graph LR
subgraph "LNB供电链路"
A["外部12-24VDC输入"] --> B["TVS保护阵列 \n 防雷击感应"]
B --> C["自恢复保险丝 \n 过流保护"]
C --> D["π型滤波器 \n CLC结构"]
D --> E["供电控制节点"]
E --> F["VBN1101N \n LNB供电开关"]
F --> G["输出滤波网络"]
G --> H["LNB供电输出 \n 13/18VDC"]
H --> I["同轴连接器 \n 带滤波功能"]
I --> J["LNB设备"]
end
subgraph "极化切换控制"
K["MCU控制信号"] --> L["电平转换电路"]
L --> M["VBTA3615M \n 双路开关"]
subgraph M["极化电压切换"]
direction LR
POL_H["水平极化 \n 18V"]
POL_V["垂直极化 \n 13V"]
end
M --> N["极化选择输出"]
N --> I
end
subgraph "监控与保护"
O["电流检测电阻"] --> P["差分放大器"]
P --> Q["ADC输入"]
R["温度传感器"] --> S["MCU ADC"]
T["电压监控"] --> U["比较器电路"]
U --> V["故障指示"]
end
style F fill:#e8f5e8,stroke:#4caf50,stroke-width:2px
style M fill:#fff3e0,stroke:#ff9800,stroke-width:2px
DC-DC同步整流电源拓扑详图
graph LR
subgraph "同步整流降压转换器"
A["12V输入母线"] --> B["输入电容阵列 \n MLCC+电解"]
B --> C["高频降压控制器"]
C --> D["上管驱动信号"]
C --> E["下管驱动信号"]
D --> F["VBQF1101N \n 上管MOSFET"]
E --> G["VBQF1101N \n 下管MOSFET"]
F --> H["开关节点"]
G --> H
H --> I["功率电感"]
I --> J["输出电容阵列"]
J --> K["1.2V输出 \n FPGA核心供电"]
subgraph "电流检测"
L["电流检测电阻"] --> M["电流检测放大器"]
M --> N["过流保护"]
end
H --> L
end
subgraph "多路负载点电源"
O["12V输入母线"] --> P["POL转换器1 \n 12V→3.3V/2A"]
O --> Q["POL转换器2 \n 12V→2.5V/1.5A"]
O --> R["POL转换器3 \n 12V→1.8V/1A"]
P --> S["ADC供电"]
Q --> T["PLL供电"]
R --> U["DSP供电"]
subgraph "电源排序"
V["电源时序控制器"] --> P
V --> Q
V --> R
end
end
subgraph "热管理与布局"
W["一级散热: 散热过孔阵列"] --> F
W --> G
X["二级散热: 铜箔面积"] --> I
Y["三级隔离: 电源区域屏蔽"] --> A
Y --> K
end
style F fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
style G fill:#e3f2fd,stroke:#2196f3,stroke-width:2px
信号通路与智能控制拓扑详图
graph LR
subgraph "射频信号链路"
A["LNB中频输入 \n 950-2150MHz"] --> B["射频开关矩阵"]
B --> C["可调衰减器 \n 0-31.5dB"]
C --> D["低噪声放大器 \n 增益状态可调"]
D --> E["带通滤波器"]
E --> F["增益放大器"]
F --> G["ADC驱动器"]
G --> H["高速ADC"]
end
subgraph "智能控制接口"
I["主控MCU"] --> J["GPIO控制线"]
J --> K["电平转换"]
K --> L["VBTA3615M \n 双路开关IC"]
subgraph L ["开关控制功能"]
direction TB
CTRL1["LNA偏置切换"]
CTRL2["衰减器控制"]
CTRL3["增益状态"]
CTRL4["通道选择"]
end
L --> C
L --> D
L --> B
I --> M["I2C控制总线"]
M --> N["射频开关控制器"]
N --> B
M --> O["衰减器控制器"]
O --> C
M --> P["LNA偏置控制器"]
P --> D
end
subgraph "偏置与供电管理"
Q["3.3V数字电源"] --> R["LDO稳压器"]
R --> S["2.5V模拟电源"]
S --> T["偏置生成电路"]
T --> U["LNA偏置电压"]
U --> D
subgraph "电源开关控制"
V["VBTA3615M"] --> W["外围接口电源"]
V --> X["显示单元电源"]
V --> Y["通信模块电源"]
end
I --> V
end
subgraph "EMI抑制措施"
Z1["屏蔽腔体隔离"] --> A
Z1 --> H
Z2["滤波电容阵列"] --> Q
Z2 --> S
Z3["铁氧体磁珠"] --> J
Z3 --> M
end
style L fill:#fff3e0,stroke:#ff9800,stroke-width:2px
style V fill:#fff3e0,stroke:#ff9800,stroke-width:2px
点击下载：VBTA3615M规格书
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