UNISONIC TECHNOLOGIES CO., LTD
A7240
20W BRIDGE AMPLIFIER FOR
CAR RADIO
DESCRIPTION
The UTC
A7240
is a 20W bridge audio amplifier IC and designed
for car radio applications.
A comprehensive array of on-chip protection, include protection
against AC and DC output short circuits (to ground and across the
load), load dump transients, and junction over temperature, is
feature to provide reliable operation. Furthermore, the UTC
A7240
protects the loudspeaker when one output is short-circuited to
ground.
LINEAR INTEGRATED CIRCUIT
1
TO-220Z7
FEATURES
* Few External Components
* Output Protected Against short Circuits to Ground and Across
Load
* Dump Transient
* Thermal Shutdown
* Loudspeaker Protection
* High Current Capability
* Low Distortion/Low Noise
*Pb-free plating product number: A7240L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
A7240-TB7-T
A7240L-TB7-T
Package
TO-220Z7
Packing
Tube
A7240L-TB7-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) T: Tube
(2) TB7: TO-220Z7
(3) Lead Free Plating Blank: Pb/Sn
,
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Copyright © 2005 Unisonic Technologies Co., Ltd
1 of 6
QW-R107-048,A
A7240
PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
7
6
5
4
3
2
1
TAB Connected to Pin 4
Output
Supply Voltage
Output
GND
Input
Sub and Stand-by
Feedback
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QW-R107-048,A
A7240
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
RATINGS
UNIT
Operating Supply Voltage
V
SS
18
V
DC Supply Voltage
V
SS
28
V
Peak Supply Voltage (for 50ms)
V
SS(PEAK)
40
V
Peak Output Current (non repetitive t = 0.1ms)
I
O(PEAK)
(*)
4.5
A
Peak Output Current (repetitive f .10Hz)
I
O(PEAK)
(*)
3.5
A
Power Dissipation at T
C
= 85°C
P
D
16
W
Storage and Junction Temperature
T
STG
, T
J
-40~+150
°C
Note Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
(*) Internally limited
THERMAL DATA
PARAMETER
Thermal Resistance Junction-case
PARAMETER
Supply Voltage
Output Offset Voltage
Total Quiescent Current
Output Power
Distortion
Voltage Gain
Supply Voltage Rejection
Total Input Noise
Efficiency
Input Resistance
Input Sensitivity
Frequency Roll Off (-3dB)
Stand-by Threshold
Stand-by Current
Stand-by Attenuation
Low
High
SYMBOL
V
SS
V
O(OFF)
I
Q
P
OUT
THD
G
V
SVR
eN
η
R
IN
V
IN
f
L
f
H
R
L
=4Ω
f = 1kHz, d= 10%
f = 1kHz, P
OUT
= 50MW ~ 12W
f = 1KHz
f = 100Hz, Rg = 10KΩ
Rg = 10KΩ
R
L
=4Ω, f = 1KHz
f = 1kHz
f = 1kHz, P
OUT
= 2W, R
L
=4Ω
P
OUT
= 15W, R
L
=4Ω
88
25
200
90
70
28
129
1
70
B= Curve A
B = 22Hz~22KHz
R
L
=4Ω
R
L
=8Ω
R
L
=4Ω
R
L
=8Ω
18
10
SYMBOL
θ
JC
TEST CONDITIONS
RATINGS
4
MIN
UNIT
V
TYP MAX UNIT
18
V
150 mV
65
20
12
0.1
0.05
40
40
2
3
65
120
mA
W
0.5
0.5
40.5
%
dB
dB
10
µV
%
kΩ
mV
Hz
kHz
V
µA
dB
ELECTRICAL CHARACTERISTICS
(Ta = 25°C, R
TH
(heatsink)= 4°C/W, V
SS
= 14.4V)
39.5
35
V
THD (PIN2)
I
STN-BY
A
STN-BY
V
OUT
= 2Vrms
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3 of 6
QW-R107-048,A
A7240
TEST AND APPLICATION CIRCUIT
+V
SS
C4
220μF
C5
0.1μF
6
LINEAR INTEGRATED CIRCUIT
C7
0.22μF
R2
2.2Ω
7
OUT
5
R1
2.2Ω
C6
0.22μF
INPUT
C1
1μF
3
UTC A7240
2
C2
22μF
1
C3
22μF
4
STANDBY
COMPONENT USAGE SUGGESTION
Component
R1, R2
C1
C2
C3
C4
C5
C6, C7
Suggest
2.2W
1μF
22μF
22μF
220μF
0.1μF
0.22μF
Purpose
Frequency Stability
Larger than
Danger of High Frequency
Oscillation
Smaller than
Input DC Decoupling Higher Turn On and Stand-by Delay
Ripple Rejection
Feedback low
Frequency Cutoff
Supply Filter
Supply Bypass
Frequency Stability
Increase of SVR Increase of the
Turn On Delay
Higher Turn On Pop.
Higher Low Frequency Cutoff
Degradation of SVR
Higher Low Frequency Cutoff
Danger of Oscillation
Danger of Oscillation
Danger of Oscillation
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4 of 6
QW-R107-048,A
A7240
TYPICAL CHARACTERISTICS
OutputPower vs. Supply Voltage
LINEAR INTEGRATED CIRCUIT
Distortion vs. Output Power
22
V
SS
= 10%
R
L
= 4Ω
f = 1KHz
THD (%)
8
V
SS
= 14.4V
R
L
= 4Ω
f = 1KHz
P
D
(W)
18
6
14
4
10
2
6
9
10
11
12
13
V
S
(V)
14
15
0
2
5
10
P
D
(W)
14
OutputPower vs. Supply Voltage
THD = 10%
R
L
= 8Ω
f = 1KHz
Distortion vs. Output Power
V
SS
= 14.4V
R
L
= 8Ω
f = 1KHz
14
12
14
12
THD (%)
9
10
11
12
13
14
15
16
P
D
(W)
10
8
6
4
V
SS
(V)
10
8
6
4
0
2
4
6
8
P
D
(W)
10
12
SupplyVoltage Rejection vs Frequency
.
V
SS
= 14.4V
V
R
= 0.5V
Rg = 10KΩ
60
THD (%)
50
10
40
C2 = 22μF
C2 = 10μF
30
20
10
2
10
3
f (Hz)
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www.unisonic.com.tw
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QW-R107-048,A
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