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NCV33161 Datasheet(PDF) 9 Page - ON Semiconductor |
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NCV33161 Datasheet(HTML) 9 Page - ON Semiconductor |
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 V1 + R1 R2 (Vth * Vref) ) Vth V2 + R1 R2 (Vth * VH * Vref) ) Vth * VH R1 R2 + V1 * Vth Vth * Vref R1 R2 + V2 * Vth ) VH Vth * 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 V1 + R1 R2 (Vth * Vref) ) Vth V2 + R1 R2 (Vth * VH * Vref) ) Vth * VH R1 R2 + V1 * Vth Vth * Vref R1 R2 + V2 * Vth ) VH Vth * 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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