isl6590dr Intersil Corporation, isl6590dr Datasheet - Page 16

• Manufacturer Part Number: isl6590dr
• Description: Digital Multi-phase Pwm Controller For Core-voltage Regulation
• Manufacturer: Intersil Corporation

Adjusting The Digital PID
Frequency response of the digital PID compensator is
determined by the Kp, Ki, Kd factors. These factors are
stored in nonvolatile memory and are loaded in the controller
at power on reset. The system designer sets the PID
compensators frequency response using user interface
software. The designer enters the frequencies of the
desired poles and zeros and user interface software
calculates the Kp, Ki and Kd factors. the software will
calculate and display the frequency response of the
feedback and the closed loop system.
FIGURE 17. DESIGN PARAMETER INPUT WINDOW
FIGURE 16. DIGITAL PID COMPENSATOR
16
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ISL6590
F
F
F
F
R
C
F
The software will calculate the frequency response of the
PID controller and the closed loop system as in figures 20
and 21 below.
Z1
Z2
P0
P1
P2
P2
P2
= Frequency of first zero
= Frequency of second zero
= Gain * frequency of first pole (A
= Frequency of second pole
= 1 / (2 * 5* R
= External Resistor used for third pole
= External Capacitor used for third pole
FIGURE 18. SMALL SIGNAL DESIGN WINDOW
P2
FIGURE 19. BODE PLOT
* C
P2
)
DC
*F
P0
)