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TDA1564J Scheda tecnica(PDF) 6 Page - NXP Semiconductors |
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TDA1564J Scheda tecnica(HTML) 6 Page - NXP Semiconductors |
6 / 30 page 2004 Jan 27 6 Philips Semiconductors Preliminary specification High efficiency 2 × 25 W/4 Ω stereo car radio power amplifier TDA1564 TDA1564TH VP1 n.c. CIN MODE IN1 − OUT1 − IN1 + OUT1 + CSE GND1 DIAG GND2 IN2 + OUT2 − IN2 − OUT2 + OC1 OC2 VP2 n.c. 001aaa307 20 19 18 17 16 15 14 13 12 11 9 10 7 8 5 6 3 4 1 2 Fig.3 Pin configuration (TDA1564TH). handbook, halfpage TDA1564J MGW245 IN1 + IN1 − CIN CSE VP1 MODE OUT1 − OUT1 + GND OUT2 − OUT2 + OC2 VP2 OC1 DIAG IN2 − IN2 + 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Fig.4 Pin configuration (TDA1564J). FUNCTIONAL DESCRIPTION The TDA1564 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 TDA1564 (see Fig.12). 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. Assuming 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 Figs 13 and 14. 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 150 °C. In this case, the output power is limited to 5 W per amplifier. The gain of each amplifier is internally fixed at 26 dB. The device can be switched to the following modes via the MODE pin: • Standby with low standby current (< 50 µA) • Mute condition, DC adjusted • On, operation. The device is fully protected against a short-circuit of the output pins to ground and to the supply voltage. It is also protected against a short-circuit of the loudspeaker and against 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 low dissipation. With a permanent short-circuit of the |
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