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UTC2003 S
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a D 10W CAR RADIO AUDIO . AMPLIFIER w
DESCRIPTION
The UTC2003 has improved performance with the same pin configuration as the UTC2002.The additional features of UTC2002,very low number of external components, ease of assembly, space and cost saving, are maintained. The device provides a high output current capacity(up to 3.5A) very low harmonic and crossover distortion.Completely safe operation is guaranteed due to protection against DC and AC short circuit between all pins and ground, thermal over-range, load dump voltage surge up to 40V and fortuitous open ground.
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS(Ta=25C)
CHARACTERISTICS
Peak Supply Voltage DC supply Voltage Operating supply voltage Output peak current(repetitive) Output peak current( non repetitive) Power dissipation at Tcase=90C Storage temperature junction temperature
SYMBOL
Vs Vs Vs Io Io Ptot Tstg Tj
PIN CONNECTION
1 Non inverting input 2 Inverting input 3 Ground 4 Output
5 Supply Voltage
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VALUE
40 28 18 3.5 4.5 20 -40~+150 -40~+150
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m o
V V V A A W
TO-220B
UNITS
C C
YOUWANG ELECTRONICS CO.LTD
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UTC2003
SCHEMATIC DIAGRAM
LINEAR INTEGRATED CIRCUIT
5
4
3 12
TEST CIRCUIT
+Vs
C3 100nF 100F
Vi
C1 1F
1 UTC2003 2
5 4 3
C4 1000F
Rx 39 Cx 39nF
R1 220 R3 1 100nF R2 2.2
RL
C2 470F
Rx=20*R2
Cx=1/(2B*R1)
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UTC2003
+Vs
100nF
mA
LINEAR INTEGRATED CIRCUIT
+Vs
100F C3 100nF
Vi
100nF
1 UTC2003 2
Vi
5 4 3
1
C1 1F
1000F
5 UTC2003 4 3
C4 1000F
R1 220 RL
2
R1 220 R3 1 R2 2.2
RL
470F
V
Cx 39nF
Rx=20*R2
Cx=1/(2p B*R1)
DC Test Circuit
AC Test Circuit
ELECTRICAL CHARACTERISTICS(Refer to the test circuit, Vs=14.4V,Ta=25C)
PARAMETER
Supply Voltage Quiescent Output Voltage Quiescent drain current
SYMBOL
Vs Vo Id
TEST CONDITIONS
MIN
8 6.1
TYP
MAX
18 7.7 50
100nF
R2 2.2
Rx 39
C2 470F
UNIT
V V mA
DC CHARACTERISTICS
6.9 44
AC CHARACTERISTICS
9 5.5
300 Po=1W,RL=4 f=1kHz Po=0.05 to 4.5W ,RL=4 Po=0.05 to 7.5W ,RL=2 40 15000 d=10%,f=1kHz RL=4 RL=2 RL=3.2 RL=1.6 f=1kHz Po=0.5W,RL=4 Po=6W,RL=4 Po=0.5W,RL=2 Po=10W,RL=2 6 10 7.5 12 14 55 10 50
Output power
Po
W
Input sensitivity
Vi
Input saturation voltage Frequency response(-3dB) Distortion
Vi(rms) B
mV mV mV mV mV Hz
D
0.15 0.15
%
(continued)
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UTC2003
PARAMETER
Input Resistance(pin 1) Input noise current Input noise voltage open loop voltage gain closed loop voltage gain Efficiency Supply voltage rejection
LINEAR INTEGRATED CIRCUIT
SYMBOL
Ri eN IN Gvo Gvc f=1kHz SVR Po=6W,RL=4 Po=10W,RL=2 f=100Hz,Vripple=0.5V Rg=10k,RL=4 69 65 30 36
Fig.3 Output power vs.Supply voltage
Po (W)
20 Gv=40dB f=1kHz d=10%
TEST CONDITIONS
open loop,f=1kHz
MIN
70
TYP
150 60 1 80 60
MAX
UNIT
k
200 5
f=1kHz f=10kHz f=1kHz,RL=4 39.3
