TDA1562 Philips Semiconductors, TDA1562 Datasheet - Page 5

• Manufacturer Part Number: TDA1562
• Description: 70 W high efficiency power amplifier with diagnostic facility
• Manufacturer: Philips Semiconductors

Philips Semiconductors
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,
2. MID, ‘mute’: the circuit is switched on, but the input
3. HIGH, ‘on’: normal operation, the input signal is
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).
1998 Apr 07
70 W high efficiency power amplifier
with diagnostic facility
the supply current is very low
signal is suppressed
amplified by 26 dB.
5
Status I/O input (pin STAT)
I
This input has 3 possibilities:
1. LOW, ‘fast mute’: the circuit remains switched on, but
2. MID, ‘class-B’: the circuit operates as class-B
3. HIGH, ‘class-H’: the circuit operates as class-H
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.
O
This output has 3 possibilities:
1. LOW, ‘mute’: acknowledge of muted amplifier
2. MID, ‘class-B’: the circuit operates as class-B
3. HIGH, ‘class-H’: the circuit operates as class-H
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.
NPUT
UTPUT
the input signal is suppressed
amplifier, the high power supply voltage is disabled,
independent of the case temperature
amplifier, the high power supply voltage is enabled,
independent of the case temperature.
amplifier, the high power supply voltage is disabled,
caused by the case temperature T
amplifier, the high power supply voltage is enabled,
because the case temperature T
Preliminary specification
c
< 120 C.
TDA1562Q
c
> 120 C