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参数资料
| 型号： | KIT33701DWBEVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 30/39页 |
| 文件大小： | 0K |
| 描述： | KIT FOR 33701 POWER SUPPLY |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 2，非隔离 |
| 输入电压： | 2.8 ~ 6V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板，软件 |
| 已用 IC / 零件： | MC34701 |
| 相关产品： | MC34701EKR2CT-ND - IC POWER SUPPLY MCU 1A 32-SOIC MC34701EKR2TR-ND - IC POWER SUPPLY MCU 1A 32-SOIC MC34701EK-ND - IC POWER SUPPLY MCU 1A 32-SOIC |
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TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
BUCK REGULATOR CONTROL CIRCUIT
The 34701 buck regulator utilizes a PWM Voltage Mode
load regulation. The control circuit block diagram is shown in
topology with feed-forward to achieve an excellent line and
L
Figure 29. Buck Regulator Control Circuit
f z ? c ? = -------------------------------------------
The integrated 40pF capacitor C F charged through the
external resistor R4 provides the feed-forward ramp
waveform, the amplitude of which is proportional to the input
voltage, thus providing the feed-forward function.
Figure 30 shows the Bode plot of the 34701 buck regulator
control loop gain and phase versus frequency.
The first double pole on the Bode plot is created by the
buck regulator output L-C filter, and its frequency can be
1
2 ? C2 ? R1 + R3 ?
The Feed-Forward implemented by resistor R4 and
integrated capacitor C F creates a pole in the overall loop
transfer function, the frequency of which can be calculated
from the following formula.
f LC = -----------------------
f p ? FF ? = ---------------------------------------------------------------- ? -----------------------
------- ? -------------------------------- + V m1
calculated as:
1
2 ? C O L
V IN 1
1 ? V IN – V Ref ? 2 ? R4C F
f sw R4C F
Where C O is the value of the buck output capacitor and L
is the inductance value of the output filter inductor L.
The frequency of the compensating zero can be calculated
as follows.
Where V Ref is the buck regulator reference voltage ?
(V Ref = 0.8V typ.) at the INV pin, ?
V IN is the buck regulator input voltage, ?
V m1 is the ramp generated by the internal ramp
generator (V m1 = 0.5V typ.).
34701
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 |
|---|---|
| KIT33702DWBEVB | 功能描述:电源管理IC开发工具 33702 - QS2 EVAL KIT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| KIT33730EKEVBE | 功能描述:电源管理IC开发工具 SWITCH MODE PWR SUP RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| KIT33742DWEVB | 功能描述:网络开发工具 SBC WITH EHSCAN RoHS:否 制造商:Rabbit Semiconductor 产品:Development Kits 类型:Ethernet to Wi-Fi Bridges 工具用于评估:RCM6600W 数据速率:20 Mbps, 40 Mbps 接口类型:802.11 b/g, Ethernet 工作电源电压:3.3 V |
| KIT3376MMA7330L | 功能描述:加速传感器开发工具 XYZ-AXIS ANALOG ACCELERO RoHS:否 制造商:Murata 工具用于评估:SCA3100-D04 加速:2 g 传感轴:Triple Axis 接口类型:SPI 工作电压:3.3 V |
| KIT3376MMA7331L | 功能描述:加速传感器开发工具 3-AXIS ANALOG OUT 4g /12g Dev Kit RoHS:否 制造商:Murata 工具用于评估:SCA3100-D04 加速:2 g 传感轴:Triple Axis 接口类型:SPI 工作电压:3.3 V |
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