參數(shù)資料
型號(hào): TDA8925ST
廠商: NXP SEMICONDUCTORS
元件分類: 音頻/視頻放大
英文描述: Power stage 2 x 15 to 25Wclass-D audio amplifier
中文描述: 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM17
封裝: PLASTIC, SOT-577-2, DIL-BENT-SIL, 17 PIN
文件頁(yè)數(shù): 12/23頁(yè)
文件大?。?/td> 214K
代理商: TDA8925ST
2004 May 06
12
Philips Semiconductors
Product specification
Power stage 2 x 15 to 25 W class-D
audio amplifier
TDA8925
15.1
SE application
For SE application the application diagram as shown in Fig.5 can be used.
15.2
Package ground connection
The heatsink of the TDA8925 is connected internally to V
SS
.
15.3
Output power
The output power in SE self oscillating class-D applications can be estimated using the formula
R
R
R
+
+
R
L
×
The maximum current
should not exceed 3 A.
Where:
R
L
= load impedance
R
s
= series resistance of filter coil
P
o(1%)
= output power just at clipping.
The output power at THD = 10 %: P
o(10%)
= 1.25
×
P
o(1%)
.
15.4
Reference design
The reference design for a self oscillating class-D system for the TDA8925 is shown in Fig.5. The Printed-Circuit
Board (PCB) layout is shown in Figs 6, 7 and 8. The bill of materials is given in Section 15.5.1.
P
o(1%)
R
-----------------------2
V
P
×
2
=
I
O(max)
V
R
L
R
ds(on)
R
s
+
+
-------------------------------------------
=
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