KA8602B LOW VOLTAGE AUDIO AMPLIFIER
INTRODUCTION
The KA8602B is the audio power amplifier available for
low voltages. KA8602B supplies differential outputs for max-
imizing output swing at low voltages. KA8602B doesn't
need coupling capacitors to the speaker. The gain of
this amp is controlled easily by two external resistors.
FEATURES
l
Wide Supply Voltage (2 ~ 16V)
l
Low Quiescent Supply Current (I
CC
= 2.7mA : Typ)
l
Easy Gain Control
l
Medium Output Power
P
O
= 250mW at V
CC
= 6V, R
L
= 32
, THD = 10%
l
Minimum External Parts
l
Load Impedance Range (8
~ 100
)
l
Low Distortion
l
Mute Function (l
CC
= 65
A : Typ)
BLOCK DIAGRAM
Fig. 1
Device
Package
Operating Temperature
KA8602B
8-DIP-300
KA8602BD
8-SOP-225
2
1
-
+
Amp1
4
BIAS CIRCUIT
8
5
-
+
Amp2
INPUT(-)
INPUT(+)
Vcc
RIPPLE
REJECTION
GND
OUTPUT1
OUTPUT2
3
6
7
MUTE
R
R
- 20
C ~ + 70
C
8-DIP-300
8-SOP-225
ORDERING INFORMATION
KA8602B LOW VOLTAGE AUDIO AMPLIFIER
PIN CONFIGURATION
Fig. 2
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
1
2
3
4
8
7
6
5
KA8602B
INPUT(+)
INPUT(-)
OUTPUT1
Vcc
RIPPLE REJECTION
MUTE
OUTPUT2
GND
Pin No
Symbol
Description
1
Input (+)
Analog Ground for the amplifiers. A 1.0
F capacitor at this pin (with a 5.0
F
capacitor at pin 8) provides 52dB (Typ) of power supply rejection. Turn-on time of
the circuit is affected by the capacitor on this pin. This pin can be used as an
alternative input.
2
Input (-)
Amplifier input. The input capacitor and resistor set low frequency roll-off and input
impedance. The feedback resistor is connected between this pin and output1.
3
Output 1
Amplifier 1's output. The DC Level is (V
CC
- 0.7V)/2.
4
V
CC
DC supply voltage (+2.0 ~ + 16V) is applied to this pin.
5
GND
Ground pin.
6
Output 2
Amplifier 2's output. This signal is equal in amplitude, but 180
o
out of phase with
that at output1. The DC level is (V
CC
- 0.7V)/2.
7
Mute
This pin can be used to power down the IC to conserve power, or for muting, or
both. When at a logic "Low" (0 to 0.8 volts), the KA8602B is enabled for normal
operation. When at a logic "High" (2.0 to V
CC
volts), the IC is disabled. If Mute is
open, that is equivalent to a logic "Low".
8
Ripple
Rejection
A capacitor at this pin increases power supply rejection, and affects turn-on time.
This pin can be left open if the capacitor at pin 1 is sufficient.
Characteristic
Symbol
Vale
Unit
Supply Voltage
Output Current (output pin)
Maximum Voltage (input, Ripple rejection, Mute pin)
Applied Output Voltage (output pin) when disabled
Junction Temperature
V
CC
I
O
V
I (MAX)
V
O
T
J
- 1.0 ~ + 18
250
- 1.0 ~ V
CC
+ 1.0
- 1.0 ~ V
CC
+ 1.0
- 55 ~ + 140
V
mA
V
V
C
l
l
l
l
KA8602B LOW VOLTAGE AUDIO AMPLIFIER
RECOMMENDED OPERATING CONDITIONS
(Ta = 25
C)
ELECTRICAL CHARACTERISTIC
(V
CC
= 6V, Ta = 25
C, unless otherwise noted)
Characteristic
Symbol
Min
Typ
Max
Unit
Supply Voltage
Load Impedance
Peak Load Current
Differential Gain (5KHz Bandwidth)
Voltage at Mute (Pin 7)
Ambient Temperature
V
CC
Z
L
I
L (PK)
G
V
V
I (MUTE)
Ta
+2.0
8
0
0
-20
+16
100
200
46
V
CC
470
V
mA
dB
V
C
Characteristic
Symbol
Test Conditions
Min
Typ
Max
Unit
DC ELECTRICAL CHARACTERISTICS
I
CC
V
CC
= 3.0V, Mute = 0.8V
V
CC
= 16.0V, Mute = 0.8V
2.7
3.3
4.0
5.0
mA
V
CC
= 3.0V, Mute = 2.0V
65
100
A
Output Voltage (output pin)
V
O
V
CC
= 3.0V
V
CC
= 6.0V
V
CC
= 12.0V
1.0
1.15
2.65
5.65
1.25
V
Output Offset Voltage
V
OO
V
CC
= 6.0V, R
f
= 75K
, R
L
= 32
-30
0
+30
mV
Output High Level
V
OH
2.0V
V
CC
16V, I
out
= -75mA
V
CC
-1.0
V
Output Low Level
V
OL
2.0V
V
CC
16V, I
out
= 75mA
0.16
V
Input Bias Current (pin 2)
I
BIAS
-100
-200
nA
Equivalent Resistance
R
EQ
pin 1
pin 8
100
18
150
25
220
40
K
Input Low Voltage
V
IL (MUTE)
0.8
V
Mute
Input High Voltage
V
IH (MUTE)
2.0
V
Input Resistance
R
I (MUTE)
V
CC
= Mute = 16V
50
90
175
K
AC ELECTRICAL CHARACTERISTICS
Open Loop Gain (Amp 1)
G
V (AMP1)
80
dB
Close Loop Gain (Amp 2)
G
V (AMP2)
f = 1.0KHz, R
L
= 32
-0.35
0
+0.35
dB
Output Power
P
O
V
CC
= 3.0V, R
L
= 6
, THD
10%
V
CC
= 6.0V, R
L
= 32
, THD
10%
V
CC
= 12V, R
L
= 100
, THD
10%
55
250
400
mW
Total Harmonic Distortion
(f = 1.0KHz)
THD
V
CC
= 6.0V, R
L
= 32
, P
O
=125mW
V
CC
3.0V, R
L
= 8
, P
O
= 20mW
V
CC
12V, R
L
= 32
, P
O
= 200mW
0.5
0.5
0.6
1.0
%
Gain Bandwidth Product
GBW
1.5
MHz
Power Supply Rejection
(V
CC
= 6.0V,
V
CC
= 3.0V)
PSRR
C
1
=
, C
2
= 0.01
F
C
1
=0.1
F, C
2
=0, f=1.0KHz
C
1
= 1.0
F, C
2
= 5.0
F, f = 1.0KHz
50
12
52
dB
Muting
G
V (MUTE)
Mute = 2.0V, 1.0Khz
f
20KHz
> 70
dB
R
L
= 16
R
1
= 75K
Operating Current
(R
L
= 0)
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