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參數(shù)資料
| 型號： | TPA3125D2N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 36 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP20 |
| 封裝： | ROHS COMPLIANT, PLASTIC, DIP-20 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 467K |
| 代理商： | TPA3125D2N |
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SHUTDOWN OPERATION
MUTE Operation
USING LOW-ESR CAPACITORS
SHORT-CIRCUIT PROTECTION
THERMAL PROTECTION
PRINTED-CIRCUIT BOARD (PCB) LAYOUT
www.ti.com ........................................................................................................................................................................................... SLOS611 – DECEMBER 2008
The circuit is designed for a CBYP value of 1 F for best pop performance. The input capacitors should have the
same value. A ceramic or tantalum low-ESR capacitor is recommended.
The TPA3125D2 employs a shutdown mode of operation designed to reduce supply current (ICC) to the absolute
minimum level during periods of nonuse for power conservation. The SHUTDOWN input terminal should be held
high (see specification table for threshold) during normal operation when the amplifier is in use. Pulling
SHUTDOWN low causes the outputs to mute and the amplifier to enter a low-current state. Never leave
SHUTDOWN unconnected, because amplifier operation would be unpredictable.
For the best power-up pop performance, place the amplifier in the shutdown or mute mode prior to applying the
power-supply voltage.
The MUTE pin is an input for controlling the output state of the TPA3125D2. A logic high on this terminal causes
the outputs to switch at a constant 50% duty cycle. A logic low on this pin enables the outputs. This terminal may
be used as a quick disable/enable of outputs when changing channels on a television or transitioning between
different audio sources.
The MUTE terminal should never be left floating. For power conservation, the SHUTDOWN terminal should be
used when the amp will be off for a significant amount of time to reduce the quiescent current to the absolute
minimum level.
Low-ESR capacitors are recommended throughout this application section. A real (as opposed to ideal) 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 TPA3125D2 has short-circuit protection circuitry on the outputs that prevents damage to the device during
output-to-output shorts and output-to-GND shorts after the filter and output capacitor (at the speaker terminal.)
Directly at the device terminals, the protection circuitry prevents damage to device during output-to-output,
output-to-ground, and output-to-supply. When a short circuit is detected on the outputs, the part immediately
disables the output drive. This is an unlatched fault. Normal operation is restored when the fault is removed. The
device will try to restart after a 250 ms delay, so in a true fault condition the 250 msec period of the restart
attempts can be used to confirm the fault is an over-current type.
Thermal protection on the TPA3125D2 prevents damage to the device when the internal die temperature
exceeds 150°C. There is a ±15°C tolerance on this trip point from device to device. Once the die temperature
exceeds the thermal set point, the device enters into the shutdown state and the outputs are disabled. This is not
a latched fault. The thermal fault is cleared once the temperature of the die is reduced by 30°C. The device
begins normal operation at this point with no external system interaction.
Because the TPA3125D2 is a class-D amplifier that switches at a high frequency, the layout of the printed-circuit
board (PCB) should be optimized according to the following guidelines for the best possible performance.
Decoupling capacitors—The high-frequency 0.1-F decoupling capacitors should be placed as close to the
PVCC (pins 1 and 10) and AVCC (pins 16 and 17) terminals as possible. The BYPASS (pin 6) capacitor and
VCLAMP (pin 9) capacitor should also be placed as close to the device as possible. Large (220-
F or
greater) bulk power-supply decoupling capacitors should be placed near the TPA3125D2 on the PVCCL and
PVCCR terminals.
Copyright 2008, Texas Instruments Incorporated
17
Product Folder Link(s): TPA3125D2
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