TLV9352IDDFR datasheet(21/53 Pages) TI

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7.3.3 Phase Reversal Protection

The TLV935x family has internal phase-reversal protection. Many op amps exhibit a phase reversal when the

input is driven beyond its linear common-mode range. This condition is most often encountered in noninverting

circuits when the input is driven beyond the specified common-mode voltage range, causing the output to

reverse into the opposite rail. The TLV935x is a rail-to-rail input op amp; therefore, the common-mode range can

extend up to the rails. Input signals beyond the rails do not cause phase reversal; instead, the output limits into

the appropriate rail.

7.3.4 Thermal Protection

The internal power dissipation of any amplifier causes its internal (junction) temperature to rise. This

phenomenon is called self heating. The absolute maximum junction temperature of the TLV935x is 150°C.

Exceeding this temperature causes damage to the device. The TLV935x has a thermal protection feature that

prevents damage from self heating. The protection works by monitoring the temperature of the device and

turning off the op amp output drive for temperatures above 140°C. Figure 7-4 shows an application example for

the TLV9351 that has significant self heating (159°C) because of its power dissipation (0.81 W). Thermal

calculations indicate that for an ambient temperature of 65°C the device junction temperature must reach 187°C.

The actual device, however, turns off the output drive to maintain a safe junction temperature. Figure 7-4 shows

how the circuit behaves during thermal protection. During normal operation, the device acts as a buffer so the

output is 3 V. When self heating causes the device junction temperature to increase above 140°C, the thermal

protection forces the output to a high-impedance state and the output is pulled to ground through resistor RL.

140ºC

3 V

0 V

150°C

30 V

100

VIN

3 V

–

OUT = 30 mA

TLV9351

TA = 65°C

PD = 0.81W

JA = 138.7°C/W

TJ = 138.7°C/W × 0.81W + 65°C

TJ = 177.3°C (expected)

–

Figure 7-4. Thermal Protection

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TLV9351, TLV9352, TLV9354

SBOS994C – NOVEMBER 2019 – REVISED DECEMBER 2020

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