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TDA1565TH 데이터시트(PDF) 5 Page - NXP Semiconductors |
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TDA1565TH 데이터시트(HTML) 5 Page - NXP Semiconductors |
5 / 27 page 2004 Jan 27 5 Philips Semiconductors Product specification High efficiency 2 × 40 W / 2 Ω stereo car radio power amplifier TDA1565TH FUNCTIONAL DESCRIPTION The TDA1565TH contains two identical amplifiers with differential inputs. At low output power (output amplitudes of up to 3 V (RMS) at VP = 14.4 V), the device operates as a normal SE amplifier. When a larger output voltage swing is required, the circuit automatically switches internally to BTL operation. With a sine wave input signal, the power dissipation of a conventional BTL amplifier with an output power of up to 3 W is more than twice the power dissipation of the TDA1565TH (see Fig.10). During normal use, when the amplifier is driven by typical variable signals such as music, 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 power dissipation of a conventional BTL amplifier with the same output power is approximately 70 % higher (see Fig.11). The heatsink must be designed for music signal operation. When such a heatsink is used, the IC’s thermal protection will disable the BTL mode when the junction temperature exceeds 150 °C. In this case the output power is limited to 10 W per amplifier. The gain of each amplifier is internally fixed at 26 dB. The device can be switched to any of the following modes by applying the appropriate voltage to the MODE pin (see Fig.3): • Standby with low standby current (less than 50 µA) • Mute condition; DC adjusted • On, operation. The device is fully protected against a short-circuit of the output pins to ground or to the supply voltage. It is also protected against a loudspeaker short-circuit and against high junction temperatures. In the event of a permanent short-circuit condition, the output stage is repeatedly switched on and off with a low duty-cycle resulting in low power dissipation. When the supply voltage drops below 6 V (e.g. vehicle engine start), the circuit is immediately muted to prevent audible ‘clicks’ that may be produced in the electronic circuitry preceding the power amplifier. The voltage across the SE electrolytic capacitor connected to pin 16 is kept at 0.5 VP by a voltage buffer (see Fig.1). The capacitor value has an important influence on the output power in SE mode, especially at low frequency signals; a high value is recommended to minimize power dissipation at low frequencies. The diagnostic output indicates the following conditions: • Clip detection at 2.5 % THD (see Fig.4) • Short-circuit protection (see Fig.5): – When an output short-circuit occurs (for at least 10 µs); the output stages are switched off for approx. 500 ms, after which time the outputs are checked to see if a short-circuit condition still exists. During any short-circuit condition, the power dissipation is very low. During a short-circuit condition pin DIAG is at logic LOW. • Start-up/shutdown; when the product is internally muted • Thermal protection pre-warning: – If the junction temperature rises above 145 °C but is below the thermal protection temperature of 150 °C, the diagnostic output indicates that the thermal protection condition is about to become active. This pre-warning can be used by another device to reduce the amplitude of the input signal which would reduce the power dissipation. The thermal protection pre-warning is indicated by a logic LOW at pin DIAG. handbook, halfpage MGR176 18 VMODE (V) 4 3 2 1 0 Mute Operating Standby Fig.3 Switching levels of the mode select pin (pin MODE). |
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