www.fairchildsemi.com
FAN7040
3W Mono BTL Amplifier with DC Volume Control
Features
•
•
•
•
•
•
•
•
•
•
DC Volume Control : +37dB ~ -52dB
Few External Components
Mute Mode
Thermal Protection
Short-Circuit Proof
No Switch-On or Switch-Off Clicks
Good Overall Stability
Low Power Consumption
Low HF Radiation
ESD Protected On All Pins
Description
The FAN7040 is a mono Bridge-Tied Load(BTL) output
amplifier with DC volume control. It is designed for use in
TVs and monitors, but is also suitable for battery-fed porta-
ble recorders and radios. The device is contained in a 20-lead
small outline package.
A Missing Current Limiter(MCL) is built in. the MCL cir-
cuit is activated when the difference in current between the
output terminal of each amplifier exceeds 130mA. This level
of 130mA allows for Single-Ended(SE) headphone applica-
tions.
20SOP
Applications
•
•
•
•
TVs and Monitors
Portable Computers
Desktop computers
Low Voltage Audio Systems
1
Internal Block Diagram
VCC
4
FAN7040
IN
5
Power Amp
14
OUT+
VGA
17
OUT-
VC
7
Missing current
protection
DC Gain Bandgap
Control Reference Over-Temperature
Protection
1-3, 8-13, 16, 18 and 20
6
Power Amp
15
NC
SGND
PGND
Rev. 1.1.0
©2004 Fairchild Semiconductor Corporation
FAN7040
Pin Assignments
1
20
FAN7040
10
11
Pin Description
Pin No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
N.C.
N.C.
N.C.
V
CC
IN
SGND
VC
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
OUT+
PGND
N.C.
OUT-
N.C.
N.C.
N.C.
O
O
I
I
I
I/O
No Connection
No Connection
No Connection
Positive Power Supply
Signal Input
Signal Ground
DC Volume Control
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
Positive Output
Power Ground
No Connection
Negative Output
No Connection
No Connection
No Connection
Description
2
FAN7040
Absolute Maximum Ratings
Parameter
Maximum Supply Voltage
Maximum Input Voltage
Repetitive Peak Output Current
Non-repetitive Peak Output Current
Power Dissipation
Storage Temperature
Junction Temperature
Thermal Resistance
Symbol
V
CCmax
V
PIN5
, V
PIN7
I
ORM
I
OSM
P
D
T
STG
T
J
Rthj-a
Value
18
5.0
1.25
1.5
Internally Limited
-55 ~ +150
150
70
Unit
V
V
A
A
W
°C
°C
°C/W
Remark
Operating Ratings
Parameter
Power Supply Voltage
Operating Temperature
Symbol
V
CC
T
OPG
Min
4.5
-40
Typ
-
-
Max
18
+85
Unit
V
°C
3
FAN7040
Electrical Characteristics
(V
CC
= 12V, Ta = 25°C, R
L
=16Ω, unless otherwise specified)
Parameter
Supply Current
Maximum Gain(VC=2V)
Note 2
Output Power
Total Harmonic Distortion
Maximum Total Voltage Gain
Input Signal Handling(RMS)
Noise Output Voltage
Power Supply Rejection Ratio
DC Output Offset Voltage
Input Impedance(pin3)
Minimum Gain(VC=0.5V)
Minimum Total Voltage Gain
Noise Output Voltage
Mute Position
Output Voltage in Mute Position
DC Volume Control
Voltage Gain Control Range
Control Current
∆G
V
I
VC
|G
V,max
|+|G
V,min
|
VC=0V
-
50
89
62
-
75
dB
µA
V
o,mute
VC=0.3V, V
I
=600mVrms,
f=1kHz
-
1
-
µV
G
V,min
V
n(o)
f=1kHz, Rs=0Ω
-65
-
-52
1
-40
-
dB
µV
P
O
THD
G
V,max
V
i,rms
V
n(o)
PSRR
∆V
OS
Z
I
VC=0.8V, THD<1%
f=1kHz, Rs=0Ω
Vripple=200mV, Rs=0Ω, f=1kHz
|(OUT+)-(OUT-)|, VC=1.4V
THD+N =10%, R
L
=16Ω
P
O
= 0.5W
3
-
34
0.6
-
30
-
15
3.5
0.3
37
0.7
15
-
-
20
-
1
-
-
-
-
210
25
W
%
dB
Vrms
µV
dB
mV
kΩ
Symbol
I
CC
Conditions
V
i
=0V, No Load
note1
Min.
-
Typ.
5
Max.
10
Unit
mA
Notes
1. With a load connected to the outputs, the quiescent current will increase as much as the DC output offset voltage divided by R
L
.
2. The maximum gain of the amplifier is normally reached at VC=1.4V typical.
.
4
FAN7040
Performance Characteristics
7.0m
6.0m
5.0m
4.0m
3.0m
2.0m
1.0m
0.0
VCC=12V
VC=2V
No load
-20
-30
-40
-50
-60
-70
-80
-90
+0
-10
VC=2V, Rs=5kΩ
VC=2V, Rs=0
Ω
Supply Current [A]
PSRR [dB]
VC=0.5V, Rs=5kΩ
0
4
8
12
Supply Voltage [V]
16
20
-100
20
50
100
200
500
1k
2k
5k
10k
20k
50k 100k
Fig. 1 Supply Current
Frequency [Hz]
Fig. 2 Power Supply Rejection Ratio
30
20
10
5
10
5
2
VCC=12V
VC=2V
f=1kHz
R
L
=16Ω
BW<22kHz
2
1
THD+N [%]
1
0.5
THD+N [%]
0.5
0.2
0.1
0.2
0.1
0.05
0.05
VCC=12V
VC=2V
R
L
=16Ω
BW<80kHz
0.02
0.01
10m
0.02
20m
50m
100m
200m
500m
1
2
5
10
0.01
20
50
100
200
500
1k
2k
5k
10k
20k
Output Power [W]
Frequency [Hz]
Fig. 3 THD+N vs. Output Power
Fig. 4 THD+N vs. Frequency
1.0
40
20
0
Gain [dB]
-20
-40
-60
-80
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
VCC=12V
0.9
Input Voltage [Vrms]
0.8
0.7
0.6
0.5
0.4
0.3
VCC=12V
VC=0.8V
R
L
=16Ω
THD+N=1%
2
4
6
8
10
12
14
16
18
20
DC Volume Control Voltage [V]
Power Supply [V]
Fig. 5 Gain vs. DC Volume Control
Fig. 6 Input Signal Handling
5
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