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TPA6120A2 데이터시트(PDF) 11 Page - Texas Instruments

부품명 TPA6120A2
상세설명  TPA6120A2 High Fidelity Headphone Amplifier
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
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TPA6120A2 데이터시트(HTML) 11 Page - Texas Instruments

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+
RF = 1 kW
VCC+
RI= 1 kW
RO = 39.2 W
RL
VI−
VCC−
VI+
RI = 1 kW
RF = 1 kW
+
RF = 1 kW
VCC+
RI = 1 kW
RO = 39.2 W
RL
VI
VCC−
TPA6120A2
www.ti.com
SLOS431B – MARCH 2004 – REVISED FEBRUARY 2015
Typical Application (continued)
Capacitance at the outputs can cause oscillations. Capacitance from some sources, such as layout, can be
minimized. Other sources, such as those from the load (for example, the inherent capacitance in a pair of
headphones), cannot be easily minimized. In this case, adjustments to RO and/or RF may be necessary.
The series output resistor should be kept at a minimum of 10
Ω; small enough so that the effect on the load is
minimal, but large enough to provide the protection necessary such that the output of the amplifier sees little
capacitance. The value can be increased to provide further isolation, up to 100
Ω. Care should be taken in
selecting the thermal capacity of the output series resistor, as it will create a potential divider with the load and
dissipate power.
The series resistor, RS, should be used for two reasons:
1. It prevents the positive input pin from being exposed to capacitance from the line and source.
2. It prevents the source from seeing the input capacitance of the TPA6120A2.
The 50
Ω resistor was chosen because it provides ample protection without interfering in any noticeable way with
the signal. Not shown is another 50
Ω resistor that can be placed on the source side of RS to ground. In that
capacity, it serves as an impedance match to any 50
Ω source. See Figure 15.
Figure 15. Single-Ended Input With A Noninverting Gain Of –1V/V
Figure 16 shows the TPA6120A2 connected with differential inputs. Differential inputs are useful because they
take the greatest advantage of the high CMRR of the device. The two feedback resistor values must be kept the
same, as do the input resistor values.
Figure 16. Differential Input With A Noninverting Gain Of 2V/V
Special note regarding mono operation:
If both amplifiers are powered on, but only one channel is to be used, the unused amplifier MUST have a
feedback resistor from the output to the negative input. Additionally, the positive input should be grounded as
close to the pin as possible. Terminate the output as close to the output pin as possible with a 25
Ω load to
ground.
These measures should be followed to prevent the unused amplifier from oscillating. If it oscillates, and the
power pins of both amplifiers are tied together, the performance of the amplifier could be seriously degraded.
Copyright © 2004–2015, Texas Instruments Incorporated
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