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| 型號： | ZXCD1000EQ16TA |
| 英文描述： | Consumer IC |
| 中文描述： | 消費(fèi)性IC |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 1756K |
| 代理商： | ZXCD1000EQ16TA |
ISSUE 1 -MARCH 2001
ZXCD1000
11
Class D 25W Mono Bridge Tied Load
(BTL) Solution with Feedback
–
Circuit Description
With the addition of feedback (hence closed loop
solution) it is possible to obtain even better THD
performance. A schematic diagram for this is shown in
Figure 9. Again proprietary circuit and special magnetic
design is necessary to yield the high THD performance
and deviation from this could significantly reduce
performance.
Much of the circuitry is the same as described for the
open loop solution. The main differences being a
consequence of using the feedback circuitry. The input
and feedback circuitry is shown separately in Figure 10
and is now described. The audio input is ac coupled and
applied to an op-amp (1/2 of RC4558D) configured as a
non
–
inverting amplifier with a gain of approximately
2.8. The op-amp input is tied to a DC level of
approximately VCC/2. Feedback is applied differentially
from the bridge outputs via the other half of the
RC4558D op-amp. A portion of the single ended output
from this op-amp is subtracted from the output of the
non-inverting op-amp output above. Overall negative
feedbackisappliedduetothepolarityandconnectionof
the signals involved.
The audio signal from the above circuitry is applied to a
phase splitter (see Figure 11) as was done for the open
loopsolution.ThisisbuiltaroundtheotherLM3580dual
op-amp. One of these op-amps is configured as a
voltage follower and the other as a X1 inverting
amplifier. This produces in phase and inverted signals
for application to the ZXCD1000 Audio A and Audio B
inputs respectively.
The output circuitry downstream of the ZXCD1000 is as
described for the open loop solution, but the
components may be slightly different (and have
different numbering).
Higher Power Solutions
With some modifications the applications solutions
can be extended to give 50W or even higher output
powers. A 50W solution can be implemented with a
circuit very similar to the 25W solution. The main
differences being the supply voltage and the output
magnetics. The magnetics for 50W are necessarily
larger than required for 25W in order to handle the
higher load currents. For 50W operation the supply
voltage to the circuit is nominally 25V. However the
maximum supply voltage to the ZXCD1000 class D
controller IC is 20V, hence a voltage dropper is
required. This could be done, for example, as in the
open loop solution described previously. In addition,
for the closed loop solution, slightly modified
feedback resistor ratios are required.
The ZXCD1000 class D controller IC is inherently
capable of driving even higher power solutions, with
the appropriate external circuitry. However as stated
above the maximum supply voltage to the ZXCD1000
class D controller IC is 20V and the higher supply
voltages must therefore be dropped. Also due
consideration must be given to the ZXCD1000 output
drive levels and the characteristics of the bridge
MOSFET
’
s. The latter must be sufficiently enhanced
by the OutA and OutB outputs to ensure the filter and
loadnetworkisdrivenproperly.Ifthegatedriveofthe
ZXCD1000istoolowforthechosenMOSFETthenthe
OUTA and OUTB signal must be buffered using an
appropriate MOSFET driver circuit. Additionally,
suitablemagneticsareessentialtoachievegoodTHD
performance.
Package details
The ZXCD1000 is available in a 16 pin eQSOP
package. The exposed pad on the underside of the
package should be soldered down to an area of
copper on the PCB, to function as a heatsink. The PCB
should have plated through vias to the underside of
the board, again connecting to an area of copper.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZXCD1000EQ16TC | 功能描述:音頻放大器 Class D Cont IC 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 |
| ZXCD1000MOKIT | 功能描述:器件套件 ZXCD mono Kit RoHS:否 制造商:AVX 零部件類型: |
| ZXCD1000STKIT | 功能描述:器件套件 ZXCD mono Kit RoHS:否 制造商:AVX 零部件類型: |
| ZXCD100MOEVAL | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:100W CLASS D AUDIO AMPLIFIER EVALUATION BOARD |
| ZXCD1010 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:HIGH FIDELITY CLASS D AUDIO AMPLIFIER SOLUTION |
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