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TLV3502: how to add the external hysteresis

Part Number: TLV3502
Other Parts Discussed in Thread: TINA-TI

Hi:

   Below is digested from the TLV3502 data sheet:

 8.1.1 Adding External Hysteresis

The TLV350x has a robust performance when used with a good layout. However, comparator inputs have little
noise immunity within the range of a specified offset voltage (±5 mV). For slow-moving or noisy input signals, the
comparator output can cause an undesirable switch state as input signals move through the switching threshold.
In such applications, the 6 mV of internal hysteresis of the TLV350x might not be sufficient. For greater noise
immunity, external hysteresis can be added by connecting a small amount of feedback to the positive input.
Figure 17 shows a typical topology used to introduce 25 mV of additional hysteresis, for a total of 31-mV
hysteresis when operating from a single 5-V supply. Use Equation 1 to calculate the approximate total hysteresis.

  In the equation (1) , what is the V+?  It's the power supply voltage (Vs)? or it is the reference voltage ( Vref  in Figure 17 )?

thanks

Zhang