Tfa9810, Nxp semiconductors – NXP Semiconductors TFA9810 User Manual
Page 17
TFA9810_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 20 February 2008
17 of 29
NXP Semiconductors
TFA9810
Audio amplifier 2 x 12 W
[1]
High-side and low-side power switch have the same series resistance.
[2]
Output power measured across the loudspeaker load. Output power is measured indirectly via R
DSon
.
12.3 AC characteristics measured in a typical application
t
resp
response time
transition PWM output from
LOW to HIGH
V
I
= 70 mV
V
I
= 3.3 V
-
-
60
50
-
-
ns
ns
transition PWM output from
HIGH to LOW
V
I
= 70 mV
V
I
= 3.3 V
-
-
60
50
-
-
ns
ns
t
w(min)
minimum pulse width
PWM output
-
60
-
ns
R
DSon
drain-source on-state
resistance
-
0.28
0.35
Ω
η
po
output power
efficiency
output power 2 x 9 W into 8
Ω
.
P
o
= P
o(nom)
87
89
-
%
Table 10.
Dynamic characteristics
…continued
T
amb
= 25
°
C; V
P
= 12 V; R
L
= 8
Ω
;
Figure 33
unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Table 11.
AC characteristics measured in typical application
T
amb
= 25
°
C; V
P
= 12 V; R
L
= 8
Ω;
f
osc
= 550 kHz;
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V
P
supply voltage
V
P
= V
DDPx
−
V
SSPx
8
12
20
V
P
o(RMS)
RMS output power
R
L
= 8
Ω
; V
P
= 12 V;
THD = 10 %; Two channel
driven; no heat sink required.
-
9.5
-
W
P
o
output power
V
P
= 12 V; R
L
= 8
Ω
THD = 10 %
8.5
9.5
-
W
THD = 1 %
6.5
7.5
-
W
V
P
= 14 V; R
L
= 8
Ω
;
THD = 10 %; thermally limited
-
12
-
W
V
P
= 16 V; R
L
= 8
Ω
;
THD = 10 %; thermally limited
-
15
-
W
V
P
= 12 V; R
L
= 6
Ω
;
THD = 10 %; thermally limited
-
12
-
W
V
P
= 12 V; R
L
= 4
Ω
;
THD = 10 %; thermally limited
-
15
-
W
THD+N
total harmonic
distortion-plus-noise
P
o
is 1 W; f = 1 kHz; AES17
brick-wall filter
-
0.04
0.1
%
η
po
output power
efficiency
P
o
= 9 W
87
89
-
%
G
v(cl)
closed-loop voltage
gain
V
I
= 100 mV (RMS); f
i
= 1 kHz
19
19.7
21
dB
V
n(o)
output noise voltage
Inputs shorted;
AES17 brick-wall filter
-
150
-
µ
V