TLV9352IDDFR datasheet(22/45 Pages) TI1

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load

out

iso

-V

Cap Load (pF)

500 1000 1500 2000 2500 3000 3500 4000 4500 5000

C008

RISO = 0 , Positive Overshoot

RISO = 0 , Negative Overshoot

RISO = 50 , Positive Overshoot

RISO = 50 , Negative Overshoot

Cap Load (pF)

500 1000 1500 2000 2500 3000 3500 4000 4500 5000

C007

RISO = 0 , Positive Overshoot

RISO = 0 , Negative Overshoot

RISO = 50 , Positive Overshoot

RISO = 50 , Negative Overshoot

TLV9352

SBOS994A – NOVEMBER 2019 – REVISED MARCH 2020

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Product Folder Links: TLV9352

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7.3.5 Capacitive Load and Stability

The TLV935x 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 TLV935x 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 TLV9351

TLV9352IDDFR Datasheet(PDF) 22 Page - Texas Instruments

TLV9352IDDFR Datasheet(HTML) 22 Page - Texas Instruments

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