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MC34161DMR2 Datasheet(PDF) 11 Page - ON Semiconductor |
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MC34161DMR2 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 18 page MC34161, MC33161, NCV33161 http://onsemi.com 11 The above figure shows the MC34161 configured as a positive and negative overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when either −VS1 exceeds V2, or VS2 exceeds V4. With the dashed line output connection, the circuit becomes a positive and negative undervoltage detector. As the input voltage decreases from the peak towards ground, the LED will turn ‘ON’ when either VS2 falls below V3, or −VS1 falls below V1. For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is: Figure 22. Positive and Negative Overvoltage Detector V 1 + R 3 R 4 (V th1 * Vref) ) Vth1 V 2 + R 3 R 4 (V th1 * VH1 * Vref) ) Vth1 * VH1 V 3 + (Vth2 * VH2) R 2 R 1 ) 1 V 4 + Vth2 R 2 R 1 ) 1 R 3 R 4 + (V 1 * Vth1) (V th1 * Vref) R 3 R 4 + (V 2 * Vth1 ) VH1) (V th1 * VH1 * Vref) R 2 R 1 + V 4 V th2 * 1 R 2 R 1 + V 3 V th2 * VH2 * 1 + 1.27V + 1.27V + 2.8V + 0.6V + − 2.54V Reference − + − + + − 4 1 7 2 3 5 6 R4 R3 −VS1 VS2 R1 R2 8 VCC Output Voltage Pins 5, 6 GND LED ‘ON’ VHys2 VHys1 VCC GND Input −VS1 V4 V3 V1 V2 Input VS2 The above figure shows the MC34161 configured as a positive and negative undervoltage detector. As the input voltage decreases toward ground, the LED will turn ‘ON’ when either VS1 falls below V1, or −VS2 falls below V3. With the dashed line output connection, the circuit becomes a positive and negative overvoltage detector. As the input voltage increases from the ground, the LED will turn ‘ON’ when either VS1 exceeds V2, or −VS1 exceeds V1. For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is: Figure 23. Positive and Negative Undervoltage Detector V 1 + (Vth1 * VH1) R 4 R 3 ) 1 V 2 + Vth1 R 4 R 3 ) 1 V 3 + R 1 R 2 (V th * Vref) ) Vth2 V 4 + R 1 R 2 (V th * VH2 * Vref) ) Vth2 * VH2 R 4 R 3 + V 2 V th1 * 1 R 4 R 3 + V 1 V th1 * VH1 * 1 R 1 R 2 + V 4 ) VH2 * Vth2 V th2 * VH2 * Vref R 1 R 2 + V 3 * Vth2 V th2 * Vref + 1.27V + 1.27V + 2.8V + 0.6V + − − + − + + − 4 1 7 2 3 5 6 2.54V Reference 8 VCC R3 VS1 R4 R1 R2 −VS2 V2 V1 V3 V4 GND VCC GND Output Voltage Pins 5, 6 Input −VS2 Input VS1 LED ‘ON’ VHys2 VHys1 |
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