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參數(shù)資料
| 型號(hào)： | 935260594112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 70 W, 1 CHANNEL, AUDIO AMPLIFIER, PZIP17 |
| 封裝： | POWER, PLASTIC, SOT-243-1, DIL-BENT-SIL, 17 PIN |
| 文件頁(yè)數(shù)： | 19/23頁(yè) |
| 文件大小： | 163K |
| 代理商： | 935260594112 |
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1998 Apr 07
5
Philips Semiconductors
Preliminary specication
70 W high efciency power amplier
with diagnostic facility
TDA1562Q
FUNCTIONAL DESCRIPTION
The TDA1562Q 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, ‘standby’: the complete circuit is switched off,
the supply current is very low
2. MID, ‘mute’: the circuit is switched on, but the input
signal is suppressed
3. HIGH, ‘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 input (pin STAT)
INPUT
This input has 3 possibilities:
1. LOW, ‘fast mute’: the circuit remains switched on, but
the input signal is suppressed
2. MID, ‘class-B’: the circuit operates as class-B
amplifier, the high power supply voltage is disabled,
independent of the case temperature
3. HIGH, ‘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, ‘mute’: acknowledge of muted amplifier
2. MID, ‘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, ‘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.
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