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参数资料
| 型号： | TDA8920TH/N1,118 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 80 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封装： | PLASTIC, SOT-566-3, HSOP-24 |
| 文件页数： | 8/36页 |
| 文件大小： | 733K |
| 代理商： | TDA8920TH/N1,118 |
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2002 Sep 25
16
Philips Semiconductors
Product specication
2
× 80 W class-D power amplier
TDA8920
16 APPLICATION INFORMATION
16.1
BTL application
When using the system in the mono BTL application (for
more output power), the inputs of both channels must be
connected in parallel; the phase of one of the inputs must
be inverted; see Fig.5. In principle the loudspeaker can be
connected between the outputs of the two single-ended
demodulation filters.
16.2
MODE pin
For correct operation the switching voltage at the mode pin
should be debounced. If the mode pin is driven by a
mechanical switch an appropriate debouncing low-pass
filter should be used. If the mode pin is driven by an
electronic circuit or microcontroller then it should remain at
the mute voltage level for at least 100 ms before switching
back to the standby voltage level.
16.3
Output power estimation
The output power in several applications (SE and BTL)
can be estimated using the following expressions:
SE:
Maximum current:
should not exceed 7.5 A.
BTL:
Maximum current:
should not exceed 7.5 A.
Legend:
RL = load impedance
fosc = oscillator frequency
tmin = minimum pulse width (typical 190 ns)
VP = single-sided supply voltage (so if supply ±30 V
symmetrical
→ VP =30V)
Pout_1% = output power just at clipping
Pout_10% = output power at THD = 10%
Pout_10% = 1.25 × Pout_1%.
16.4
External clock
The minimum required symmetrical supply voltage for
external clock application is
±15 V (equally the minimum
asymmetrical supply for applications with an external clock
is 30 V).
When using an external clock the following accuracy of the
duty cycle of the external clock has to be taken into
account; 47.5% < DC, external clock < 52.5%.
A possible solution for an external clock oscillator circuit is
illustrated in Fig.7.
P
out_1%
R
L
R
L
0.6
+
---------------------
V
P
1t
min
f
osc
×
–
()
×
2
2R
L
×
------------------------------------------------------------------------------------------
=
I
out^
V
P
1t
min
f
osc
×
–
()
×
R
L
0.6
+
-----------------------------------------------------
=
P
out_1%
R
L
R
L
1.2
+
---------------------
2V
P
1t
min
f
osc
×
–
()
×
2
2R
L
×
---------------------------------------------------------------------------------------------
=
I
out^
2V
P
1t
min
f
osc
×
–
()
×
R
L
1.2
+
---------------------------------------------------------
=
handbook, full pagewidth
1
14
7
2
11
13
10
4
5
6
89
12
3
CTC
0
0
+
ASTAB
ASTAB
+
TRIGGER
+TRIGGER
RETRIGGER
MR
220
nF
5.6 V
4.3 V
HOP
GND
MBL468
HEF4047BT
VDD
360 kHz
320 kHz
VDDA
VSS
9.1 k
2 k
120 pF
RTC
CLOCK
RCTC
Fig.7 External oscillator circuit.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA8922 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:2 x 25 W class-D power amplifier |
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| TDA8922BJ/N2,112 | 功能描述:音频放大器 2X50W CLASSD PWR AMP RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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