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TDA1562SD bảng dữ liệu(PDF) 8 Page - NXP Semiconductors |
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TDA1562SD bảng dữ liệu(HTML) 8 Page - NXP Semiconductors |
8 / 24 page 2003 Feb 12 8 Philips Semiconductors Preliminary specification 70 W high efficiency power amplifier with diagnostic facility TDA1562Q; TDA1562ST; TDA1562SD Diagnostic output (pin DIAG) DYNAMIC DISTORTION DETECTOR (DDD) At the onset of clipping of the output stages, the DDD becomes active. This information can be used to drive a sound processor or DC-volume control to attenuate the input signal and so limit the distortion. SHORT-CIRCUIT PROTECTION When a short-circuit occurs at the outputs to ground or to the supply voltage, the output stages are switched off. They will be switched on again approximately 20 ms after removing the short-circuit. During this short-circuit condition the diagnostic output is continuously LOW. When a short-circuit occurs across the load, the output stages are switched off during approximately 20 ms. After that time is checked during approximately 50 µs whether the short-circuit is still present. During this short-circuit condition the diagnostic output is LOW for 20 ms and HIGH for 50 µs. The power dissipation in any short-circuit condition is very low. TEMPERATURE DETECTION Just before the temperature protection becomes active the diagnostic output becomes continuously LOW. LOAD DETECTION Directly after the circuit is switched from standby to mute or on, a built-in detection circuit checks whether a load is present. The results of this check can be detected at the diagnostic output, by switching the mode select input in the mute mode. Since the diagnostic output is an open-collector output, more devices can be connected. Fig.4 Diagnostic information. handbook, full pagewidth HIGH MID LOW mode select input diagnostic output output voltage across load 0 HIGH LOW no load clipping signal short-circuit to supply or ground short-circuit across load t MGL265 |
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