參數(shù)資料
型號: TDA8926TH
廠商: NXP SEMICONDUCTORS
元件分類: 音頻/視頻放大
英文描述: 50 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24
封裝: PLASTIC, SOT-566-3, HSOP-24
文件頁數(shù): 7/28頁
文件大?。?/td> 233K
代理商: TDA8926TH
2002 Oct 22
15
Philips Semiconductors
Preliminary specication
Power stage 2
× 50 W class-D audio
amplier
TDA8926TH
15.1
BTL application
When using the system in a mono BTL application (for more output power), the inputs of both channels of the PWM
modulator must be connected in parallel; the phase of one of the inputs must be inverted. In principle the loudspeaker
can be connected between the outputs of the two single-ended demodulation filters.
15.2
Package ground connection
The heatsink of the TDA8926TH is connected internally to VSS.
15.3
Output power
The output power in single-ended applications can be estimated using the formula
The maximum current
should not exceed 5 A.
The output power in BTL applications can be estimated using the formula
The maximum current
should not exceed 5 A.
Where:
RL = load impedance
Rs = series resistance of filter coil
Po(1%) = output power just at clipping
The output power at THD = 10%: Po(10%) = 1.25 × Po(1%).
15.4
Reference design
The reference design for a two-chip class-D audio amplifier for TDA8926TH and controller TDA8929T is shown in Fig.7.
P
o(1%)
R
L
R
L
R
ds(on)
R
s
++
()
------------------------------------------------
V
P
1t
W(min)
f
osc
×
()
×
2
2R
L
×
--------------------------------------------------------------------------------------------------------------------------
=
I
O(max)
V
P
1t
W(min)
f
osc
×
()
×
[]
R
L
R
ds(on)
R
s
++
----------------------------------------------------------------
=
P
o(1%)
R
L
R
L
2R
ds(on)
R
s
+
()
×
+
----------------------------------------------------------
2V
P
1t
W(min)
f
osc
×
()
×
2
2R
L
×
----------------------------------------------------------------------------------------------------------------------------------------
=
I
O(max)
2V
P
1t
W(min)
f
osc
×
()
×
[]
R
L
2R
ds(on)
R
s
+
()
×
+
---------------------------------------------------------------------
=
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