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參數(shù)資料
| 型號： | ZXCD1010EQ16 |
| 廠商： | ZETEX PLC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | HIGH FIDELITY CLASS D AUDIO AMPLIFIER SOLUTION |
| 中文描述： | 2 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| 封裝： | QSOP-16 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 555K |
| 代理商： | ZXCD1010EQ16 |
Class D 25W Mono Open Loop (Bridge Tied Load - BTL) Solution – Circuit Description
Proprietary circuit design and high quality magnetics
are necessary to yield the high THD performance
specified. Deviation from the Zetex recommended
solution could significantly degrade performance.
The speaker is connected as a Bridge Tied Load (BTL).
This means that both sides of the speaker are driven
from theoutputbridgeand thereforeneithersideofthe
speaker connects to ground. This allows maximum
power to be delivered to the load, from a given supply
voltage.
The supply voltage for this solution is
nominally 16V for 25W into a 4
load.
A schematic diagram for the solution is shown in
Figure4.Theaudio inputis AC coupled and applied to a
low pass filter and a phase splitter built around the
NE5532 dual 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 ZXCD1010. The
op-amp outputs are AC coupled into the ZXCD1010
Audio A and Audio B inputs via simple R-C low pass
filters (R16/C3 and R15/C7). The op-amps are biased to
a DC level of approximately 6V by R11 and R12.
The Pulse Width Modulated (PWM) outputs, OutA and
OutB, which contain the audio information, are AC
coupled and DC restored before driving the Zetex
ZX M64P03X and ZX M64N03X PMOS and NMOS
output bridge FET’s. AC coupling is via C17, C18, C19
and C20. DC restoration is provided by the D2(A1a)/R4,
D1(A4a)/R2 and D3(A1a)/R6, D4(A4a)/R9 components.
This technique allows the output stage supply voltage
to be higher than the high level of the OutA and OutB
outputs (approximately 8.5V),
almost the full output voltage swing to the gates of the
bridge FET’s (thereby ensuring good turn on). This can
be exploited to yield higher power solutions with
higher supply voltages – this is discussed later.
whilst still supplying
The resistor/diode combinations (R5/D2(A16b),
R3/D1(A4b), R7/D3(A1b) and R8/D4(A4b)) in series with
the bridge FET gates, assistin controlling the switching
of the bridge FET’s. This design minimises shoot
through currents whilst still achieving the low
distortion characteristics of the system.
The purpose of the special inductors in conjunction
with the output capacitors C23, C24, C25 and C26 is to
low pass filter the high frequency switching PWM
signal that comes from the bridge. Thus the lower
frequency audio signal is recovered and is available at
the speakerA and speakerB outputs across which the
speakershouldbeconnected.Zetex canofferadviceon
suitable source for the specialist magnetics.
The optional components R17 and C3 form a Zobel
network. The applicability of these depends upon the
application and speaker characteristics. Suggested
values are 47nF and 10 ohms
Efficiency
Figure 5 shows the measured efficiency of the Zetex
solution at various power levels into both 4
and 8
loads. As a comparison, typical efficiency is plotted for
a class A-B amplifier. They clearly demonstrate the
majorefficiency benefits available from the Zetex class
D solution.
ZXCD1010
S E M IC O N D U C T O R S
ISSUE 3 - NOVEMBER 2003
7
Figure 5
Output Stage Efficiency v Power with 4
and 8
loads
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