ncp5392p ON Semiconductor, ncp5392p Datasheet - Page 22

• Manufacturer Part Number: ncp5392p
• Description: 2/3/4-phase Controller For Cpu Applications
• Manufacturer: ON Semiconductor

Dynamic VID Testing
Intel Requirements. Select the Dynamic VID option.
Before enabling the test set the lowest VID to 0.5 V or
greater and set the highest VID to a value that is greater than
the lowest VID selection, then enable the test. See Figures
7 and 8.
Design Methodology
Decoupling the V
minimize supply noise on the IC. The resistor should be
sized such that it does not generate a large voltage drop
between 5 V supply and the IC.
The VTT tool provides for VID stepping based on the
An RC input filter is required as shown in the V
Figure 7. 1.6 V to 0.5 V Dynamic VID response
Figure 8. Dynamic VID Settling Time Rising
(CH1: VID1, CH2: DAC, CH3:VCCP)
CC
Pin on the IC
CC
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pin to
NCP5392P
22
Understanding Soft-Start
AMD ramp to the initial VID code, or a VR11 Ramp to the
1.1 V boot voltage, with a pause to capture the VID code
then resume ramping to target value based on internal slew
rate limit. The initial ramp rate was set to be 0.8 mV/mS.
Programming the Current Limit and the Oscillator
Frequency
approximately 330 kHz. The R
reference voltage which is divided down with a resistor
divider and fed into the current limit pin ILIM. Then
calculate the individual RLIM1 and RLIM2 values for the
divider. The series resistors RLIM1 and RLIM2 sink
current from the ILIM pin to ground. This current is
The controller supports two different startup routines. An
The demo board is set for an operating frequency of
Figure 9. VR11.1 Startup
Figure 10. AMD Startup
OSC
pin provides a 2.0 V