UTC-IC TEA2025L-D16-T

UNISONIC TECHNOLOGIES CO.,LTD.
TEA2025
LINEAR INTEGRATED CIRCUIT
STEREO AUDIO AMPLIFIER
„
DESCRIPTION
The UTC TEA2025 is a monolithic integrated audio amplifier in
a 16-pin plastic dual in line package. It is designed for portable
cassette players and radios.
„
FEATURES
*Working Voltage down to 3V
*Few External components
*High Channel isolation
*Voltage gain up to 45dB(Adjustable with external resistor)
*Soft clipping
*Internal Thermal protection
DIP-16
*Pb-free plating product number: TEA2025L
„
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
TEA2025-D16-T
TEA2025L-D16-T
„
Package
Packing
DIP-16
Tube
PIN CONFIGURATION
BRIDGE
1
16 +Vs
OUT.2
2
15 OUT.1
BOOT.2
3
14 BOOT.1
GND
4
13 GND
GND
5
12 GND
FEEDBACK
6
11 FEEDBACK
IN.2 (+)
7
10 IN.1 (+)
SVR
8
9
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Copyright © 2005 Unisonic Technologies Co.,LTD.
GND (sub)
1
QW-R107-033.B
TEA2025
„
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
9
10
11
12
13
14
15
50Ω
10kΩ
THERMAL
PROTECTION
START
CIRCUIT
5kΩ
8
16
DECOUPLING
50Ω
7
1
10kΩ
50Ω
6
5
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4
3
2
2
QW-R107-033.B
TEA2025
„
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta = 25℃)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VSS
15
V
Peak Output Current
IO (peak)
1.5
A
Junction Temperature
TJ
150
°C
Operating Temperature
TOPR
-20 ~ +85
℃
Storage Temperature
TSTG
-40 ~ +150
℃
Note 1. 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.
2. The device is guaranteed to meet performance specification within 0℃~70℃ operating temperature range
and assured by design from –20℃~85℃.
„
ELECTRICAL CHARACTERISTICS (Ta=25℃, VCC=9V, Stereo, unless otherwise specified.)
PARAMETER
Supply Voltage
Quiescent Current
Quiescent Output Voltage
SYMBOL
VSS
IQ
VOUT
Voltage Gain
GV
Voltage Gain Difference
Input Impedance
RL=4Ω
RL=8Ω
RL=4Ω
Output Power
RL=8Ω
Total Harmonic
Distortion
RL=4Ω
RL=8Ω
RL=4Ω
Stereo
Bridge
Supply Voltage Rejection
Input Noise Voltage
Cross-Talk
„
TEST CONDITIONS
MIN
3
Stereo
Bridge
43
49
ΔGV
RIN
f=1kHz,THD=10%, VCC=9V
Stereo per channel
POUT
THD
SVR
RG=0
Vn
RG=10kΩ
C.T.
1.7
0.7
VCC=6V
40
AV=200, Bandwidth:20Hz ~ 20kHz
RG=10kΩ, f=1kHz,RL=4Ω, POUT=1W
40
4.5
45
51
40
MAX
12
50
47
53
+-1
UNIT
V
mA
V
dB
30
2.3
1.3
1
0.6
0.1
4.7
2.8
0.3
0.5
VCC=3V
Bridge, VCC=9V
VCC=6V
VCC=9V, RL=4Ω, f=1kHz,POUT=250mW
RG=0,AV=45Db,VRIPPLE=150mV
FRIPPLE=100Hz
TYP
dB
kΩ
W
1.5
46
%
dB
1.5
3
3
6
μV
55
dB
THERMAL CHARACTERISTICS
PARAMETER
Thermal Resistance Junction to ambient
Thermal Resistance Junction to case
UNISONIC TECHNOLOGIES CO., LTD
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SYMBOL
θJA
θJC
RATINGS
60
15
UNIT
℃/W
3
QW-R107-033.B
TEA2025
„
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION
Input Capacitor
Input capacitor is PNP type allowing source to be referenced to ground. In this way no input coupling capacitor is
required. However, a series capacitor (0.22 uF)to the input side can be useful in case of noise due to variable
resistor contact.
Bootstrap
The bootstrap connection allows to increase the output swing. The suggested value for the bootstrap capacitors
(100uF) avoids a reduction of the output signal also at low frequencies and low supply voltages.
Voltage Gain Adjust
STEREO MODE (Figure 1)
The voltage gain is determined by on-chip resistors R1 and R2 together with the external RfC1 series connected
between pin 6 (11) and ground. The frequency response is given approximated by:
VOUT
R1
=
VIN
Rf + R2 + 1
JWC1
With Rf=0, C1=100μF, the gain results 46 dB with pole at f=32 Hz.
THE purpose of Rf is to reduce the gain. It is recommended to not reduce it under 36 dB.
6 (11)
R2
2 (15)
Rf
R1
C1
Figure 1
BRIDGE MODE (Figure 2)
The bridge configuration is realized very easily thanks to an internal voltage divider which provides (at pin 1) the
CH 1 output signal after reduction. It is enough to connect pin 6 (inverting input of CH 2) with a capacitor to pin 1 and
to connect to ground the pin 7.
The total gain of the bridge is given by:
and with the suggested values (C1 = C2 = 100 uF, Rf = 0) means: Gv = 52 dB with first pole at f = 32 Hz
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QW-R107-033.B
TEA2025
LINEAR INTEGRATED CIRCUIT
IN
OUT
OUT
R1
R1
R3
R2
R2
R4
Figure 2
Output Capacitors
The low cut off frequency due to output capacitor depending on the load is given by:
with COUT 470uF and RL = 4 ohm it means FL = 80Hz.
Pop Noise (Figure 3)
Most amplifiers similar to UTC TEA2025 need external resistors between DC outputs and ground in order to
optimize the pop on/off performance and crossover distortion.
OUT
800
Figure 3
The UTC TEA2025 solution allows to save components because of such resistors (800 ohm) are included into the
chip.
Stability
A good layout is recommended in order to avoid oscillations. Generally the designer must pay attention on the
following points:
- Short wires of components and short connections.
- No ground loops.
- Bypass of supply voltage with capacitors as nearest as possible to the supply I. C. pin. The low value (poliester)
capacitors must have good temperature and frequency characteristics.
- No sockets.
The heatsink can have a smaller factor of safety compared with that of a conventional circuit. There is no device
damage in the case of excessive junction temperature: all that happens is that PO (and therefore Ptot) and Id are
reduced.
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QW-R107-033.B
TEA2025
„
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
Vcc
Vcc
100 F
0.22 F
10
16
Vin
100 F
100 F
100 F
2
1
100 F
RL
3
100 F
8
Vin
1
0.15 F
7
6
0.22 F
14
15
11
10
100 F
16
4,5,9,12,13
100 F
14
15
11
470 F
0.15 F
0.22 F
Vin
2
100 F
3
6
100 F
8
OUT1
RL
100 F
7
2
0.15 F
Fig. 4 Bridge Application
„
100 F
470 F
0.15 F
OUT2
RL
4,5,9,12,13
Fig.5 Stereo Application
SCHEMATIC DIAGRAM
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QW-R107-033.B
TEA2025
„
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
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
7
QW-R107-033.B