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参数资料
| 型号： | MC34844EP |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 56/62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： | 490 |
| 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： | 托盘 |
| 工作温度： | -40°C ~ 105°C |
| 产品目录页面： | 809 (CN2011-ZH PDF) |
| 配用： | KIT34844EPEVME-ND - BOARD EVAL 10CH MC34844 LED DVR |
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COMPONENTS CALCULATION
C Comp1 = --------------------------------------------------------
33 × 10
V SLOPE × 5
C Comp2 = ---------------------------
2
f Cross × R Comp × π × 2
G M
6.28 × F SW
In order to improve the transient response of the boost, on
the 34844A, a resistor divider has been implemented from
the PWM pin to ground with a connection to the
compensation network. This configuration should inject a
1.0 V signal to the COMP pin and the Thevenin-equivalent
resistance of the divider is close to R COMP , i.e. R COMP = 6.8 k
and R PCOMP = 27 k for a 5.0 V PWM signal.
PWM
C COMP1
3
R SLOPE = -----------------------------
Variable Definition
D= Boost Duty Cycle
V OUT = Output Voltage
V D = Diode Forward Voltage
V IN = Input Voltage
V SW = V DROP of Internal Switch
Δ V OUT = Output Voltage Ripple Ratio
IIN AVG = Average Input Current
I OUT = Output Current
r=Input Current Ratio
IIN MAX = Maximum input current
IRMS CIN = RMS current for Input Capacitor
IRMS COUT = RMS current for Output Capacitor
L= Inductor
R PCOMP
R COMP
C COMP2
COMP PIN
R W = Inductor winding DC Resistance
f SW = Boost Switching Frequency
CSG= Current Sense Gain = 0.2 V/A
A CSA = Current Sense Amplifier Gain = 9
R SENSE = Current Sense Resistor = 22mohm
C OUT = Output Capacitor
V SLOPE = ----------------------------------------------------
Slope Compensation
Slope Compensation can be expressed either in terms of
Ampers/Second or as Volts/Second, through the use of the
transfer resistance.
The following formula express the Slope Compensation in
terms of V/ μ s:
( Vout – Vin ) × CSG
L × 2
R COMP = Compensation Resistor
G M = OTA Transconductance
ESR COUT = ESR of Output Capacitor
f RHPZ = Right Half Plane Zero Frequency
f CROSS = Crossover Frequency
C COMP1 = Compensation Capacitor
C COMP2 = Shunt Compensation Capacitor
V SLOPE = Slope Compensation (V/ μ s)
R SLOPE = External Resistor for Slope Compensation
Where “L” is in μ H
In order to have this slope compensation, the following
resistor should be set.
34844
Analog Integrated Circuit Device Data
56
Freescale Semiconductor
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34844EPR2 | 功能描述:LED照明驱动器 BACKLIGHT LED DRIVER W/10 CHANNELS 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 |
| 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 |
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