TLV9301 datasheet(21/48 Pages) TI1

21 / 48 page

Cload

Vin

Vout

+Vs

Riso

-Vs

Cap Load (pF)

200

400

600

800

1000

C007

Positive overshoot

Negative overshoot

Cap Load (pF)

120

160

200

240

280

320

360

C008

Positive overshoot

Negative overshoot

TLV9301, TLV9302, TLV9304

www.ti.com

SBOS941A – FEBRUARY 2019 – REVISED APRIL 2019

Product Folder Links: TLV9302

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7.3.5 Capacitive Load and Stability

The TLV930x features a resistive output stage capable of driving smaller 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 46 and Figure 47. The particular

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

establishing whether an amplifier is stable in operation.

Figure 46. Small-Signal Overshoot vs Capacitive Load

(100-mV Output Step, G = 1)

Figure 47. Small-Signal Overshoot vs Capacitive Load

(100-mV Output Step, G = -1)

For additional drive capability in unity-gain configurations, improve capacitive load drive by inserting a small (10

Ω to 20 Ω) resistor, RISO, in series with the output, as shown in Figure 48. This resistor significantly reduces

ringing and maintains DC performance for purely capacitive loads. However, if a resistive load is in parallel with

the capacitive load, then a voltage divider is created, thus introducing a gain error at the output and slightly

reducing the output swing. The error introduced is proportional to the ratio RISO / RL, and is generally negligible at

low output levels. A high capacitive load drive makes the TLV930x well suited for applications such as reference

buffers, MOSFET gate drives, and cable-shield drives. The circuit shown in Figure 48 uses an isolation resistor,

RISO, to stabilize the output of an op amp. RISO modifies the open-loop gain of the system for increased phase

margin. For additional information on techniques to optimize and design using this circuit, TI Precision Design

TIDU032 details complete design goals, simulation, and test results.

Figure 48. Extending Capacitive Load Drive With the TLV9301

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