Datasheet
www.ti.com
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C
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55 kΩ
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USING LOW-ESR CAPACITORS
3.3-V VERSUS 1.6-V OPERATION
TPA6100A2D
SLOS269B – JUNE 2000 – REVISED SEPTEMBER 2004
Low-ESR capacitors are recommended throughout this application. A real capacitor can be modeled simply as a
resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the beneficial effects of
the capacitor in the circuit. The lower the equivalent value of this resistance, the more the real capacitor behaves
like an ideal capacitor.
The TPA6100A2D was designed for operation over a supply range of 1.6 V to 3.6 V. There are no special
considerations for 1.6-V versus 3.3-V operation as far as supply bypassing, gain setting, or stability. The most
important consideration is that of output power. Each amplifier can produce a maxium output voltage swing within
a few hundred millivolts of the rails with a 10-k Ω load. However, this voltage swing decreases as the load
resistance decreases and the r
DS(on)
as the output stage transistors becomes more significant. For example, for a
32- Ω load, the maximum peak output voltage with V
DD
= 1.6 V is approximately 0.7 V with no clipping distortion.
This reduced voltage swing effectively reduces the maximum undistorted output power.
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