SERVICE MANUAL FOR M35&36; CHASSIS

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TCL Block Diagram and Pin Configuration Chassis M35&<strong>36</strong> Service Manual Pin Description No. Symbol Pin Description 1 OUT− 1 negative loudspeaker terminal 2 VCC 2 supply voltage 3 OUT+ 3 positive loudspeaker terminal 4 IN+ 4 positive input 5 IN− 5 5negative input 6 SVR 6 6half supply voltage decoupling (ripple rejection) 7 MODE 7 mode selection input (standby, mute, operating) 8 GND 8 ground 9 n.c. 9 not connected Functional Description The TDA8945S is a mono BTL audio power amplifier capable of delivering 15 Woutput power to an 8 Ω load at THD = 10%, using an 18 V power supply and an external heatsink. The voltage gain is fixed at 32 dB. With the three-level MODE input the device can be switched from ‘standby’ to ‘mute’ and to ‘operating’ mode. The TDA8945S outputs are protected by an internal thermal shutdown protection mechanism and a short-circuit protection. 1 Input configuration The TDA8945S inputs can be driven symmetrical (floating) as well as asymmetrical. In the asymmetrical mode one input pin is connected via a capacitor to the signal ground which should be as close as possible to the SVR (electrolytic) capacitor ground. Note that the DC level of the input pins is half of the supply voltage VCC, so coupling capacitors for both pins are necessary. 2 Power amplifier The power amplifier is a Bridge Tied Load (BTL) amplifier with an all-NPN output stage, capable of delivering a peak output current of 2 A. The BTL principle offers the following advantages: Lower peak value of the supply current The ripple frequency on the supply voltage is twice the signal frequency 18 03.Mar.2003
TCL Chassis M35&<strong>36</strong> Service Manual No expensive DC-blocking capacitor Good low frequency performance. 3 Mode selection The TDA8945S has three functional modes, which can be selected by applying the proper DC voltage to pin MODE. Standby- In this mode the current consumption is very low and the outputs are floating. The device is in standby mode when (VCC − 0.5 V) < VMODE < VCC, or when the MODE pin is left floating (high impedance). The power consumption of the TDA8945S will be reduced to
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SERVICE MANUAL FOR M35&36; CHASSIS

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