TLV9152SIRUGR datasheet(24/63 Pages) TI

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Cap Load (pF)

120

160

200

240

280

320

360

C008

RISO = 0 :, Positive Overshoot

RISO = 0 :, Negative Overshoot

RISO = 50 :, Positive Overshoot

RISO = 50 :, Negative Overshoot

Cap Load (pF)

120

160

200

240

280

320

360

C007

RISO = 0 :, Positive Overshoot

RISO = 0 :, Negative Overshoot

RISO = 50 :, Positive Overshoot

RISO = 50 :, Negative Overshoot

140ºC

3 V

0 V

150°C

16 V

100

VIN

3 V

–

OUT = 30 mA

TLV9151

TA = 100°C

PD = 0.39W

JA = 138.7°C/W

TJ = 138.7°C/W × 0.39W + 100°C

TJ = 154.1°C (expected)

–

Normal

Operation

Output

High-Z

TLV9151, TLV9152, TLV9154

SBOS986B – OCTOBER 2019 – REVISED MAY 2020

www.ti.com

Product Folder Links: TLV9151 TLV9152 TLV9154

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7.3.2 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 TLV915x is 150°C.

Exceeding this temperature causes damage to the device. The TLV915x has a thermal protection feature that

reduces 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 170°C. Figure 43 shows an application example for the

TLV9151 that has significant self heating 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 177°C. The actual device,

however, turns off the output drive to recover towards a safe junction temperature. Figure 43 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 the internal limit, the thermal

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

the condition that caused excessive power dissipation is not removed, the amplifier will oscillate between a

shutdown and enabled state until the output fault is corrected.

Figure 43. Thermal Protection

7.3.3 Capacitive Load and Stability

The TLV915x features a resistive output stage capable of driving moderate capacitive loads, and by leveraging

an isolation resistor, the device can easily be configured to drive large capacitive loads. Increasing the gain

enhances the ability of the amplifier to drive greater capacitive loads; see Figure 44 and Figure 45. The particular

op amp circuit configuration, layout, gain, and output loading are some of the factors to consider when

establishing whether an amplifier will be stable in operation.

Figure 44. Small-Signal Overshoot vs Capacitive Load (10-

mV Output Step, G = 1)

Figure 45. Small-Signal Overshoot vs Capacitive Load (10-

mV Output Step, G = –1)

TLV9152SIRUGR 数据表(PDF) 24 Page - Texas Instruments

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