Information subject to change
97-2105006_4-2-15
2105 OPERATOR’S MANUAL –
SECTION 6
26
Figure 6.4 – Custom Compensation Location
To begin testing, input a square wave with a fre
-
quency of 100 Hz to 1 kHz, or a squared pulse at a
low level (typically 0.25 to 2.0 volts). A limited-rise-
time, repetitive pulse of low duty cycle is preferred.
Observe the output current through a current
monitor or current probe. Look for clean transition
edges. The presence of ringing or rounding on the
transition edges indicates compensation problems.
(See
Figure 6.5
.)
Figure 6.5 – Compensation Effects on Waveform
Figure 6.6 – Square Wave Showing a
Decrease in R is Required
Figure 6.7 – Square Wave Showing an
Increase in R is Required
Figure 6.8 – Square Wave Showing an
Increase in C is Required
If a change in compensation is necessary, an ad
-
justment to the resistor component of the Compen-
sation circuit is probably required.
If the output current waveform is ringing, the circuit
is underdamped: You have too much gain and
should lower the resistance (see
Figure 6.6
).
If the output current waveform is rounded, the
circuit is overdamped: You have too little gain and
should increase resistance (see
Figure 6.7
).
If the output current waveform is neither under-
damped or overdamped, but the top of the square
-
wave is not level, then you should instead increase
the capacitor value (see
Figure 6.8
).
