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6 / 24 page 2003 Feb 12 6 Philips Semiconductors Preliminary specification 70 W high efficiency power amplifier with diagnostic facility TDA1562Q; TDA1562ST; TDA1562SD FUNCTIONAL DESCRIPTION The TDA1562 contains a mono class-H BTL output power amplifier. At low output power, up to 18 W, the device operates as a normal BTL amplifier. When a larger output voltage swing is required, the internal supply voltage is lifted by means of the external electrolytic capacitors. Due to this momentarily higher supply voltage the obtainable output power is 70 W. In normal use, when the output is driven with music-like signals, the high output power is only needed during a small percentage of time. Under the assumption that a music signal has a normal (Gaussian) amplitude distribution, the reduction in dissipation is about 50% when compared to a class-B output amplifier with the same output power. The heatsink should be designed for use with music signals. If the case temperature exceeds 120 °C the device will switch back from class-H to class-B operation. The high power supply voltage is then disabled and the output power is limited to 20 W. When the supply voltage drops below the minimum operating level, the amplifier will be muted immediately. Mode select input (pin MODE) This pin has 3 modes: 1. LOW for standby: the complete circuit is switched off, the supply current is very low 2. MID for mute: the circuit is switched on, but the input signal is suppressed 3. HIGH for on: normal operation, the input signal is amplified by 26 dB. When the circuit is switched from mute to on or vice versa the actual switching takes place at a zero crossing of the input signal. The circuit contains a quick start option, i.e. when it is switched directly from standby to on, the amplifier is fully operational within 50 ms (important for applications like car telephony and car navigation). Status I/O (pin STAT) INPUT This input has 3 possibilities: 1. LOW for fast mute: the circuit remains switched on, but the input signal is suppressed 2. MID for class-B: the circuit operates as class-B amplifier, the high power supply voltage is disabled, independent of the case temperature 3. HIGH for class-H: the circuit operates as class-H amplifier, the high power supply voltage is enabled, independent of the case temperature. When the circuit is switched from fast mute to class-B/H or vice versa the switching is immediately carried out. When the circuit is switched from class-B to class-H or vice versa the actual switching takes place at a zero crossing of the input signal. OUTPUT This output has 3 possibilities: 1. LOW for mute: acknowledge of muted amplifier 2. MID for class-B: the circuit operates as class-B amplifier, the high power supply voltage is disabled, caused by the case temperature Tc > 120 °C 3. HIGH for class-H: the circuit operates as class-H amplifier, the high power supply voltage is enabled, because the case temperature Tc < 120 °C. When the circuit is switched from class-B to class-H or vice versa the actual switching takes place at a zero crossing of the input signal. The status I/O pins of maximum 8 devices may be tied together for synchronizing purposes. |
Số phần tương tự - TDA1562SD |
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Mô tả tương tự - TDA1562SD |
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