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TDA1565TH 데이터시트(PDF) 5 Page - NXP Semiconductors

부품명 TDA1565TH
상세설명  High efficiency 2 x 40 W / 2 ohm stereo car radio power amplifier
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA1565TH 데이터시트(HTML) 5 Page - NXP Semiconductors

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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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