参数资料
| 型号： | MC34703PNB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 30/46页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY QUICC 33-QFN |
| 标准包装： | 1 |
| 应用： | 电源 |
| 电流 - 电源： | 60mA |
| 电源电压： | 2.8 V ~ 13.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 33-PowerQFN |
| 供应商设备封装： | 33-PQFN（10x10） |
| 包装： | 管件 |
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TYPICAL APPLICATIONS
2 π × R 5 × C 2 × C 24
F s , p3 = -------------------------------------
F s , z1 = ----------------------------------
F s , z2 = ------------------------------------------------------
The location of the three poles and two zeros from the
transfer function is shown by the following equations:
F s , p1 = 0
C 2 + C 24
F s , p2 = -----------------------------------------------
1
2 π × R 12 × C 26
1
2 π × R 5 × C 24
1
2 π × ( R 9 + R 12 ) × C 26
Gain (dB)
F Fs,p1
for the type 3 compensation scheme. The poles and /or
zeroes are adjusted in order to shape the gain profile and
make sure the phase has sufficient margin (to meet the
system stability criteria).
F s,p 2
Fs,p2
Fs,p3 3
F s,z1
Fs,z1
Fs,z2
Frequency (Hz)
Phase (o)
90
0
Frequency (Hz)
- 90
Figure 29. Bode and Phase plot for Type Compensation Scheme
V output × ( V in – V output )
2 × I output × V in × F s
C O min = ----------------------------------------------- × ( 1 – D )
Output Inductor Calculation
If the output inductor is designed to guarantee the buck
regulator will operate at critical mode or continuous mode
within all load conditions, the following equation will be used
to calculate the inductance of the output inductor:
L ≥ ----------------------------------------------------------------------
Where L is the output inductor value in Henries, V in is the
input voltage in Volts, I output is the minimum output current in
Amps, and F s is the switching frequency in Hertz. In this
For example: Input voltage is 5.5 V, minimum output
current is 0.2 A, output voltage is 1.8 V, the operating
frequency is 300 kHz, the inductance of output inductor is
calculated as 10 μ H for an initial value.
Output Capacitor Calculating
The minimum capacitance of output capacitor could be
calculated from the following equation:
V output
8 × F s2 × L × ? V pp
equation, the magnitude of the ripple current is assumed as
2 times minimum load current.
34703
Analog Integrated Circuit Device Data
30
Freescale Semiconductor
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34704AEP | 功能描述:开关变换器、稳压器与控制器 DSC8 PASS.1.3 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 |
| 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 |
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