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MC34161D Datasheet(PDF) 10 Page - ON Semiconductor |
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MC34161D Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 18 page MC34161, MC33161, NCV33161 http://onsemi.com 10 The above figure shows the MC34161 configured as a positive voltage window detector. This is accomplished by connecting channel 1 as an undervoltage detector, and channel 2 as an overvoltage detector. When the input voltage VS falls out of the window established by V1 and V4, the LED will turn ‘ON’. As the input voltage falls within the window, VS increasing from ground and exceeding V2, or VS decreasing from the peak towards ground and falling below V3, the LED will turn ‘OFF’. With the dashed line output connection, the LED will turn ‘ON’ when the input voltage VS is within the window. For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is: Figure 20. Positive Voltage Window Detector V1 + (Vth1 * VH1) R3 R1 ) R2 ) 1 V3 + (Vth2 * VH2) R2 ) R3 R1 ) 1 V2 + Vth1 R3 R1 ) R2 ) 1 V4 + Vth2 R2 ) R3 R1 ) 1 R2 R1 + V3(Vth2 * VH2) V1(Vth1 * VH1) * 1 R3 R1 + V3(V1 * Vth1 ) VH1) V1(Vth2 * VH2) R2 R1 + V4 xVth1 V2 xVth2 * 1 R3 R1 + V4(V2 * Vth1) V2 xVth2 + 1.27V + 1.27V + 2.8V + 0.6V + - 2.54V Reference - + - + + - 4 1 7 2 3 5 6 VS R3 R1 R2 8 VCC Output Voltage Pins 5, 6 GND CH2 CH1 LED `ON' VHys2 VHys1 LED `ON' `OFF' LED `OFF' `ON' V4 V3 V2 V1 VCC GND Input VS The above figure shows the MC34161 configured as a negative voltage window detector. When the input voltage −VS falls out of the window established by V1 and V4, the LED will turn ‘ON’. As the input voltage falls within the window, −VS increasing from ground and exceeding V2, or −VS decreasing from the peak towards ground and falling below V3, the LED will turn ‘OFF’. With the dashed line output connection, the LED will turn ‘ON’ when the input voltage −VS is within the window. For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is: Figure 21. Negative Voltage Window Detector V1 + R1(Vth2 * Vref) R2 ) R3 ) Vth2 V2 + R1(Vth2 * VH2 * Vref) R2 ) R3 ) Vth2 * VH2 V3 + (R1 ) R2)(Vth1 * Vref) R3 ) Vth1 V4 + (R1 ) R2)(Vth1 * VH1 * Vref) R3 ) Vth1 * VH1 R1 R2 ) R3 + V1 * Vth2 Vth2 * Vref R1 R2 ) R3 + V2 * Vth2 ) VH2 Vth2 * VH2 * Vref R3 R1 ) R2 + Vth1 * Vref V3 * Vth1 R3 R1 ) R2 + Vth1 * VH1 * Vref V4 ) VH1 * Vth1 + 1.27V + 1.27V + 2.8V + 0.6V + - - + - + + - 4 1 7 2 3 5 6 2.54V Reference R3 R1 R2 -VS 8 VCC Output Voltage Pins 5, 6 GND CH2 CH1 V1 V2 V3 V4 VCC GND Input -VS LED `ON' LED `ON' `OFF' LED `OFF' `ON' VHys1 VHys2 |
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