VESTEL 17MB12, Service Manual

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 High level digital IF outputs
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 RF-Modulator input for loop through to TV output (optional)
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 Wide band AGC
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 Indoor Antenna power feed through (optional)
2.3 Pinning:
3 AUDIO AMPLIFIER STAGE WITH TDA8932
3.1 General Description
The TDA8932 device is the high-power version that delivers an output power of 2 x 10
WRMS to 2 x 25 WRMS in a Single Ended (SE) configuration or 10 WRMS to 50 WRMS
in a Bridge Tied Load (BTL) configuration. The TDA8933 device is the low-power
version that delivers an output power of 2 x 5 WRMS to 2 x 15 WRMS in a Single Ended
(SE) configuration or 10 WRMS to 20 WRMS in a Bridge Tied Load (BTL) configuration.
This high efficiency SMA device is designed to operate without a heat sink and has the
flexibility to operate from either an asymmetrical supply or a symmetrical supply with a
wide range (10 V to 36 V or +/-5 V to +/-18 V). The TDA8932/33 device utilizes two
advanced features, respectively the thermal fold back and the cycle-by-cycle current
limiting to avoid audio holes (interruptions) during normal operation.
3.2 Features
• High efficiency Class-D audio amplifier due to a low RDS_ON
• Operates from a wide voltage range 10 V to 36 V (asymmetrical) or +/-5 V to +/-18 V
(symmetrical)
• Maximum power capability:
• TDA8932 is 2 x 25 WRMS maximum in 4
Ω SE without heat sink
• TDA8933 is 2 x 15 WRMS maximum in 8 Ω SE without heat sink
• Cycle-by-cycle current limiting to avoid interruption during normal operation
• Unique Thermal Foldback (TF) to avoid interruption during normal operation
• Integrated Half Supply Voltage (HVP) buffers for reference and SE output capacitance
(asymmetrical supply)
• Internal logic for pop-free power supply on/off cycling
• Low standby-current in SLEEP-mode for power saving regulations