CURRENT SWITCHING AMPLIFIER
14
CEDRAT TECHNOLOGIES
Current Switching Amplifier
18/12/2017
Character
Description
Parameter range
Example
‘A’
This command prints the current parameters.
0-255
Value is a ‘don’t
care’
‘A1E’
‘P’
Sets the proportional term P of the PI controller
0-235
‘P150E’
Sets the proportional
gain to 150.
‘I’
Sets the integral term I of the PI controller
8310-96700
‘I13300E’
Sets the integral gain
to 13300.
P and I command are made to be intelligible and proportional gains to usual Kp and Ki gain. Internally, those
values are 8bits values, some differences may appears between entered values and effective values.
The internal current loop is presented in the Figure 4.
When a parameter of the CSA96 is modified, the new parameter value is automatically saved in a non-volatile
memory. The parameters of the CSA96 are automatically recalled on startup, so that the user does not have
to reconfigure the board on every power-up.
Since those commands write the memory, their execution time is longer.
Figure 4. Internal current loop diagram.
7.4.
OPTOCOUPLERS
The series resistance of the enable optocoupler (Figure 2) has been set to allow enabling the amplifier with a
digital voltage of 5V without adding any component. In this case, the current needed is 12mA. A digital
command with a higher voltage is possible but needs the use of a higher series resistance which has to be
P
0…235
I
8.3k…93k
Act
Vbus/6.2
0.056A/V
Ampli
Corrector
Gain
Delay
~1/50kHz
120kHz
0.112
Current
I
47
Order
