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| 型号： | MC34844EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 55/62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： | 2,500 |
| 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： | 带卷 (TR) |
| 工作温度： | -40°C ~ 105°C |
| 配用： | KIT34844EPEVME-ND - BOARD EVAL 10CH MC34844 LED DVR |
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COMPONENTS CALCULATION
COMPONENTS CALCULATION
The following formulas are intended for the calculation of
R Comp × 5 × G M × Iout × L
( 1 – D ) × Vout × CSG
Vout + V D – Vin
Iin avg = -------------
Vout × Δ Vout × F SW × L
ESR Cout = ---------------------------------------------------------------
( Vin – V SW – ( Iin avg × rw ) ) × D
Iin avg × r × F SW
Irms Cout = Iout × -------------
= Iin avg + -------------------------------------------------
Iin max
all external components related with the Boost converter and
Network compensation.
In order to calculate a Duty Cycle, the internal losses of the
MOSFET and Diode should be taken into consideration.
D = ---------------------------------------------
Vout + V D – V SW
The average input current depends directly to the output
current when the internal switch is off.
Iout
1 – D
Inductor
For calculating the Inductor we should consider the losses
of the internal switch and winding resistance of the inductor.
L = ----------------------------------------------------------------------------------
It is important to look for an inductor rated at least for the
maximum input current.
Vin × ( Vout – Vin )
2 × L × F SW × Vout
Input Capacitor
CSG = A CSA × R Sense
Cout = --------------------------------------------------------------------
The output voltage ripple ( Δ V OUT ) depends on the ESR of
the Output capacitor, for a low output voltage ripple it is
recommended to use Ceramic capacitors that usually have
very low ESR. Since ceramic capacitor are expensive,
Electrolytic or Tantalum capacitors can be mixed with
ceramic capacitors to have a cheaper solution.
Vout × ( 1 – D )
The output capacitor should handle at least the following
RMS current.
Network Compensation
Since this Boost converter is current controlled, Type II
compensation is needed.
D
1 – D
I order to calculate the Network Compensation, first we
need to calculate all Boost Converter components.
For this type of compensations we need to push out the
Right Half Plane Zero to higher frequencies where it can’t
affect the overall loop significantly.
Vout × ( 1 – D )
f RHPZ = ----------------------------------------
The input capacitor should handle at least the following
RMS current.
2
Iout × 2 × π × L
The Crossover frequency must be set much lower than the
location of the Right half plane zero
Irms Cin = ? ? ? ? × 0.3
f Cross = ---------------
Vin × ( Vout – Vin )
------------------------------------------------
2 × L × F SW × Vout
Output Capacitor
For the output capacitor selection the internal current
sense gain (CSG) and the Transconductance should be
taken in consideration.
The CSG is the internal R SENSE times the current sense
amplifier gain (A CSA ).
f RHPZ
5
Since our system has a fixed Slope compensation set by
R SLOPE , R COMP should be fixed for all configurations.
R Comp = 5.6kohm
C COMP1 and C COMP2 should be calculated as follows:
34844
Analog Integrated Circuit Device Data
Freescale Semiconductor
55
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
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