7.3.1 Operating Characteristics

The TLVx171-Q1 family of devices is specified for operation from 4.5 V to 36 V (±2.25 V to ±18 V). Many of the specifications apply from –40°C to +125°C. Parameters that can exhibit significant variance with regard to operating voltage or temperature are shown in Typical Characteristics.

7.3.2 Phase-Reversal Protection

The TLVx171-Q1 family of devices has an internal phase-reversal protection. Many op amps exhibit a phase reversal when the input is driven beyond the 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 input of the TLVx171-Q1 family of devices prevents phase reversal with excessive common-mode voltage. Instead, the output limits into the appropriate rail. Figure 26 shows this performance.

Figure 26. No Phase Reversal

7.3.3 Capacitive Load and Stability

The dynamic characteristics of the TLVx171-Q1 family of devices are optimized for commonly encountered operating conditions. The combination of low closed-loop gain and high capacitive loads decreases the phase margin of the amplifier and can lead to gain peaking or oscillations. As a result, heavier capacitive loads must be isolated from the output. The simplest way to achieve this isolation is to add a small resistor (for example, R_OUT equal to 50 Ω) in series with the output. Figure 27 and Figure 28 shows small-signal overshoot versus capacitive load for several values of R_OUT. For details of analysis techniques and application circuits, see Applications Bulletin AB-028, available for download from TI.com.

RL = 10 kΩ

Figure 27. Small-Signal Overshoot versus Capacitive Load (100-mV Output Step)

Figure 28. Small-Signal Overshoot versus Capacitive Load (100-mV Output Step)

7.4.1 Common-Mode Voltage Range

The input common-mode voltage range of the TLVx171-Q1 family of devices extends 100 mV below the negative rail and within 2 V of the top rail for normal operation.

This device can operate with full rail-to-rail input 100 mV beyond the top rail, but with reduced performance within 2 V of the top rail. The typical performance in this range is listed in Table 3.