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Freescale Semiconductor
Advance Information
Low Cost 6 Channel LED
Backlight Driver with Integrated
Power Supply
The 34845 series represents high efficiency LED drivers for use in
backlighting LCD displays from 10” to 17” +. Operating from supplies of
5.0 to 21V, the 34845 series is capable of driving up to 16 LEDs in series
in 6 separate strings. The LED current tolerance in the 6 strings is within
±2% maximum and is set using a resistor to GND.
Document Number: MC34845
Rev. 6.0, 12/2011
34845
34845A/B/C/D
LED DRIVER
98ASA00087D
24-PIN QFN-EP
ORDERING INFORMATION
PWM dimming is performed by applying a PWM input signal to the
PWM pin which modulates the LED channels directly. An Enable Pin
(EN) provides for low power standby. Alternatively, a single wire
scheme selects power down when PWM is connected to the Wake Pin
and held low.
The integrated boost converter uses dynamic headroom control to
Device
MC34845EP/R2
MC34845AEP/R2
MC34845BEP/R2
Temperature
Range (T A )
-40° to 85°C
Package
24 QFN-EP
automatically set the output voltage. There are three device versions for
boost frequency; 34845/C is 600 kHz, 34845A is 1.2 MHz and the
34845B/D is 300 kHz. External compensation allows the use of different
inductor/ capacitor combinations.
MC34845CEP/R2
MC34845DEP/R2
Typical Applications
The 34845 includes fault protection modes for LED short and open,
over temperature, over current and over voltage errors. It features an
internally fixed OVP value of 60V (typical) which protects the device in
the event of a failure in the externally programmed OVP. The OVP level
can be set by using an external resistor divider.
Features
? Input voltage of 5.0 to 21V
? Boost output voltage up to 60V
? 2.0 A integrated boost FET
? Fixed boost frequency - 300 kHz, 600 kHz or 1.2 MHz
? OTP, OCP, UVLO fault detection
? LED short/open protection
? Programmable LED current between 3.0 mA and 30 mA
? 24-Ld 4x4x0.65mm μ QFN Package
34845
?
?
?
?
?
?
?
PC Notebooks
Netbooks
Picture Frames
Portable DVD Players
Small Screen Televisions
Industrial Displays
Medical Displays
12V
VIN
VDC1
SWA
SWB
VDC2
VOUT
PGNDB
COMP
PGNDA
EN
OVP
5V
~
~
~
~
~
~
CONTROL
UNIT
PWM
WAKE
ISET
FAIL
CH1
CH2
CH3
CH4
CH5
CH6
GND
EP
GND
Figure 1. 34845 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
? Freescale Semiconductor, Inc., 2011. All rights reserved.
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相关代理商/技术参数
MC34845CEP 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
MC34845CEPR2 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
MC34845DEP 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
MC34845DEPR2 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
MC34845EP 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
MC34845EPR2 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
MC34846EP 功能描述:LED照明驱动器 6-Ch LED Backlt Drvr 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
MC34846EPR2 功能描述:LED照明驱动器 6-Ch LED Backlt Drvr 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