LA4635A
No. 6983-2/3
Sample Application Circuit
+
1
μ
F
1
DC
+
1
μ
F
5
IN1
+
1
μ
F
5
IN2
+
4
μ
F
1
1
μ
F
2
P.P
PWR
GND
+
1
μ
F
1
OUT2
NC
NC
STBY
VCC
7
VCC
R
PRE
GND
(Ripple Filter)
(Popping Noise
Eliminator)
5
+
+
1
μ
F
1
OUT1
R
LA4635A
Top view
1
2
3
4
5
6
10
11
12
8
9
ILA00778
R
Operating Characteristics
at Ta = 25
°
C, V
CC
= 12 V, R
L
= 3
, f = 1 kHz, Rg = 600
Parameter
Symbol
Conditions
Ratings
typ
35
min
18
max
80
10
37
0.4
Unit
mA
μ
A
dB
%
W
W
mV
dB
dB
k
V
Quiescent current
Standby current
Voltage gain
Total harmonic distortion
Output power
I
CCO
Ist
VG
THD
P
O
1
P
O
2
V
NO
SVRR
CH Sep
Ri
V
ST
Rg = 0
1
V
O
= 0 dBm
P
O
= 1 W
THD = 10%
V
CC
= 9 V, THD = 10%
Rg = 0, BPF = 20 Hz to 20 kHz
Rg = 0, f
R
= 100 Hz, V
R
= 0 dBm
Rg = 10 k
, V
O
= 0 dBm
33
35
0.15
4.5
2.5
0.05
60
65
30
5.0
3.0
2.0
Output noise voltage
Ripple rejection
Channel separation
Input resistance
Standby pin voltage
0.25
50
55
20
1.5
40
Amplifier on (pin 5 voltage)
* If voltage is to be
applied to the Standby
pin (pin 5), a resistor
(Rx) should be
inserted to limit the
inflow current, as
required. Please refer
to the information
below.
The amplifier can be turned on and off by controlling
the level (high/low) of pin 5.
Applying a signal equal or greater than 1.5 V and
800
μ
A to pin 5 turns on the amplifier. (If 5 V is applied
directly to pin 5 the inflow current of pin 5 is approxi-
mately 4.5 mA.)
If a voltage, Vx, exceeding 5 V is to be applied, current
limiting resistor (Rx) should be inserted to limit the
inflow current to 4.5 mA. (See following equation.)
Rx = (Vx – 5 V) / 4.5 mA
If pin 5 is to be controlled by the microprocessor, the
pin 5 inflow current (Ix) should be optimized for the
capacity of the microprocessor by calculating Rx using
the following equation, as a general guideline, and then
confirming the inflow current through actual measure-
ment.
Rx = (Vx / Ix) – R1 (2 k
)
Note: The LA4635A is basically pin-compatible with the
LA4636, but there are partial differences in
operation and usage, including with regard to
externally connected parts.
--20
0
120
80
100
140
20
40
60
160
0
5
10
15
3.2
7
12.5
25
20
30
ILA00777
Pd max -- Ta
qjc=3
°
C / W
A
–
Infinite heat sink
AI heat sink
Mounting
torque 39N
cm
Flat washer
Silicone grease
applied
100
¥
100
¥
1.5 mm
3
50
¥
50
¥
1.5 mm
3
Ambient temperature, Ta
–
°
C
Single IC
+
Ix
Rx
Ix=max 4.5mA
STBY
R2
2k
R
2
ILA00779
5
Standby
Pin Voltage
Vx
(Reference) Pin 5 Equivalent Circuit Inside IC