DIO20872B

Version 1.2, Oct 2024

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© 2024 DIOO MICROCIRCUITS CO., LTD.

7

Figure 9 is the equivalent resistor networks when the output is high and low. Note that RPU should be in

series with R3 when the output is high. RPU should be at least 10 times less than R3.

Figure 9. Inverting configuration resistor equivalent networks

When VIN is less than VA, the output voltage is high (for simplicity, assume VO switches as high as VCC). The

three network resistors can be represented as R1 || R3 in series with R2, as shown in Figure 9.

Equation (1) below defines the high-to-low trip voltage (VA1).

������1=���������× ���2���1||���3+���2

(1)

When VIN is greater than VA, the output voltage is low. In this case, the three network resistors can be

presented as R2 || R3 in series with R1, as shown in Equation (2).

Use Equation (2) to define the low to high trip voltage (VA2).

������2=���������× ���2||���3

���1+ ���2||���3

(2)

Equation (3) defines the total hysteresis provided by the network.

∆������=������1−������2

(3)

7.1.2. Non-inverting comparator with hysteresis

A non-inverting comparator with hysteresis requires a two-resistor network and a voltage reference (VREF)

at the inverting input, as shown in Figure 10.

Figure 10. Non-inverting configuration with hysteresis

Figure 11 shows the equivalent resistor networks when the output is high and low. Note that RPU should be

in series with R2 when the output is high. RPU should be at least 10 times less than R2.