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LA4632 Datasheet(Fiches technique) 4 Page - Sanyo Semicon Device

Numéro de pièce LA4632
Description  10 W Two-Channel BTL AF Power Amplifier for Audio Applications
Télécharger  8 Pages
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Fabricant  SANYO [Sanyo Semicon Device]
Site Internet  http://www.ssdc-jp.com/eng/
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 4 page
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No.8178-4/8
LA4632
Application Circuit Example/Test Circuit Diagram
+
RF
+
IN1
+
IN2
+
MUTE
PWR
GND
+OUT2
--OUT2
--OUT1
STBY
VCC
VCC
PRE
GND
+
+OUT1
LA4632
1
2
3
4
5
6
7
10
11
12
RL
RL
8
9
Top view
• Caution
Although the LA4632 is basically pin compatible with the LA4631, there are certain differences in the external
components and the way the devices are used.
External Components and Usage Notes
C1, C2: These are input coupling capacitors; we recommend a value of 4.7 µF or lower. A zero bias type circuit is
used for the LA4632 input circuits, and the input pin potential is close to zero volts. Therefore the polarity
must be considered in conjunction with the DC potential of the circuit connected to the LA4632 front end.
If there is a large potential difference between the plus and minus sides of the input capacitors, the
stabilization time when power is first applied can be reduced by reducing the value of the input
capacitors, as long as that reduction does not compromise the low-band characteristics.
C3:
This capacitor is used both as a ripple filter and to set the amplifier's startup time. A value of 47 µF is
recommended. With this value, the startup time (the time from the point power is first applied until the
point an output is generated) will be about 0.6 to 0.7 seconds. (See note 1.)
C4, R1: This RC circuit is used for mute smoothing. C4 is required even if the muting function is not used. (See
note 2.)
C5:
Power supply capacitor
C6 to C9, R2 to R5: These components form oscillation prevention RC circuits. We recommend using polyester
film capacitors (Mylar capacitors) with excellent thermal characteristics for C6 through C9. (R2 to R5 are
2.2
Ω 1/4 W resistors.)
*1. Startup time
The LA4632 features a built-in startup circuit that can be adjusted somewhat by changing the value of the capacitor
connected to pin 1. (With the recommended value of 47 µF, the time is about 0.6 to 0.7 seconds (a time that changes
somewhat with VCC). That time can be extended to about 0.8 to 0.9 seconds by inserting a capacitor with a value of
10 µF in parallel.) Since using a capacitor with a value smaller than the recommended value may reduce the SVRR
between ground and the output, we cannot recommend using a smaller value.
*2. Signal muting function
The signal muting function is turned on by connecting the recommended RC circuit (10 µF, 15 k
Ω) to pin 6 and
applying a voltage of +5 V to the mute pin. This circuit implements a muting function with extremely low impulse
noise.
This RC circuit is used to smooth the attack and recovery times, and since the 10 µF capacitor also has the function
of smoothing after the startup time, it is required even if the signal muting function is not used.




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