Powersolve High Speed Programming Option - Manual (Page 2)

SM-high speed
Page 1 - 2 SPECIFICATIONS 2005, rev. Oct. 2010
Description:
• The SM-Series with the High Speed Programming Options are optimized for maximum programming speed. The speed is about 10 -20 times
higher compared to the standard version.
• To achieve the high speed, the output capacitance has been made much smaller. Because of the smaller capacitors, the output ripple voltage is
higher, but this is generally no problem for applications requiring high speed.
• The low output capacitance and the fast control results in relatively low current overshoots (if any) in case of sudden voltage variations caused by
the load, this is of great advantage for laserdiode applications…
Applications:
• Laser diode power supply, continuous or pulsed
• Test systems requirements a fast settings time to improve t
hrough put of factory.
• A constant current source with a low parallel capacitance : plasma, load sensitive to current overshoots, ect.
• A constant current source on a load with a fast voltage variations.
Recommendations:
• Use low inductive cabling, specially for higher currents.
The inductance of the connecting cables (between the power supply and the load) can cause overshoots and slowdown of the rise and fall times.
A low inductive cable can be constructed by using multiple isolated strands for the plus and minus wires and by bundling the combination of the
mixed plus and minus wires. Each plus wire should be close to a minus wire (see picture below), For lower currents it can be sufficient to tie the
plus and minus wires very close to each other.
• Depending on the load impedance, the series inductance of the cables and the parallel capacitance of the power supply can make a resonant
circuit, causing ringing and overshoots. Note that the voltage and current control of the power supply has little influence on this effect, because it
is outside the control loop. To overcome this problem, connect an RC-filter to the head, to damp the circuit.
• When using analog programming, take care that the programming source is fully floating.
In case of a non-floating source, the power supply should be equipped with a ISO AMP CARD.
When the source is not sufficiently floating, it could result in distorted waveforms.
• Remote sensing is not recommended.
An ISO AMP CARD should be used in case of a
non-float ing pro gram ming source.
Low Inductance Ca ble cross section