TFA9810 NXP Semiconductors, TFA9810 Datasheet - Page 18

• Manufacturer Part Number: TFA9810
• Description: The TFA9810 is a two-channel power comparator for high-efficiency class D audioamplifier systems
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 11.
T
[1]
13. Quality specification
14. Application information
TFA9810_3
Product data sheet
Symbol
S/N
SVRR
amb
cs
Minimum value determined by R5, R10, R17, R22 equalling +1 % and R7, R14, R18, R20 equalling 1 %.
= 25 C; V
AC characteristics measured in typical application
Parameter
signal-to-noise ratio
supply voltage ripple
rejection
channel separation
P
14.1 Output power estimation
= 12 V; R
In accordance with SNW-FQ-611-E, ‘if this type is used as an audio amplifier’. The
number of the quality specification can be found in the Quality Reference Handbook. The
handbook can be ordered using the code 9398 510 63011.
For BTL configuration the output power just before clipping can be estimated using
Equation
Where,
The output power at 10 % THD can be estimated by using
Figure 26
THD = 10 % as a function of the BLT supply voltage for different load impedances.
P
L
•
•
•
•
•
o
BTL : P
10 %
= 8
V
R
R
R
P
P
o0.5 %
L
DSon
s
= supply voltage (V
= series resistance [ ]
= load resistance [ ]
=
f
1:
osc
o
1.25 P
and
= drain-source on-state resistance [ ]
0.5 %
= output power at the THD level of 0.5 % [W]
Conditions
V
V
P
= 550 kHz;
o
ripple
o
= 10 V (RMS); gain 20 dB
= 1 W; f
Figure 27
=
= 2 V
o
-------------------------------------------------------------------------------- -
0.5 %
----------------------------------------------------- -
R
Rev. 03 — 20 February 2008
i
L
(p-p)
= 1 kHz
Figure 33
+
below show the estimated output power at THD = 0.5 % and
; f
2
DDPx
i
= 1 kHz
R
R
2
L
DSon
unless otherwise specified.
V
R
SSPx
L
+
…continued
R
) [V]
s
V
[1]
P
Min
-
34
55
2
Equation
Typ
96
45
70
Audio amplifier 2 x 12 W
2:
Max
-
-
-
© NXP B.V. 2008. All rights reserved.
TFA9810
Unit
dB
dB
dB
18 of 29
(1)
(2)