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參數資料
| 型號： | TPA3005D2PHPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封裝： | GREEN, PLASTIC, HTQFP-48 |
| 文件頁數： | 9/30頁 |
| 文件大?。?/td> | 643K |
| 代理商： | TPA3005D2PHPRG4 |
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SLOS427A – MAY 2004 – REVISED AUGUST 2010
VCLAMP Capacitors
To ensure that the maximum gate-to-source voltage for the NMOS output transistors is not exceeded, two
internal regulators clamp the gate voltage. Two 1-F capacitors must be connected from VCLAMPL (pin 25) and
VCLAMPR (pin 36) to ground and must be rated for at least 25 V. The voltages at the VCLAMP terminals vary
with VCC and may not be used for powering any other circuitry.
Internal Regulated 5-V Supply (AVDD)
The AVDD terminal (pin 29) is the output of an internally-generated 5-V supply, used for the oscillator,
preamplifier, and volume control circuitry. It requires a 1-F capacitor, placed close to the pin, to keep the
regulator stable.
This regulated voltage can be used to control GAIN0 and GAIN1 terminals, but should not be used to drive
external circuitry.
Differential Input
The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel. To
use the TPA3005D2 with a differential source, connect the positive lead of the audio source to the INP input and
the negative lead from the audio source to the INN input. To use the TPA3005D2 with a single-ended source, ac
ground the INP or INN input through a capacitor equal in value to the input capacitor on INN or INP and apply
the audio source to either input. In a single-ended input application, the unused input should be ac-grounded at
the audio source instead of at the device input for best noise performance.
SHUTDOWN OPERATION
The TPA3005D2 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 trip point) 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-off pop performance, place the amplifier in the shutdown mode prior to removing the power
supply voltage.
USING LOW-ESR CAPACITORS
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.
SHORT-CIRCUIT PROTECTION
The TPA3005D2 has short-circuit protection circuitry on the outputs that prevents damage to the device during
output-to-output shorts, output-to-GND shorts, and output-to-VCC shorts. When a short-circuit is detected on the
outputs, the part immediately disables the output drive. This is a latched fault and must be reset by cycling the
voltage on the SHUTDOWN pin to a logic low and back to the logic high state for normal operation. This clears
the short-circuit flag and allow for normal operation if the short was removed. If the short was not removed, the
protection circuitry again activates.
THERMAL PROTECTION
Thermal protection on the TPA3005D2 prevents damage to the device when the internal die temperature
exceeds 150°C. There is a ±15 degree 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
20°C. The device begins normal operation at this point with no external system interaction.
PRINTED-CIRCUIT BOARD (PCB) LAYOUT
Because the TPA3005D2 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.
Copyright 2004–2010, Texas Instruments Incorporated
17
Product Folder Link(s): TPA3005D2
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