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AN5274 Datasheet(PDF) 5 Page - Panasonic Semiconductor |
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AN5274 Datasheet(HTML) 5 Page - Panasonic Semiconductor |
5 / 7 page 5 ICs for Audio Common Use AN5274 s Technical Information (continued) • Application Note (continued) 4) Oscillation To prevent oscillation, it is advisable to use RC (Zobel network) at output. C of polyester film capacitor has smaller characteristic fluctuation with temperature and frequency. The resistor R connected in series with C is effective for phase correction at high frequency, and as a result, it improves the oscillation allowance. 0.047 µF RL = 8 Ω 20 Ω C Pin7 12 R 1000 µF 5) Power-ON/OFF pop-noise elimination The output pins 7, 12 and VO, during power turns ON and OFF are shown below : The turn ON time in the AN5274 is determined by the capacitance value of CRF. If value of the CRF is smaller, VO will turn on faster. The turn OFF time is dependent on the capacitance value of CVCC. Pop-noise would occur when VCC voltage declines faster than RF voltage. To solve this, increase the discharge time of VCC by increasing the capacitance values of CVCC. The recommended values of capacitance for CVCC and CRF are shown below : CRF CVCC Recommended Operating VCC Range Unit 33 µF 470 µF 14.5 to 27.5 V CVCC CRF VCC VO Pin7 & Pin12 Turn ON time Turn OFF time CRF = 100 µF 33 µF 47 µF |
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