收藏本站
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
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MC34845AEPR2 IC LED DVR BACKLIGHT 6CH 24QFN
MC34845BEPR2 IC LED DVR BACKLIGHT 6CH 24QFN
MC34848EPR2 IC LED DVR BACKLIGHT 8CH 48QFN
MC56F8006DEMO-T BOARD DEMO FOR MC56F8006 DSP
MCB1114 BOARD EVALUATION FOR NXP LPC1114
MCB11C14 BOARD EVAL FOR NXP LPC11C14
MCB2470 BOARD EVAL NXP LPC247X SERIES
MCBSTM32EXL BOARD EVALUATION FOR STM32F103ZE
相关代理商/技术参数
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
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
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