參數(shù)資料
型號(hào): TDA8931
廠商: NXP Semiconductors N.V.
英文描述: Power comparator 1 X 20 W
中文描述: 功率比較1 × 20瓦
文件頁(yè)數(shù): 17/31頁(yè)
文件大?。?/td> 165K
代理商: TDA8931
9397 750 13847
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Preliminary data sheet
Rev. 01 — 14 January 2004
17 of 31
Philips Semiconductors
TDA8931
Power comparator 1
×
20 W
14.1 Output power estimation
The output power, just before clipping, can be estimated using the following equation:
(2)
Where:
P
o(1%)
= output power just before clipping at THD = 1 %
R
L
= load impedance
R
DSon
= on-resistance power switch
R
coil
= series resistance output coil
R
ESR
= ESR of the single-ended capacitor
V
P
= supply voltage (V
DDP
V
SSP
)
Example:
Substituting R
L
= 4
, R
DSon
= 0.22
(at T
j
= 25
°
C), R
coil
= 0.045
,
R
ESR
= 0.06
and V
P
= 22 V results in output power P
o
= 12.9 W.
The output power at THD = 10 % can be estimated by:
(3)
Figure 6
shows the estimated output power as a function of the supply voltage for different
load impedances.
P
o 1
%
(
)
R
8
-------------------------------------------------------------------------------------
×
----------------------------------------------------------------
V
P
×
2
R
L
=
P
o 10
%
)
1.25
P
o 1
%
(
)
×
=
a. THD = 1 %.
b. THD = 10 %.
Fig 6.
Output power as a function of supply voltage
V
P
(V)
10
35
30
20
15
25
001aac236
10
20
30
P
O
(W)
0
R
L
=
3
4
6
8
10
V
P
(V)
10
35
30
20
15
25
001aac237
10
20
30
P
O
(W)
0
R
L
=
3
4
6
8
10
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