A2
Pin #
Function
Description
Signal
Type
Level when
Asserted
Level when
Deasserted
Notes
Applications
10
Sampled
Common
Amp Analog
Ground; Blanking
Ground
Amplifier ground.
Can be used as Blanking return or as a reference of the
amplifier for status reporting applications. See Over
-
Temp (PIN 11), Run (PIN 12), Overload (PIN 23), and
OverVoltage (PIN 24).
11
OverTemp
Out
Over-temperature
output
DC
–24V
0V
When amp is normal, this pin
is pulled to –24V through a
47.5K-ohm resistor; when amp is in
OverTemp state, this pin is ground
-
ed. Do not exceed 7 milliamps.
Remote Signal of Over-Temperature Condition:
LED,
when lit, signals Over Temperature condition. Use a 6
mA series resistor of 4.7K-ohm for LED or OPTO, tie to
–24V source (PIN 13).
12
Run
Amplifier Run output
DC
–24V
0V
When amp is in Standby mode, this
pin is pulled to –24V; when amp is
in Run mode, this pin is grounded,
energizing Mains Relays and allow
-
ing drive for an external LED.
DO NOT exceed 7mA; DO NOT
ground this pin as this will enable
Main Power Relays.
Remote Signal of Run Condition:
LED, when lit, sig
-
nals Run state. Use a 6mA series resistor of 4.7K-ohm
for LED or OPTO, tie to –24V source (PIN 13).
13
–24V
–24V Power Output
DC
–24V dc, 30 mA max
Internally tied for use in status reporting applications.
See OverTemp (PIN 11), Run (PIN 12), Overload (PIN
23), and OverVoltage (PIN 24).
14
Common
Ground before
Sense Resistors
Current monitor reference. Voltage
between Common and Sampled
Common is voltage on the Current
Sense resistor.
Possibly series amplifiers will not need current reporting
on the High side amp, since its current will be same as
Master.
15
–1 IN
Differential Follower
Input
AC or
DC
Up to 200V
peak
0V
Only used in multiple amplifier
configurations, Series mode.
Can accept output of PIN 1 (Amplifier Output) OR PIN
2 (Sampled Common) from Master device when in
Follower mode.
16
+24V
+24V Power Output
DC
+24V dc, 30 mA max.
Used in status reporting applications. See OverTemp
(PIN 11), Run (PIN 12), Overload (PIN 23), and Over
-
Voltage (PIN 24).
17
Digital Ground Digital circuitry
ground - Interlock
Common
DC
0V
0V
Used with PIN 25 (Reset) for Remote Reset from
Standby or Stop after Error. Used with PIN 4 (Interlock)
for simultaneous remote to Standby of all amps in a
multi-amplifier system.
18
OEM App
Input Monitor (OEM
only)
Used to monitor the input signal
from an OEM DAC card; this is the
actual input signal.
OEM modification only; normally no connection.
19
I MON –
(alt.: OEM
App)
Differential Current
Monitor – ;
(- Input Monitor,
OEM only)
AC or
DC
7212/7224/
7226:
5A/V
7548/7794/
7796/7796HC:
20A/V
Inverted I MON+ (PIN 6). Output
current produced per voltage
detect.
Current Monitoring:
Connect a voltage meter to
monitor the output current being produced by the
amplifier. For each 1V detected, current output is 5A
(7212/7224/7226) or 20A (7548/7794/7796/7796HC).
Summary of Contents for 7548
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