 18WAY |
| MC34853 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 16WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 16WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 16POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Right Angle; No. of Contacts:16; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
| MC34855 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 18WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 18WAY |
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