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| 型号： | MC34848EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 21/38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： | 2,000 |
| 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： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
PROTECTION FUNCTIONS
The 34848 monitors the backlighting application from
several fault conditions to protect itself and the LED strings.
See Protection and Diagnostic Features for a detailed
description.
BOOST CONTROLLER
The integrated boost controller operates in non-
synchronous mode and uses an external boost low side FET.
Current is sensed across the sense resistor between the low
side FET and ground, and is used for over-current protection
(OCP) and current sensing for current mode control.
8 CHANNEL LED CURRENT DRIVER
The programmable current driver matches the current in
up to 8 LED strings to within ±1%. The current can be
programmed independently for scan and local dimming
modes. In scan mode, the current can be programmed from
121.25 to 160 mA in 32 steps. In local dimming mode, the
current range is from 62.5 to 80 mA in 8 steps. To provide this
high matching ratio between ICs, the voltage references used
in the ICs are connected between each chip using the REFIO
and GNDIO pins.
The current driver circuits are also used to disable current
flow in the LEDs when the LEDs are in the Off state, or when
PWM is off. This enhances the performance of the PWM
dimming function by maintaining a constant current through
the LEDs when illuminated.
34848
Analog Integrated Circuit Device Data
Freescale Semiconductor
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MC34857 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL SMT 2WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, SMT, 2WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 2POS, 3MM; Series:2261(5561)R; Pitch Spacing:3mm; Contact Termination:Surface Mount Vertical; No. of Contacts:2; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
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