Datasheet

LM6172
www.ti.com SNOS792D –MAY 1999–REVISED MARCH 2013
Another possible source of overshoot and undershoot comes from capacitive load at the output. Please see
DRIVING CAPACITIVE LOADS for more detail.
DRIVING CAPACITIVE LOADS
Amplifiers driving capacitive loads can oscillate or have ringing at the output. To eliminate oscillation or reduce
ringing, an isolation resistor can be placed as shown in Figure 43. The combination of the isolation resistor and
the load capacitor forms a pole to increase stability by adding more phase margin to the overall system. The
desired performance depends on the value of the isolation resistor; the bigger the isolation resistor, the more
damped (slow) the pulse response becomes. For LM6172, a 50Ω isolation resistor is recommended for initial
evaluation.
Figure 43. Isolation Resistor Used to Drive Capacitive Load
Figure 44. The LM6172 Driving a 510pF Load with a 30Ω Isolation Resistor
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