7.2 Typical Application

7.2.1 Implementing Adjustable Hysteresis

A comparator can produce “chatter” (multiple transitions) at the output when there are noise or signal variations

around the reference threshold; this causes the output to change states in rapid random successions as the

comparator input goes above and below the threshold of the reference. This usually occurs when the input signal

is moving very slowly across the switching threshold of the comparator. This problem can be prevented by using

the internal hysteresis feature of the TLV3603-EP.

The TLV3603-EP has a LE/HYS pin that allows for variable internal hysteresis depending on the resistor value

connected between the pin and VEE, where increasing the resistance decreases the hysteresis to a minimum

level.

7.2.1.1 Design Requirements

For this design, follow these design requirements.

Table 7-1. Design Parameters

PARAMETER

VALUE

Supply Voltage (VCC)

5V

VREF

2.5V

VHYS

30mV

Lower Threshold (VL)

2.485V

Upper Threshold (VH)

2.515V

7.2.1.2 Detailed Design Procedure

The hysteresis vs. resistance curve (Figure 8-2) is used as guidance to set the desired amount of hysteresis.

Figure 7-7. VHYST vs. RHYST at 5V curve

OUT

+

VEE

VCC

LE/HYS

IN+

IN-

150k

Figure 7-8. Setting the Hysteresis using a Resistor

using the TLV3603-EP

Figure 8-2 shows that for a 30mV hysteresis, a 150kΩ resistor must be placed from the LE/HYS pin to VEE, as

shown in Figure 7-8.

Also possible is to use an external voltage to dynamically program the VHYST. Please see the Adjustable

Hysteresis section for more details.

TLV3603-EP

SNOSDK3 – SEPTEMBER 2024

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