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參數(shù)資料
| 型號： | TDA8939TH |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Zero dead time Class-D 7.5 A power comparator |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封裝： | PLASTIC, SOT-566-3, HSOP-24 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大小： | 99K |
| 代理商： | TDA8939TH |
9397 750 13023
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 01 — 22 April 2004
12 of 21
Philips Semiconductors
TDA8939
Zero dead time Class-D 7.5 A power comparator
13. Output power estimation
The maximum achievable output power is not only determined by the power comparator
characteristics, but by the total system application.
The following application blocks determine the maximum achievable output power:
Power comparator:
Minimum pulse width
Series resistances: R
DS_ON
, bond wires, printed-circuit board tracks, series resistance
of the coil, etc.
System application:
Power supply voltage
Load impedance
Controller characteristics: maximum modulation depth and carrier frequency.
In
Figure 6
an estimate is given for the output power in full-bridge application as function
of the (symmetrical) supply voltage for different values of the load-impedance. The
following variables are taken into account:
Minimum pulse width: 150 ns
Total series resistance: 0.4
Carrier frequency: 384 kHz.
(1) Z
L
= 4
.
(2) Z
L
= 6
.
(3) Z
L
= 8
.
Fig 6.
Output power estimation as a function of
(symmetrical) supply voltage for THD = 1 %.
(1) Z
L
= 4
.
(2) Z
L
= 6
.
(3) Z
L
= 8
.
Fig 7.
Output power estimation as a function of
(symmetrical) supply voltage for THD = 10 %.
V
P
(V)
10
30
26
18
22
14
001aaa626
80
120
40
160
200
P
out
(W)
0
(1)
(2)
(3)
V
P
(V)
10
30
26
18
22
14
001aaa627
100
150
50
200
250
P
out
(W)
0
(1)
(2)
(3)
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