TDF8599 NXP Semiconductors, TDF8599 Datasheet - Page 35

• Manufacturer Part Number: TDF8599
• Description: I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier
• Manufacturer: NXP Semiconductors

w
w
NXP Semiconductors
TDF8599_1
Product data sheet
Fig 29. P
w
(W)
P
(1) R
(2) R
(3) R
(4) R
.
160
120
o
80
40
0
D
8
THD = 0.5 %.
t
THD = 0.5 %
W(min)
DSon
L
L
L
o
= 1 .
= 2 .
= 4 .
a
as a function of V
= 0.06
= 130 ns and I
14.2 Output power estimation (Parallel mode)
14.3 Output current limiting
t
10
a
S
(at T
Figure 29
THD = 10 % as a function of the supply voltage for different load impedances in parallel
mode.
The peak output current is internally limited to 8 A maximum. During normal operation, the
output current should not exceed this threshold level otherwise the output signal will be
distorted. The peak output current can be estimated using the following equation:
Example: A 1
is triggered.
Current limiting (clipping) avoids audio holes but can cause distortion similar to voltage
clipping. In Parallel mode, the output current is internally limited above 16 A.
I
12
o
•
•
•
•
•
h
j
O(ocp)
= 25 C), R
I
V
R
R
R
----------------------------------------------------- -
R
o
P
e
L
DSon
S
L
= output current (A)
p
= supply voltage (V)
= load impedance ( )
= series resistance output inductor ( )
+
14
in parallel mode with
= 16 A (minimum).
e
2
and
= on-resistance power switch ( )
t
S
V
R
= 0.0125 ,
Figure 30
p
4
RSon
16
speaker can be used with a supply voltage of 11 V before current limiting
001aai798
(1)
(2)
(3)
V
U
P
+
(V)
Rev. 01 — 13 November 2008
R
.
18
S
c
show the estimated output power at THD = 0.5 % and
8 A
o
m
Fig 30. P
(W)
P
(1) R
(2) R
(3) R
(4) R
160
o
120
Class-D power amplifier with load diagnostics
80
40
0
8
THD = 10 %.
t
THD = 10 %
W(min)
DSon
L
L
L
o
= 1 .
= 2 .
= 4 .
as a function of V
= 0.06
= 130 ns and I
10
(at T
12
j
O(ocp)
= 25 C), R
p
14
parallel mode with
= 16 A (minimum).
S
TDF8599
= 0.0125 ,
© NXP B.V. 2008. All rights reserved.
16
001aai799
(1)
(2)
(3)
V
P
(V)
18
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