UTC A7240 20w bridge amplifier for car radio Datasheet

UNISONIC TECHNOLOGIES CO., LTD
A7240
LINEAR INTEGRATED CIRCUIT
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.
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
Normal
A7240-TB7-T
Order Number
Lead Free Plating
A7240L-TB7-T
Package
Packing
TO-220Z7
Tube
A7240L-TB7-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
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Copyright © 2005 Unisonic Technologies Co., Ltd
(1) T: Tube
(2) TB7: TO-220Z7
(3) Lead Free Plating, Blank: Pb/Sn
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A7240
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
7
6
5
4
3
2
1
Output
Supply Voltage
Output
GND
Input
Sub and Stand-by
Feedback
TAB Connected to Pin 4
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A7240
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Operating Supply Voltage
VSS
18
V
DC Supply Voltage
VSS
28
V
Peak Supply Voltage (for 50ms)
VSS(PEAK)
40
V
Peak Output Current (non repetitive t = 0.1ms)
IO(PEAK)(*)
4.5
A
Peak Output Current (repetitive f .10Hz)
I O(PEAK)(*)
3.5
A
Power Dissipation at TC = 85°C
PD
16
W
Storage and Junction Temperature
TSTG, TJ
-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
SYMBOL
θJC
RATINGS
4
UNIT
V
ELECTRICAL CHARACTERISTICS(Ta = 25°C, RTH (heatsink)= 4°C/W, VSS = 14.4V)
PARAMETER
Supply Voltage
Output Offset Voltage
SYMBOL
VSS
VO(OFF)
Total Quiescent Current
IQ
TEST CONDITIONS
RL =4Ω
Output Power
POUT
f = 1kHz, d= 10%
Distortion
THD
f = 1kHz, POUT = 50MW ~ 12W
Voltage Gain
GV
Supply Voltage Rejection
SVR
Total Input Noise
eN
Efficiency
η
Input Resistance
Input Sensitivity
Frequency Roll Off (-3dB)
Stand-by Threshold
Stand-by Current
Stand-by Attenuation
Low
High
RL =4Ω
RL =8Ω
RL =4Ω
RL =8Ω
f = 1KHz
Rg = 10KΩ
18
10
39.5
f = 100Hz, Rg = 10KΩ
35
B= Curve A
B = 22Hz~22KHz
RL =4Ω, f = 1KHz
RIN
f = 1kHz
VIN
fL
fH
f = 1kHz, POUT = 2W, RL =4Ω
POUT = 15W, RL =4Ω
VTHD (PIN2)
ISTN-BY
ASTN-BY VOUT = 2Vrms
UNISONIC TECHNOLOGIES CO., LTD
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MIN
TYP MAX UNIT
18
V
150 mV
65
20
12
0.1
0.05
40
40
2
3
65
120
W
0.5
0.5
40.5
%
dB
dB
10
µV
%
70
kΩ
28
88
25
129
1
70
mA
200
90
mV
Hz
kHz
V
µA
dB
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A7240
LINEAR INTEGRATED CIRCUIT
TEST AND APPLICATION CIRCUIT
+VSS
C7
0.22μF
C5
0.1μF
C4
220μF
INPUT
6
3
C1
1μF
7
OUT
UTC A7240
2
1
C2
22μF
STANDBY
R2
2.2Ω
4
5
C3
22μF
R1
2.2Ω
C6
0.22μF
COMPONENT USAGE SUGGESTION
Component
Suggest
Purpose
Larger than
Danger of High Frequency
Oscillation
R1, R2
2.2W
Frequency Stability
C1
1μF
Input DC Decoupling Higher Turn On and Stand-by Delay
C2
22μF
Ripple Rejection
C3
22μF
C4
C5
C6, C7
220μF
0.1μF
0.22μF
Increase of SVR Increase of the
Turn On Delay
Feedback low
Frequency Cutoff
Supply Filter
Supply Bypass
Frequency Stability
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Smaller than
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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LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
OutputPower vs. Supply Voltage
VSS = 10%
RL = 4Ω
f = 1KHz
22
18
14
10
6
4
2
6
0
9
10
11
12
13
14
15
2
5
10
14
VS (V)
PD (W)
OutputPower vs. Supply Voltage
Distortion vs. Output Power
THD = 10%
RL = 8Ω
f = 1KHz
14
VSS = 14.4V
RL = 8Ω
f = 1KHz
14
12
THD (%)
12
PD (W)
VSS = 14.4V
RL = 4Ω
f = 1KHz
8
THD (%)
PD (W)
Distortion vs. Output Power
10
10
8
8
6
6
4
4
9
10
11
12
13
14
15
16
VSS (V)
0
2
4
6
8
10
12
PD (W)
SupplyVoltage Rejection vs. Frequency
THD (%)
60
50
VSS = 14.4V
VR = 0.5V
Rg = 10KΩ
C2 = 22μF
10
C2 = 10μF
40
30
20
102
103
f (Hz)
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www.unisonic.com.tw
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A7240
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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