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ZXCD100MOEVAL Datasheet(PDF) 4 Page - Zetex Semiconductors |
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ZXCD100MOEVAL Datasheet(HTML) 4 Page - Zetex Semiconductors |
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4 / 8 page  ZXCD100MOEVAL CIRCUIT DESCRIPTION. Propriety circuit design and high quality magnetics are necessary to yield the excellent THD performance of the solution. At the heart of the circuit is the Zetex ZXCD1000 class D audio IC. The ZXCD100MOEVAL circuit diagram is shown in figure 4. The circuit consists of a voltage regulator, an input phase splitter, the ZXCD1000, an output bridge to drive the load - via L-C filters, an anti-pop slow start circuit and an over-current protection circuit. (Note components are shown also for an over-temperature circuit however this circuit is application dependant and is not used on the demonstration board) The voltage regulator (Q5, ZD5 etc.) is necessary to drop higher supply voltages (35V on the bridge for 100W) to a level suitable for the ZXCD1000 and input phase splitter (12V on the board). The input phase splitter, built around the NE5532 dual op amp, is necessary to drive the Audio A and Audio B channels on the ZXCD1000. The Output Bridge is built around the Zetex ZXM64P035L3 and ZXM64N035L3 PMOS and NMOS TO220 transistors. Q10 and its associated compnents facilitate a slow start for the bridge supply voltage This circuit performs anti-pop for the solution. R28 is an over current sense resistor. The circuit shown (Q6, Q8 etc) enables an over-current protection for the solution. In fault conditions the circuit disables the triangle modulation waveform and thus disables the output bridge. Protection is given for speaker shorts and speaker to ground shorts. The ZXCD1000 outputs drive Output Bridge MOSFET’s, with the PWM signal, which subsequently drives the load via L-C filters. The purpose of this network is to low pass filter the high frequency switching PWM signal from the bridge. Thus the lower frequency audio signal is recovered and is available at the speaker outputs. ZXCD100MOEVAL CIRCUIT PERFORMANCE The graph shown in fig 5 indicates the THD performance of the 100W solution. THD is shown from zero up to full power. Distortion is sub 1% all the way up to full power, typically at 1W 1kHz, distortion is 0.4%. ZXCD100MOEVAL ISSUE 2 - JULY 2002 4 WARNING - Appropriate safety precautions should be taken by a competent person if the ZXCD100MOEVAL is to be connected to any potentially hazardous equipment. |
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