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PDF TEA2025A Data sheet ( Hoja de datos )
| Número de pieza | TEA2025A | |
| Descripción | STEREO AUDIO AMPLIFIER | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO.,LTD.
TEA2025A
LINEAR INTEGRATED CIRCUIT
STEREO AUDIO AMPLIFIER
DESCRIPTION
The UTC TEA2025A is a monolithic integrated circuit,
consisting of a 2-channel power amplifier. It is suitable for stereo
and bridge amplifier application of radio cassette tape recorders.
FEATURES
* High output power
Stereo: Po=2.3W (Typ) at Vcc=9V, RL=4 Ω
Bridge: Po=4.7W (Typ) at Vcc=9V, RL=8Ω
* Low switching distortion at high frequency
* Small shock noise at the time of power on/off dur to a built-in
muting circuit
* Good ripple rejection due to a built-in ripple filter
* Good channel separation
* Soft tone at the time of output straiten
* Closed loop voltage gain fixed 45dB (Bridge: 51dB) but
availability with external resistor added
* Minimum number of external parts required
* Easy to design radiator fin
ORDERING INFORMATION
Order Number
TEA2025AG-D12-H-T
Package
DIP-12H
Packing
Tube
MARKING
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co.,Ltd.
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QW-R107-012.C
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TEA2025A
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:
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)
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
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 8
QW-R107-012.C
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet TEA2025A.PDF ] | |
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