SA58631 Datasheet, PDF (13/21 Pages) NXP Semiconductors – 3 W BTL audio amplifier

NXP Semiconductors
SA58631
3 W BTL audio amplifier
14.3 Single-ended application
T_amb = 25 °C; V_CC = 7.5 V; f = 1 kHz; R_L = 8 Ω; G_v = 20 dB; audio band-pass 20 Hz to
20 kHz.
The Single-Ended (SE) application diagram is shown in Figure 20.
C1
R1
1 µF _{11 kΩ}
VI
R2
110 kΩ
IN− ₄
IN+ ₃
SVR ₂
C2
47 µF
MODE
1
6
SA58631
5 ^OUT−
100 nF
C3
470 µF
8 ^OUT+
7
GND
V_CC
100 µF
RL
002aac041
Gain = -^RR----²¹-
Fig 20. SE application circuit configuration
The capacitor value of C3 in combination with the load impedance determines the low
frequency behavior. The total harmonic distortion + noise as a function of frequency was
measured with a low-pass filter of 80 kHz. The value of the capacitor C2 influences the
behavior of the PSRR at low frequencies; increasing the value of C2 increases the
performance of PSRR.
14.4 General remarks
The frequency characteristics can be adapted by connecting a small capacitor across the
feedback resistor. To improve the immunity of HF radiation in radio circuit applications, a
small capacitor can be connected in parallel with the feedback resistor (56 kΩ); this
creates a low-pass filter.
SA58631_2
Product data sheet
Rev. 02 — 12 October 2007
© NXP B.V. 2007. All rights reserved.
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