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TDA1561Q データシート(PDF) 5 Page - NXP Semiconductors |
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TDA1561Q データシート(HTML) 5 Page - NXP Semiconductors |
5 / 24 page 1997 Aug 14 5 Philips Semiconductors Preliminary specification 2 × 23 W high efficiency car radio power amplifier TDA1561Q FUNCTIONAL DESCRIPTION The TDA1561Q contains two identical amplifiers with differential inputs. At low output power (up to output amplitudes of 3 V (RMS) at VP = 14.4 V), the device operates as a normal SE amplifier. When a larger output voltage swing is needed, the circuit switches internally to BTL operation. With a sine wave input signal the dissipation of a conventional BTL amplifier up to 2 W output power is more than twice the dissipation of the TDA1561Q (see Fig.9). In normal use, when the amplifier is driven with music-like signals, the high (BTL) output power is only needed for a small percentage of time. Under the assumption that a music signal has a normal (Gaussian) amplitude distribution, the dissipation of a conventional BTL amplifier with the same output power is approximately 70% higher (see Fig.10). The heatsink has to be designed for use with music signals. With such a heatsink, the thermal protection will disable the BTL mode when the junction temperature exceeds 145 °C. In this case the output power is limited to 5 W per amplifier. The gain of each amplifier is internally fixed at 32 dB. With the MODE pin, the device can be switched to the following modes: • Standby with low standby current (<50 µA) • Mute condition, DC adjusted • On, operation • SE-only, operation (BTL disabled). The device is fully protected against short-circuiting of the output pins to ground and to the supply voltage. It is also protected against short-circuiting the loudspeaker and high junction temperatures. In the event of a permanent short-circuit condition to ground or the supply voltage, the output stage will be switched off causing a low dissipation. With permanent short-circuiting of the loudspeaker, the output stage will be repeatedly switched on and off. The duty cycle in the ‘on’ condition is low enough to prevent excessive dissipation. To avoid plops during switching from ‘mute’ to ‘on’ or from ‘on’ to ‘mute/standby’ while an input signal is present, a built-in zero-crossing detector allows only switching at zero input voltage. However, when the supply voltage drops below 6 V (e.g. engine start), the circuit mutes immediately avoiding clicks coming from electronic circuitry preceding the power amplifier. The voltage of the SE electrolytic capacitor (pin 11) is always kept at 0.5VP by means of a voltage buffer (see Fig.1). The value of this capacitor has an important influence on the output power in SE mode, especially at low signal frequencies, a high value is recommended to minimize dissipation at low frequencies. |
同様の部品番号 - TDA1561Q |
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同様の説明 - TDA1561Q |
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