
General Purpose Power Supply (GPDPS) 6 Device PowerSupply
System Reference, January 2001
145
– Load C 4µF to < 20µF selects the performance range
2
–Load C 20µF to < 100µF selects the performance
range 3
–Load C ≥ 100µF selects the performance range 4
Note: It is also possible to set or change the
performance range in your device setup with the
firmware command PSCL:
PSCL <performance range>, (<Pinlist>)
<performance range> := 1, 2, 3, 4
Dynamic Load Performance Considerations
The sense line monitors the DPS voltage level and the
control logic regulates the current so as to maintain the
desired DPS voltage level.
The response time of the control loop to changes in the
load conditions is small but not zero. To buffer the supply
voltage level immediately after a change in the load condi-
tions, a load capacitance is needed. This load capacitance
ensures stable operation of the GPDPS control loop. It acts
as a low pass filter, stabilizing the supply voltage.
The following parameters influence the dynamic perfor-
mance of the GPDPS channel:
• performance range
The higher the performance range, the higher the open
loop gain of the GPDPS control loop. In a higher perfor-
mance range the GPDPS can better react to higher
current swings without introducing high supply
voltage ripples. On the other hand, higher performance
ranges require higher load capacitances.
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