TDA1562 Philips Semiconductors, TDA1562 Datasheet - Page 7

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

Philips Semiconductors
Diagnostic output (pin DIAG)
D
At the onset of clipping of the output stages, the DDD
becomes active. This information can be used to drive a
sound processor or DC-volume control to attenuate the
input signal and so limit the distortion.
S
When a short-circuit occurs at the outputs to ground or to
the supply voltage, the output stages are switched off.
They will be switched on again approximately 20 ms after
removing the short-circuit. During this short-circuit
condition the diagnostic output is continuously LOW.
When a short-circuit occurs across the load, the output
stages are switched off during approximately 20 ms. After
that time is checked during approximately 50 s whether
the short-circuit is still present. During this short-circuit
condition the diagnostic output is LOW for 20 ms and high
for 50 s. The power dissipation in any short-circuit
condition is very low.
1998 Apr 07
handbook, full pagewidth
HORT
YNAMIC
70 W high efficiency power amplifier
with diagnostic facility
-
CIRCUIT PROTECTION
output voltage
D
mode select
across load
diagnostic
ISTORTION
output
input
HIGH
HIGH
LOW
LOW
D
MID
ETECTOR
0
no load
(DDD)
clipping signal
Fig.4 Diagnostic information.
7
T
Just before the temperature protection becomes active the
diagnostic output becomes continuously LOW.
Load detection: directly after the circuit is switched from
standby to mute or on, a build in detection circuit checks
whether a load is present. The results of this check can be
detected at the diagnostic output, by switching the mode
select input in the mute mode.
Since the diagnostic output is an open collector output,
more devices can be tied together.
supply or ground
short-circuit to
EMPERATURE DETECTION
short-circuit
across load
TDA1562Q
Preliminary specification
MGL265
t