參數(shù)資料
型號(hào)： TPA3106D1VFPRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 40 W, 1 CHANNEL, AUDIO AMPLIFIER, PQFP32
封裝： 7 X 7 MM, GREEN, PLASTIC, HLQFP-32
文件頁(yè)數(shù)： 13/35頁(yè)
文件大?。?/td> 1250K
代理商： TPA3106D1VFPRG4
www.ti.com
Power Supply Decoupling, CS
VCLAMP Capacitors
Internal Regulated 4-V Supply (VREG)
VBYP Capacitor Selection
SLOS516B – OCTOBER 2007 – REVISED MARCH 2007
The TPA3106D1 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling
to ensure that the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also
prevents oscillations for long lead lengths between the amplifier and the speaker. The optimum decoupling is
achieved by using two capacitors of different types that target different types of noise on the power supply leads.
For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR)
ceramic capacitor, typically 0.1
F to 1 F placed as close as possible to the device V
CC lead works best. For
filtering lower frequency noise signals, a larger aluminum electrolytic capacitor of 100
F per input lines (Pins 14,
15 and pins 26, 27, 28) or greater placed near the audio power amplifier is recommended. The 100
F capacitor
also serves as local storage capacitor for supplying current during large signal transients on the amplifier outputs.
The PVCC terminals provide the power to the output transistors, so a 100 F or larger capacitor should be
placed on each PVCC terminal. A 10 F capacitor on the AVCC terminal is adequate.
The full H-bridge output stages use only NMOS transistors. Therefore, they require bootstrap capacitors for the
high side of each output to turn on correctly. A 220-nF ceramic capacitor, rated for at least 25 V, must be
connected from each output to its corresponding bootstrap input. Specifically, one 220-nF capacitor must be
connected from xOUTP to BSxx, and one 220-nF capacitor must be connected from xOUTN to BSxx. (See the
application circuit diagram in Figure 25.)
The bootstrap capacitors connected between the BSxx pins and corresponding output function as a floating
power supply for the high-side N-channel power MOSFET gate drive circuitry. During each high-side switching
cycle, the bootstrap capacitors hold the gate-to-source voltage high enough to keep the high-side MOSFETs
turned on.
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 and
VCLAMPR to ground and must be rated for at least 16 V. The voltages at the VCLAMPx terminals may vary with
VCC and may not be used for powering any other circuitry.
The VREG terminal (pin 10) is the output of an internally generated 4-V supply, used for the oscillator,
preamplifier, and gain control circuitry. It requires a 10-nF capacitor, placed close to the pin, to keep the regulator
stable.
This regulated voltage can be used to control GAIN0, GAIN1, MSTR/SLV, and MUTE terminals, but should not
be used to drive external circuitry.
The internal bias generator (VBYP) nominally provides a 1.25-V internal bias for the preamplifier stages. The
external input capacitors and this internal reference allow the inputs to be biased within the optimal
common-mode range of the input preamplifiers.
The selection of the capacitor value on the VBYP terminal is critical for achieving the best device performance.
During power up or recovery from the shutdown state, the VBYP capacitor determines the rate at which the
amplifier starts up. When the voltage on the VBYP capacitor equals VBYP, the device starts a 16.4-ms timer.
When this timer completes, the outputs start switching. The charge rate of the capacitor is calculated using the
standard charging formula for a capacitor, I = C x dV/dT. The charge current is nominally equal to 250A and dV
is equal to VBYP. For example, a 1-F capacitor on VBYP would take 5 ms to reach the value of VBYP and
begin a 16.4-ms count before the outputs turn on. This equates to a turn-on time of <30 ms for a 1-F capacitor
on the VBYP terminal.
A secondary function of the VBYP capacitor is to filter high-frequency noise on the internal 1.25-V bias generator.
A value of at least 0.47F is recommended for the VBYP capacitor. For the best power-up and shutdown pop
performance, the VBYP capacitor should be greater than or equal to the input capacitors.
20
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPA3106D1
相關(guān)PDF資料
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TPA3107D2PAPG4 功能描述:音頻放大器 15W Stereo Class-D Aud Power Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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