参数资料
| 型号： | MC34704AEP |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 41/54页 |
| 文件大小： | 0K |
| 描述： | IC POWER MANAGEMENT 56-QFN |
| 特色产品： | MC34704 Multi-channel Power Management IC (PMIC) |
| 标准包装： | 260 |
| 应用： | 处理器 |
| 电流 - 电源： | 86mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-VFQFN 裸露焊盘 |
| 供应商设备封装： | 56-QFN-EP（7x7） |
| 包装： | 管件 |
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FUNCTIONAL DEVICE OPERATION
COMPONENT CALCULATION
Io max T [s]
Δ Iostep
RB = ---------------------
Vo -
1. First calculate the dt_I (inductor current rising time)
given by:
dtI = --------------------
Where the parameter Δ Io_step is the maximum current
step during the current rising time and is define as:
? R1 and RB: These two resistors help to set the output
voltage to the desire value using a Vref=0.6 V, select R1
between 10 k and 100 K and then calculate RB as follows:
R1
[ Ω ]
----------- – 1
Vref
? Compensation network. (C1,C2,C3, R2, R3): For
compensating a buck converter, 3 important frequencies
Δ Iostep = ? ? ? ? ? ? ? ?
D max Vin min – Vo
------------- -------------------------------
Fsw L
[A]
referring to the plant are:
1. Output LC filter cutoff frequency (F LC ):
2. Then the output capacitor can be chosen as follow:
C OUT ≤ ----------------------
F LC = --------------------------
2 π LC
Io max dtI
Δ Vo max
[A]
1
OUT
2. Cutoff frequency due to capacitor ESR:
[Hz]
F ESR = --------------------------------------
? Where Δ VO max is the maximum allowed transient
overshoot expressed as a percentage of the output
voltage, typically from 3 to 5% of Vo.
3. Finally find the maximum allowed ESR to allow the
desired transient response:
1
2 π ( C OUT ) ESR
3. Crossover frequency (or bandwidth):
[Hz]
Δ Vo r ( Fsw ) ( L )
Vo ( 1 – D min )
F BW = ----------
ESR max = -------------------------------------- [ Ω ]
NOTE: Do not use the parameters Δ VO r and Δ VO max
indistinctly, the first one indicates the output voltage ripple,
F SW [Hz]
10
The Type 3 external compensation network will be in
charge of canceling some of these poles and zeros to
achieve stability in the system. The following poles and
zeroes frequencies are provided by the type 3 compensation.
while the second one is the maximum output voltage
overshoot (transient response).
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
41
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相关代理商/技术参数 |
参数描述 |
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| MC34704AEPR2 | 功能描述:开关变换器、稳压器与控制器 DSC8 PASS1.3 TAPE RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34704BEP | 功能描述:开关变换器、稳压器与控制器 5CH DC-DC PWR MANGMNET I RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34704BEPR2 | 功能描述:开关变换器、稳压器与控制器 5CH DC-DC PWR MANGMNET RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34705 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 12WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 12WAY |
| MC34707 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 14WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 14WAY 制造商:PRIVATE LABEL 功能描述:HEADER, VERTICAL, 14WAY, Product Range:MULTICOMP - MC34 Series, Contact Terminat 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 14POS, 3MM, Series:2261(5561), Pitch Spacing:3mm, Contact Termination:Through Hole Vertical, No. of Contacts:14, No. of Rows:2, Connector Mounting:PCB, Gender:Receptacle, Contact Material:Copper Alloy , RoHS Compliant: Yes |
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