pA V dB dB dB % % dB
40
40.3
Fig.1 Quiescent output voltage vs.Supply voltage
Vo(V)
8
Fig.2 Quiescent drain current vs.Supply voltage
Id(mA)
80
R=1.6 R=2
6
60
15
4
40
10
R=3.2 R=4
2
20
5
0 8 10 12 14 16
0
0 8 10 12 14 16
Vs(V)
Vs(V)
0
5
10
15
20
Vs(V)
Fig.4 output power vs.load resistance
Po (W)
16 Vs=16V Vs=14.4V 12 Gv=40dB f=1kHz d=10% 58 54 52 48 44 40 Vs=12V 8 36 32 Vs=8V 4 28 24 0 0 2 4 6 8 20 10
Fig.5 Gain vs. Input sensitivity
58 54 Gv=40dB f=1kHz RL=4 52 48 44 40 36 32 28 24 20 10
Fig.6 Gain vs. Input sensitivity
Gv=40dB f=1kHz RL=2
RL()
100
Vi(rms)
1000
100
Vi(rms)
1000
Fig.7 Distortion vs. output power
100
Fig.8 Distortion vs. frequency
d(%)
0.8 Gv=40dB Vs=14.4V RL=2/4
Fig.9 Supply voltage rejection vs. voltage gain
SVR (dB)
-10
d(%)
10 Gv=40dB f=1kHz Vs=14.4V
R=3.2
R=2
fripple=100Hz Vs=14,4V RL=2.2 Rg=10k
R=4 1
R=1.6
0.6
-20
Po=2.5W 0.4 0.1 0.2 Po=50mW
-30
-40
0.01 0.1
0 1 10
Po(W)
100
1 10
2 10
3 10
4 10
-50 30 35 40 45 50 55
Frequency (Hz)
Gv(dB)
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UTC2003
Fig. 10 Supply voltage rejection vs.frequency
SVR (dB)
0
LINEAR INTEGRATED CIRCUIT
Fig. 11 Power dissipation and efficiency vs. output power(Rl=4)
Ptot (W)
8
Fig. 12 Power dissipation and efficiency vs. output power(Rl=2)
(%) Ptot (W)
8
-20
Vs=14.4V Vripple=0.5V Gv=40dB f=1kHz Rg=10k
R2=22
(%) Vs=14.4V Gv=40dB f=1kHz
80
80
6
Vs=14.4V Gv=40dB f=1kHz
60
6
60
-40
4 Ptot
40
4
40
-60
R2=1
2
20
2
20
-80 10 2 10 3 10
frequency(Hz)
4 10
5 10
0 0 2 4 6 8
0
0 0 2 4 6 8
0
Po(W)
Po(W)
Fig. 13 Maximum Power dissipation and supply voltage(sine wave operation)
Ptot (W) 20 Ptot (W)
Fig. 14 Maximum allowable dissipation and ambient temperature
100 infinite heatsink 20
Fig. 15 Typical values of capacitor(Cx) for different values of frequency response
Cx (nF)
B=10kHz B=15kHz
15
15 10 RL=1.6 B=20kHz
10 RL=2
10 10 /W RL=3.2
5
0 0 5 10 15 20 Vs(V)
0 0 50 100 150 200 Tamb( )
APPLICATION INFORMATION
+Vs
100F C3 100nF
Vi
C1 1F
1 UTC2003 2
5 4 3
Rx 39 Cx 39nF
Rx=20*R2
Cx=1/(2B*R1)
Fig 16 Typical application circuit
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100nF
C2 470F
RL=4
5
30 /W
R2=2.2
1 36 40 44 48
Gv(dB)
C4 1000F
R1 220 R3 1 R2 2.2
RL
5
UTC2003
LINEAR INTEGRATED CIRCUIT
Vs=14.4V
1 0.1F
2.2F
1 2
5
UTC2003
5 4
RL=4 0.1F 200 430
1 2
2.2F
4
UTC2003
3
3
C3 15F
16
C4 10F
16
Fig.18 20W Bridge configuration application The Values of the capacitors C3 and C4 are different to optimize the SVR(Typ. 40dB)
Vs=14.4V
0.1F 0.1F
1 2
5
UTC2003
RL=4
5 4
UTC2003
1 2
0.1F
4
0.1F 0.1F
3
3
C3 15F 1nF
620
Fig.20 Low cost bridge configuration application circuit(Po=18W)
BUILT-IN PROTECTION SYSTEMS Load dump voltage surge
The UTC2003 has a circuit which enables it to withstand a voltage pulse train, on pin 5, of the type shown in Fig. 23. If the supply voltage peaks to more than 40V, then an LC filter must be inserted between the supply and pin 5, in order to assure that the pulses at pin 5 will be head within the limits shown in Fig.22. A suggested LC network is shown in Fig.23.With this network, a train of pulses with amplitude up to 120V and width of 2ms can be applied at point A. This type of protection is ON when the supply voltage(pulsed or DC) exceeds 18V.For this reason the maximum operating supply voltage is 18V.
