Texas Instruments TPA3121D2, Руководство пользователя, Страница: 3 / 9

1.2 TPA3121D2 EVM Specifications
2 Operation
2.1 Quick Start List for Stand-Alone Operation
2.1.1 Power Supply
2.1.2 Evaluation Module Preparations
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Operation
V
CC
Supply voltage range 10V to 26V
I
CC
Supply current 3A max
P
O
Continuous output power per channel: 8
Ω
, VCC = 24 V, THD+N = 10% 10 W
R
L
Minimum load impedance 6
Ω
Follow these steps to use the TPA3121D2EVM stand-alone or when connecting it into existing circuits or
equipment. Connections to the EVM module can be made by inserting stripped wire or using banana
plugs for the power supply and output connections. The inputs accept standard RCA plugs.
1. Ensure that all external power sources are set to OFF.
2. Connect an external regulated power supply adjusted from 10V–26V to the module VCC (J7) and GND
(J8) banana jacks taking care to observe marked polarity.
Inputs and Outputs
1. Connect a speaker across GND ( J5 ) and +ROUT ( J6 ). Connect another speaker across LOUT ( J3 )
and GND ( J4 )
2. Install both gain jumpers GAIN0 ( J1 ) and GAIN1 ( J2 ). This will set the gain of the amplifier to the
lowest level, 20dB.
Control Inputs
1. SHUTDOWN : This terminal is active LOW. A LOW on the device terminal (<0.8V) shuts down the
amplifier; a HIGH (>2V) on the device terminal places the amplifier in the active state. Holding down
switch
SW1 will place the amplifier in the SHUTDOWN state. Releasing SW1 will return the amplifier to
the active state. This terminal is Vcc compliant.
2. MUTE : This terminal is active HIGH. A HIGH (>2V) on this terminal will immediately terminate audio
playback through the speakers; a LOW (<0.8V) will enable the device. The outputs will remain
switching with fifty percent duty cycle.
SW2 on the EVM controls the state of the MUTE terminal.
Holding down switch SW2 will place the amplifier in the MUTE state. Releasing SW2 will return the
amplifier to the active state. This terminal is Vcc compliant.
3. GAIN0/GAIN1 : Together, these terminals determine the gain of the amplifier. Refer to Table 1 below.
Installing a jumper in J1 or J2 will set the respective terminal to GND. Removing the jumper will set the
respective terminals to VCC. Removing jumpers will INCREASE the gain while installing jumpers will
DECREASE the gain. Logic levels are TTL compatible. These terminals are Vcc compliant
Table 1. Gain Settings
(1)
GAIN0 (J1) GAIN1 (J2) Amplifier Gain (dB)
ON ON 20
ON OFF 26
OFF ON 32
OFF OFF 36
(1)
OFF = Jumper REMOVED; ON = Jumper INSTALLED
SLOU221 – June 2008 TPA3121D2 Audio Power Amplifier Evaluation Module 3
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