A3
Pin #
Function
Description
Signal
Type
Level when
Asserted
Level when
Deasserted
Notes
Applications
20
I SUM1–
Multiple Amplifier
Summing, Ampli
-
fier 1
DC
Planned for use in multiple amplifier
configurations - paralleled and run
-
ning Controlled Current Mode
Currently not used.
21
I SUM2–
Multiple Amplifier
Summing, Ampli
-
fier 2
DC
Planned for use in multiple amplifier
configurations - paralleled and run
-
ning Controlled Current Mode
Currently not used.
22
I SUM3–
Multiple Amplifier
Summing, Ampli
-
fier 3
DC
Planned for use in multiple amplifier
configurations - paralleled and run
-
ning Controlled Current Mode
Currently not used.
23
OverLoad Out Overload output
(amplifier output is
clipping).
DC
–24V
0V
When amp is normal, this pin
is pulled to –24V through a
47.5K-ohm resistor; when amp is in
Overload state, this pin is ground
-
ed. Do not exceed 6 milliamps.
Remote Signal of Overload Condition:
LED, when lit,
signals Overload condition. Use a 6mA series resistor
of 4.7K-ohm for LED or OPTO, tie to –24V source (PIN
13).
24
OverVoltage
Out
Overvoltage output
(High AC line volt
-
age).
DC
–24V
0V
When amp is normal, this pin
is pulled to –24V through a
47.5K-ohm resistor; when amp
is in Overvoltage state, this pin
is grounded. Do not exceed 6
milliamps.
Remote Signal of Overvoltage Condition:
LED, when
lit, signals Overvoltage condition. Use a 6mA series re
-
sistor of 4.7K-ohm for LED or OPTO, tie to –24V source
(PIN 13).
25
Reset
Reset
DC
–15V
0V
Tie to PIN 13 (–24V dc) and create
a –15V dc source; <2mA required
for reset. Connect the –15V dc
source to PIN 25 (Reset) through a
1K buffer resistor to reset.
Reset from Standby:
Use a dry contact switch and
voltage regulator to return amp to Ready/Run condition
after Overload conditions. Assert –15V for at least 100
ms to clear error condition.
Gray shaded areas indicate pin not used / feature not implemented.
Blue shaded areas indicate used only in multi-amplifier systems.
Summary of Contents for 7548
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