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US4881 参数 Datasheet PDF下载

US4881图片预览
型号: US4881
PDF下载: 下载PDF文件 查看货源
内容描述: 双极霍尔开关低压&非常高的灵敏度 [Bipolar Hall Switch Low Voltage & Very High Sensitivity]
分类和应用: 开关
文件页数/大小: 11 页 / 442 K
品牌: MELEXIS [ Melexis Microelectronic Systems ]
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US4881  
Bipolar Hall Switch  
Low Voltage & Very High Sensitivity  
12 Application Information  
12.1 Typical Three-Wire Application Circuit  
12.2 Two-Wire Circuit  
12.3 Automotive and Harsh, Noisy Environments  
Three-Wire Circuit  
Note:  
With this circuit, precise ON and OFF  
currents can be detected using only two  
connecting wires.  
The resistors RL and Rb can be used to  
bias the input current. Refer to the part  
specifications for limiting values.  
BRP  
BOP  
:
:
IOFF = IR + IDD = VDD/Rb + IDD  
ION = IOFF + IOUT = IOFF + VDD/RL  
13 Application Comments  
For proper operation, a 100nF bypass capacitor should be placed as close as possible to the device between  
the VDD and ground pin.  
For reverse voltage protection, it is recommended to connect a resistor or a diode in series with the VDD pin.  
When using a resistor, three points are important:  
- the resistor has to limit the reverse current to 50mA maximum (VCC / R1 50mA)  
- the resulting device supply voltage VDD has to be higher than VDD min (VDD = VCC – R1.IDD)  
- the resistor has to withstand the power dissipated in reverse voltage condition (PD = VCC2 / R1)  
When using a diode, a reverse current cannot flow and the voltage drop is almost constant (0.7V).  
Therefore, a 100/0.25W resistor for 5V application and a diode for higher supply voltage are recommended.  
Both solutions provide the required reverse voltage protection.  
When a weak power supply is used or when the device is intended to be used in noisy environment, it is  
recommended that figure 13.3 from the Application Information section is used.  
The low-pass filter formed by R1 and C1 and the zener diode Z1 bypass the disturbances or voltage spikes  
occurring on the device supply voltage VDD. The diode D1 provides additional reverse voltage protection.  
3901004881  
Rev 011  
Page 7 of 11  
Data Sheet  
Feb/06