SAMSUNG KA8602BD

KA8602B
LOW VOLTAGE AUDIO AMPLIFIER
INTRODUCTION
8-DIP-300
The KA8602B is the audio power amplifier available for
low voltages. KA8602B supplies differential outputs for maximizing 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.
8-SOP-225
FEATURES
l
l
l
l
l
l
l
l
Wide Supply Voltage (2 ~ 16V)
Low Quiescent Supply Current (ICC = 2.7mA : Typ)
Easy Gain Control
Medium Output Power
PO = 250mW at VCC = 6V, RL = 32Ω, THD = 10%
Minimum External Parts
Load Impedance Range (8Ω~ 100Ω)
Low Distortion
Mute Function (lCC = 65µA : Typ)
ORDERING INFORMATION
Device
Package
KA8602B
8-DIP-300
KA8602BD
8-SOP-225
Operating Temperature
- 20°C ~ + 70°C
BLOCK DIAGRAM
INPUT(-) 2
-
INPUT(+) 1
+
Amp1
R
3
OUTPUT1
6
OUTPUT2
R
Amp2
+
Vcc
4
BIAS CIRCUIT
8
5
RIPPLE
REJECTION
GND
7
Fig. 1
MUTE
KA8602B
LOW VOLTAGE AUDIO AMPLIFIER
PIN CONFIGURATION
INPUT(+)
1
INPUT(-)
2
8
RIPPLE REJECTION
7
MUTE
KA8602B
OUTPUT1
3
6
OUTPUT2
Vcc
4
5
GND
Fig. 2
PIN DESCRIPTION
Pin No
Symbol
1
Input (+)
Description
Analog Ground for the amplifiers. A 1.0µF capacitor at this pin (with a 5.0µF
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 (-)
3
Output 1
4
VCC
5
GND
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.
Amplifier 1’s output. The DC Level is
l
l
(VCC - 0.7V)/2.
DC supply voltage (+2.0 ~ + 16V) is applied to this pin.
Ground pin.
o
6
Output 2
Amplifier 2’s output. This signal is equal in amplitude, but 180 out of phase with
that at output1. The DC level is
l
l
(VCC - 0.7V)/2.
This pin can be used to power down the IC to conserve power, or for muting, or
7
Mute
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 VCC 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.
ABSOLUTE MAXIMUM RATINGS
Characteristic
Supply Voltage
Output Current (output pin)
Maximum Voltage (input, Ripple rejection, Mute pin)
Symbol
Vale
Unit
VCC
- 1.0 ~ + 18
V
IO
± 250
mA
V
VI (MAX)
- 1.0 ~ VCC + 1.0
Applied Output Voltage (output pin) when disabled
VO
- 1.0 ~ VCC + 1.0
V
Junction Temperature
TJ
- 55 ~ + 140
°C
KA8602B
LOW VOLTAGE AUDIO AMPLIFIER
RECOMMENDED OPERATING CONDITIONS (Ta = 25°C)
Characteristic
Symbol
Min
VCC
+2.0
+16
V
ZL
8
100
Ω
Supply Voltage
Load Impedance
Typ
Max
Unit
Peak Load Current
IL (PK)
± 200
mA
Differential Gain (5KHz Bandwidth)
∆GV
0
46
dB
Voltage at Mute (Pin 7)
VI (MUTE)
0
VCC
V
Ambient Temperature
Ta
-20
470
°C
ELECTRICAL CHARACTERISTIC
(VCC = 6V, Ta = 25°C, unless otherwise noted)
Characteristic
Symbol
Test Conditions
Min
Typ
Max
Unit
VCC = 3.0V, Mute = 0.8V
2.7
4.0
mA
VCC = 16.0V, Mute = 0.8V
3.3
5.0
DC ELECTRICAL CHARACTERISTICS
Operating Current
(RL = 0)
ICC
VCC = 3.0V, Mute = 2.0V
Output Voltage (output pin)
VO
RL = 16Ω
R1 = 75KΩ
VCC = 3.0V
1.0
65
100
1.15
1.25
VCC = 6.0V
2.65
VCC = 12.0V
5.65
-30
0
Output Offset Voltage
VOO
VCC = 6.0V, Rf = 75KΩ, RL = 32Ω
Output High Level
VOH
2.0V ≤ VCC ≤ 16V, Iout = -75mA
VCC-1.0
Output Low Level
VOL
2.0V ≤ VCC ≤ 16V, Iout = 75mA
0.16
Input Bias Current (pin 2)
IBIAS
Equivalent Resistance
REQ
Mute
Input Low Voltage
VIL (MUTE)
Input High Voltage
VIH (MUTE)
Input Resistance
RI (MUTE)
V
+30
V
-100
-200
nA
KΩ
100
150
220
pin 8
18
25
40
0.8
V
90
175
KΩ
0
+0.35
dB
2.0
50
mV
V
pin 1
VCC = Mute = 16V
µA
V
AC ELECTRICAL CHARACTERISTICS
Open Loop Gain (Amp 1)
GV (AMP1)
Close Loop Gain (Amp 2)
GV (AMP2)
Output Power
Total Harmonic Distortion
(f = 1.0KHz)
Gain Bandwidth Product
Power Supply Rejection
(VCC = 6.0V, ∆VCC = 3.0V)
Muting
PO
THD
80
f = 1.0KHz, RL = 32Ω
-0.35
VCC = 3.0V, RL = 6Ω, THD ≤ 10%
55
VCC = 6.0V, RL = 32Ω, THD ≤ 10%
250
VCC = 12V, RL = 100Ω, THD ≤ 10%
400
VCC = 6.0V, RL = 32Ω, PO =125mW
0.5
0.5
VCC≤12V, RL = 32Ω, PO = 200mW
0.6
1.5
C1 = ∞, C2 = 0.01µF
GV (MUTE)
mW
VCC≤3.0V, RL = 8Ω, PO = 20mW
GBW
PSRR
dB
50
%
MHz
dB
C1 =0.1µF, C2=0, f=1.0KHz
12
C1 = 1.0µF, C2 = 5.0µF, f = 1.0KHz
52
Mute = 2.0V, 1.0Khz ≤ f ≤ 20KHz
1.0
> 70
dB
KA8602B
LOW VOLTAGE AUDIO AMPLIFIER
APPLICATION CIRCUIT
Vcc
Mute
4
7
Rf
0.1 µF
Audio
Input
Ri
2
3
KA8602B
1
Speaker
6
8
+
1 µF
5
+
5µF
Fig. 3
Vcc
Mute
4
7
75K
0.1µF
Audio
Input
2
3
KA8602B
1
3K
+
0.1µF
Speaker
6
8
5
+
Fig. 4
5µF
KA8602B
LOW VOLTAGE AUDIO AMPLIFIER
Vcc(1.0 ~8.0V)
Vcc
75K
4
0.1 µF
Audio
Input
7
3K
4.7K
2
3
KA8602B
1
6
20K
Speaker
8
Mute
5
10K
20K
VEE( -1.0 ~ -8.0V)
Fig. 5
Vcc
Vcc
Mute
Mute
101
75K
100
100K
100K
4
7
0.1µF
Audio
Input
2
4
3
KA8602B
1
6
8
5
7
2
Speaker
3
KA8602B
0.1 µF
Audio
Input
1
503
8
5
503
503
503
+
5.1K
+
5µF
5.1K
5.1K
5 µF
5.1K
Fig. 6
Speaker
6
Fig. 7