SS1881(2012) 查看數據表（PDF） - SEC Electronics Inc.
零件编号
产品描述 (功能)
生产厂家
SS1881 Datasheet PDF : 9 Pages
| |||
SS1881
Hall Latch - High Sensitivity
Application Information
It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor) between the
supply(VDD Pin) and ground(GND Pin) of the device to reduce both external noise and noise generated by the chopper stabilization
technique. As is shown in the two figures in next page, a 0.1μF capacitor is typical.
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 100Ω/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.
Typical Three-Wire Application Circuit
C1
VDD
R2
OUT
S1881
C2
GND
Automotive and Severe
Environment Protection Circuit
R1:100
C1
VDD
R2
D1
Z1
S1881 OUT
C2
GND
The SS1881 have been optimized for commutation applications in 5V and 12V brushless DC motors. The follow figure is the typical
application circuit for 3 phase brushless DC motors.
6
V2.00 May.1, 2012
Share Link: 