參數(shù)資料
型號: 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
文件頁數(shù): 20/31頁
文件大小: 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
20 of 31
Philips Semiconductors
TDA8931
Power comparator 1
×
20 W
To estimate the power dissipation, the following equation can be used:
(6)
Where:
P
d
= power dissipation
P
o
= RMS output power (W)
η
= efficiency of total application (0.91 for R
L
= 8
and 0.89 for R
L
= 4
)
The derating curves of the dissipated power as a function of ambient temperature for
several values of R
th(j-a)
are illustrated in
Figure 9
. A maximum junction temperature
T
j
= 150
°
C is taken into account.
Example:
TDA8931T mono amplifier, with substituting P
o
= 1
×
20 W, R
th(j-a)
= 24 K/W,
P
d
= 2.47 W results in a junction temperature T
j(max)
= 119
°
C.
For this example the estimated maximum junction temperature at a high ambient
temperature of 60
°
C for a mono amplifier driving 4
speaker impedance stays below the
OTP threshold level of 150
°
C.
Fig 9.
Derating curves for power dissipation as a function of maximum ambient
temperature
P
d
P
o
1
η
---
1
×
=
001aac303
T
amb
(
°
C)
25
100
75
50
4
2
6
8
P
d
(W)
0
35
40
20
R
th(j-a)
(K/W)
25
30
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