la4625 Sanyo Semiconductor Corporation, la4625 Datasheet - Page 4

• Manufacturer Part Number: la4625
• Description: Two-channel 13.5 W Btl Audio Power Amplifier
• Manufacturer: Sanyo Semiconductor Corporation

Pin Voltages
V
External Components
C1 and C4: Input capacitors. A value of 2.2 µF is recommended. Determine the polarity based on the DC potential of the
C6, C7, C8, and C9:
IC Internal Characteristics and Notes
1. Standby function
2. Muting function
CC
Pin voltage
Pin voltage
Pin No.
Pin No.
• Pin 4 is the standby switch. A voltage of 2.5 V or
• If a voltage of over 12 V will be applied as the
• Pin 5 connects the capacitor that determines the starting time to prevent impulse noise. It can also be used to mute
= 12 V, with 5 V applied to STBY through a 10 kΩ resistor, RL = 4 Ω, Rg = 0
R
Pin
Pin
higher must be applied through an external resistor to
turn the amplifier on.
standby mode switching voltage, use the following
formula to determine the value of R
current entering at pin 4 remains under 500 µA.
the amplifier output by shorting pin 5 to ground. When this function is used, the recovery time depends on C3.
1
C10: Impulse noise reduction capacitor. A value of 0.47 µF is recommended. Caution is required when selecting
= —————————— – 10 kΩ
C2: Decoupling capacitor (ripple filter)
C3: Sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33 µF. The starting
C5: Power-supply capacitor
R1: Standby switch current limiting resistor. A value of 10 kΩ is recommended when a voltage in the range 2.5
<applied voltage> – 1.4
circuit connected directly to the LA4625 front end. Note that the low band response can be adjusted by
varying f
time is proportional to the value of this capacitor, and can be set to any desired value.
Oscillation prevention capacitors. Use polyester film capacitors (Mylar capacitors) with excellent
characteristics. (Note that the series resistors R2, R3, R4, and R5 are used in conjunction with these
capacitors to achieve stable amplifier operation.) A value of 0.1 µF is recommended.
the value for this capacitor, since increasing its value influences the operation of the circuits that protect
against shorting the amplifier output pins to V
16 V or higher) are used.
to 12 V will be applied as the standby switching voltage. Note that this resistor is not optional: it must be
included.
+OUT2
1.46 V
5.21 V
IN1
1
8
500 µA
L
with the capacitors C1 and C4.
–OUT2
5.21 V
5.18 V
DC
2
9
PWR–GND2
PRE–GND
1
so that the
0 V
0 V
10
3
+OUT1
3.21 V
5.21 V
STBY
LA4625
11
4
CC
or to ground when higher V
PWR–GND1
ON TIME
2.26 V
0 V
12
5
Applied standby
voltage
Pin 4 Internal Equivalent Circuit
500 A or lower
–OUT1
1.46 V
5.21 V
R1
IN2
13
6
4
2.05 V
CC
POP
12 V
V
14
About 1.4 V
(2 V
7
CC
voltages (approximately
BE
10 k
)
No. 6631-4/8