Document
UNISONIC TECHNOLOGIES CO.,LTD.
TEA2025AH
Preliminary
LINEAR INTEGRATED CIRCUIT
STEREO AUDIO AMPLIFIER
DESCRIPTION
The UTC TEA2025AH 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
ORDERING INFORMATION
Order Number
Lead Free
Halogen Free
TEA2025AHL-D16-T
TEA2025AHG-D16-T
Package DIP-16
DIP-16
Packing Tube
MARKING
www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co.,LTD.
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QW-R107-070.a
TEA2025AH
PIN CONFIGURATION
Preliminary
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
9 10
THERMAL PROTECTION
11
50
12
13
10k
START CIRCUIT
8
7
DECOUPLING
50
6
5
10k
4
14 15
5k
16
50
1
32
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 7
QW-R107-070.a
TEA2025AH
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (TA = 25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage Peak Output Current
VSS IO (peak)
15 1.5
V A
Junction Temperature Operating Temperature
TJ TOPR
150 -20 ~ +85
C °C
Storage Temperature
TSTG
-40 ~ +150
°C
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°C ~70°C operating temperature range
and assured by design from –20°C ~85°C.
THERMAL CHARACTERISTICS
PARAMETER Thermal Resistance Junction to ambient Thermal Resistance Junction to case
SYMBOL θJA θJC
RATINGS 60 15
UNIT °C/W °C/W
ELECTRICAL CHARACTERISTICS (TA = 25°C, VCC=10V, Stereo, unless otherwise specified.)
PARAMETER Supply Voltage Quiescent Current Quiescent Output Voltage
Voltage Gain
Voltage Gain Difference Input Impedance
Output Power
RL=4 RL=6
Total Harmonic Distortion
Stereo Bridge
Supply Voltage Rejection
Input Noise Voltage
RG=0 RG=10k
Cross-Talk
SYMBOL VSS IQ VOUT GV GV RIN
POUT
THD
SVR
Vn C.T.
TEST CONDITIONS
Stereo Bridge
Stereo per channel
THD=10%
f=1kHz, VCC=10V
THD=1%
Bridge, VCC=10V
THD=10% THD=1%
VCC=10V, RL=4, f=1kHz, POUT=1W
VCC=10V, RL=6, POUT=1W
RG=0,AV=45Db,VRIPPLE=1 FRIPPLE=100Hz
AV=200, Bandwidth:20Hz ~ 20kHz
RG=10k, f=1kHz,RL=4, POUT=1W
MIN TYP MAX UNIT
3 12 V
40 50 mA
5.0 V
43 45 47 dB
49 51 53
-1 +1 dB
30 k
1.5 W
1W
4.0 W
2W
0.5 1.0 0.5
%
40 46
dB
1.5 3
3 6
μV
40 55
dB
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R107-070.a
TEA2025AH
Preliminary
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 VIN
=
Rf
+
R1 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) Rf C1
R2
R1
2 (15)
BRIDGE MODE (Figure 2)
Figure 1
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
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R107-070.a
TEA2025AH
Preliminary
APPLICATION INFORMATION (Cont.)
LINEAR INTEGRATED CIRCUIT
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 TEA2025AH 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 TEA2025AH 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 t.