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MC34161DMR2G bảng dữ liệu(PDF) 9 Page - ON Semiconductor |
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9 / 18 page MC34161, MC33161, NCV33161 http://onsemi.com 9 The above figure shows the MC34161 configured as a dual negative overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when −VS1 or −VS2 exceeds V2. With the dashed line output connection, the circuit becomes a dual negative undervoltage detector. As the input voltage decreases from the peak towards ground, the LED will turn ‘ON’ when −VS1 or −VS2 falls below V1. For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is: Figure 18. Dual Negative Overvoltage Detector V 1 + R 1 R 2 (V th * Vref) ) Vth V 2 + R 1 R 2 (V th * VH * Vref) ) Vth * VH R 1 R 2 + V 1 * Vth V th * Vref R 1 R 2 + V 2 * Vth ) VH V th * VH * Vref + 1.27V + 1.27V + 2.8V + 0.6V + − 2.54V Reference − + − + + − 4 1 7 2 3 5 6 R1 −VS1 R1 −VS2 R2 R2 8 VCC Input −VS Output Voltage Pins 5, 6 GND V1 V2 VCC LED ‘ON’ VHys GND The above figure shows the MC34161 configured as a dual negative undervoltage detector. As the input voltage decreases towards ground, the LED will turn ‘ON’ when −VS1 or −VS2 falls below V1. With the dashed line output connection, the circuit becomes a dual negative overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when −VS1 or −VS2 exceeds V2. For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is: Figure 19. Dual Negative Undervoltage Detector V 1 + R 1 R 2 (V th * Vref) ) Vth V 2 + R 1 R 2 (V th * VH * Vref) ) Vth * VH R 1 R 2 + V 1 * Vth V th * Vref R 1 R 2 + V 2 * Vth ) VH V th * VH * Vref + 1.27V + 1.27V + 2.8V + 0.6V + − 8 − + − + + − 4 1 7 2 3 5 6 R1 −VS1 R1 −VS2 2.54V Reference R2 R2 VCC VHys Input −VS Output Voltage Pins 5, 6 GND V1 V2 VCC LED ‘ON’ GND |
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