TLVH431ACDBVT datasheet(17/54 Pages) TI

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8.2 Typical Applications

8.2.1 Comparator With Integrated Reference (Open Loop)

1.24 V

CATHODE

ANODE

REF

VIN

Vout

Vsup

Rsup

RIN

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

~1 V - Vsup

Logic Input Thresholds VIH/VIL

8.2.1.2 Detailed Design Procedure

When using TLVH431 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, TLVH431 behaves as a comparator, comparing the Vref pin voltage to

the internal virtual reference voltage. When provided a proper cathode current (Ik), TLVH431 will have enough

open loop gain to provide a quick response. With the TLVH431's max Operating Current (Imin) being 100 uA and

up to 150 uA over temperature, operation below that could result in low gain, leading to a slow response.

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TLVH431, TLVH431A, TLVH431B, TLVH432, TLVH432A, TLVH432B

SLVS555N – NOVEMBER 2004 – REVISED JUNE 2024

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