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RISO

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CL

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TLV6003

SLOS981 – OCTOBER 2019

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Copyright © 2019, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

8.1.1 Drive a Capacitive Load

The TLV6003 is internally compensated for stable unity-gain operation, with a 5.5-kHz typical gain bandwidth.

However, the unity gain follower is the most sensitive configuration to capacitive load. The combination of a

capacitive load placed directly on the output of an amplifier along with the amplifier output impedance creates a

phase lag, which reduces the phase margin of the amplifier. If the phase margin is significantly reduced, the

response will be underdamped, which causes peaking in the transfer function. This condition creates very low

phase margin, and leads to excessive ringing or oscillations.

In order to drive heavy (> 50 pF) capacitive loads, an isolation resistor (RISO) must be used, as shown in

Figure 31. By using this isolation resistor, the capacitive load is isolated from the amplifier output. The higher the

value of RISO, the more stable the amplifier. If the value of RISO is sufficiently high, the feedback loop is stable,

independent of the value of CL. However, larger values of RISO result in reduced output swing and reduced

output current drive. The recommended value for RISO is 30 kΩ to 50 kΩ.

Figure 31. Resistive Isolation of Capacitive Load