TLV431ILPR datasheet(21/54 Pages) TI

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8.2 Typical Applications

8.2.1 Comparator with Integrated Reference (Open Loop)

Figure 8-2. Comparator Application Schematic

8.2.1.1 Design Requirements

For this design example, use the parameters listed in Table 8-1 as the input parameters.

Table 8-1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Input Voltage Range

0V to 5V

Input Resistance

10kΩ

Supply Voltage

Cathode Current (Ik)

500µA

Output Voltage Level

~1V - Vsup

Logic Input Thresholds VIH/VIL

8.2.1.2 Detailed Design Procedure

When using TLV431 as a comparator with reference, determine the following:

• Input voltage range

• Reference voltage accuracy

• Output logic input high and low level thresholds

• Current source resistance

8.2.1.2.1 Basic Operation

In the configuration shown in Figure 8-2 TLV431 will behave as a comparator, comparing the Vref pin voltage

to the internal virtual reference voltage. When provided a proper cathode current (Ik), TLV431 will have enough

open-loop gain to provide a quick response. With the TLV431's maximum operating current (Imin(max)) being

100µA and up to 150µA over temperature, operation below that could result in low gain, leading to a slow

response.

8.2.1.2.2 Overdrive

Slow or inaccurate responses can also occur when the reference pin is not provided enough overdrive voltage.

This is the amount of voltage that is higher than the internal virtual reference. The internal virtual reference

voltage will be within the range of 1.24V ±(0.5%, 1.0%, or 1.5%) depending on which version is being used.

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TLV431, TLV431A, TLV431B

SLVS139Z – JULY 1996 – REVISED JUNE 2024

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