97-7796264_09-04-2020
Information subject to change
27
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5
resistive values of the load will determine the
required compensation values. While the factory-
default compensation setting will be sufficient
for some applications, the compensation setting
may also be adjusted in the field. The following
section describes methods for determining and
setting proper compensation when operating in
Controlled-Current mode.
5.2.3 Controlling Compensation for
CC Operation
AE Techron 7548/7794/7796/7796HC amplifiers
can be configured for either Controlled Voltage
(CV) or Controlled Current (CC) mode of opera
-
tion. When operating the amplifier in Controlled
Voltage (CV) mode, compensation is not required.
However, when operating in Controlled Current
(CC) mode, the amplifier load becomes an inte
-
gral part of the system. In order to ensure sys
-
tem stability and to control available bandwidth,
compensation via an RC network is required for
CC operation. The following steps will allow you
to compensate your amplifier for operation in CC
mode safely and effectively.
Figure 5.9 – Factory-installed Default RC Network
We recommend that you power-up and enable the
amplifier in Controlled Voltage mode without at
-
taching a load before configuring your amplifier for
Controlled Current operation. This will allow you
to verify that the input signal and the amplifier are
operating correctly.
Once this initial check is completed, power down
the amplifier and access the amplifier main board
to place the amplifier in CC mode. (Refer to the
Advanced Configuration
section for more infor-
mation.)
One of two compensation settings can be selected
via jumpers on the main board: CC1 which en
-
ables the factory-installed RC network (see
Figure
5.9
), or CC2 which allows installation of a custom
RC network.
STEP 1: Check Amplifier Operation in CV mode.
STEP 2: Determine Required Compensation.
When operating an amplifier in Controlled Cur
-
rent mode, the load becomes an integral part of
the system. In order to determine the required
compensation for your load, begin by consulting
the following table to determine the approximate
compensation capacitance (C) required based on
the inductance of your load:
Load Inductance (L)
<200 µH
<>200 µH – <1 mH
>1 mH
Compensation Capacitance (CC)
0.001 µF
0.01 µF
0.1 µF
NOTE: Load Resistance (R) is assumed to be
<5 ohms.
Summary of Contents for 7548
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