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UTC2003
Vs (V) 40 t1=50ms
LINEAR INTEGRATED CIRCUIT
A
2mH From Supply Voltage 3000F 16V
B
To Pin 5
14.4 t t2=1000ms
Short Circuit (AC and DC Conditions)
The UTC2003 can withstand a permanent short-circuit on the output for a supply voltage up to 16V.
Polarity inversion
High current(up to 5A) can be handled by the device with no damage for a longer period than the blow-out time of a quick 1A fuse(normally connected in series with the supply). The feature is added to avoid destruction if, during fitting to the car, a mistake on connection of the supply is made.
Open ground
When the radio is in the ON condition and the ground is accidentally opened, a standard audio amplifier will be damaged. On the UTC2003 protection diodes are included to avoid any damage.
Inductive load
A protection diode is provide between pin 4 and pin 5(see the internal schematic diagram) to allow use of the UTC2003 with inductive loads. In particular,theUTC2003 can drive a coupling transformer for audio modulation.
DC voltage
The maximum operating DC voltage on the UTC2003 is 18V. However the device can withstand a DC voltage up to 28V with no damage. This could occur during winter if two batteries were series connected to crank the engine.
Thermal shut-down
The presence of a thermal limiting circuit offers the following advantages: 1).an overload on the output (even if it is permanent),or an excessive ambient temperature can be easily withstood. 2).the heat-sink can have a smaller factor compared with that of a conventional circuit. There is no device damage in case of excessive junction temperature: all that happens is that Po( and there Ptot) and Id are reduced.
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UTC2003
APPLICATION SUGGESTION
LINEAR INTEGRATED CIRCUIT
The recommended values of the components are those shown on application circuit of Fig.16. Different values can be used. The following table can help the designer.
Component
Recommended value
(Gv-1)*R2 2.2 1
Purpose
Large than recommended value
Decrease of SVR
Large than recommended value
increase of Gain
R1 R2 R3
Rx C1 C2 C3 C4 C5
20*R2 2.2F 470F 0.1F 1000F 0.1F
Cx
/(2 *B*R1)
Danger of oscillation at high frequencies with inductive loads. Upper frequency Poor high frequencies Dange of oscillation attenuation cutoff Input DC decoupling Noise at switch-on switch-off Ripple rejection Decrease of SVR Supply voltage Dange of oscillation bypass Output coupling to Higher low frequency load cutoff Frequency stability Danger of oscillation at high frequencies with inductive loads. Larger bandwidth Upper frequency smaller bandwidth cutoff
gain setting. gain and SVR setting. Frequency stacility
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