TFA9810 Datasheet, PDF (18/29 Pages) NXP Semiconductors – Stereo full-bridge audio amplifier 2 x 12 W

NXP Semiconductors
TFA9810
Audio amplifier 2 x 12 W
Table 11. AC characteristics measured in typical application …continued
T_amb = 25 °C; V_P = 12 V; R_L = 8 Ω; f_osc = 550 kHz; Figure 33 unless otherwise specified.
Symbol Parameter
Conditions
Min
Typ
THD+N
total harmonic
P_o is 1 W; f = 1 kHz; AES17
distortion-plus-noise brick-wall filter
-
0.04
η_po
output power
P_o = 9 W
efficiency
87
89
G_v(cl)
closed-loop voltage V_I = 100 mV (RMS); f_i = 1 kHz
19
19.7
gain
V_n(o)
noise output voltage Inputs shorted;
AES17 brick-wall filter
-
150
S/N
signal-to-noise ratio V_o = 10 V(RMS); gain 20 dB
-
96
SVRR
supply voltage ripple V_ripple = 2 Vpp; f_I= 1kHz
[1]
34
45
rejection
α_cs
channel separation P_o = 1 W; f_i = 1 kHz
55
70
[1] Minimum value determined by R5, R10, R17, R22 equalling +1 % and R7, R14, R18, R20 equalling −1 %.
Max
0.1
-
21
-
-
-
-
Unit
%
%
dB
µV
dB
dB
dB
13. Quality specification
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.
14. Application information
14.1 Output power estimation
For BTL configuration the output power just before clipping can be estimated using
Equation 1:
BTL : P_{o0.5 %} = -------^R--------^L--------⁺---------^{2----------×---------(}----^R-^R-----₂-^L--D------_×^-S-----^o----_R^--n------_L^-+----------^R--------^s-----⁾------^×-----^V----^P------²
(1)
Where,
• V_P = supply voltage (V_DDPx − V_SSPx) [V]
• R_L = load resistance [Ω]
• R_DSon = drain-source on-state resistance [Ω]
• R_s = series resistance [Ω]
• P_{o0.5 %} = output power at the THD level of 0.5 % [W]
The output power at 10 % THD can be estimated by using Equation 2:
P_{o10 %} = 1.25 × P_{o0.5 %}
(2)
Figure 26 and Figure 27 below show the estimated output power at THD = 0.5 % and
THD = 10 % as a function of the BLT supply voltage for different load impedances.
TFA9810_2
Preliminary data sheet
Rev. 02 — 30 August 2007
© NXP B.V. 2007. All rights reserved.
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