Voltage Regulator-Down (VRD) 10.0

Processor Voltage Requirements
R
34 VRD Design Guide
2.9.2 Example: Socket Vcc Overshoot Test
To pass the overshoot specification, the amplitude constraint of Equation 1 and time duration
requirement of TOS_MAX must be satisfied. This example references Figure 14.
Amplitude Test Constraint: Overshoot amplitude, VOS, must be less than Vzc + VOS_MAX
Input parameters
VOS= 1.325 V – Obtained from direct measurement
V
ZC
= 1.285 V – Obtained from direct measurement
VOS_Max = 0.050 V – An Intel specified value
Amplitude Analysis:
V
ZC
+ VOS_MAX = 1.285 V + 0.050 V = 1.335 V
VOS = 1.325 < 1.335 V
Amplitude Test Satisfied
Time Duration Test Constraint: Overshoot duration above Vzc must be less than 25 µs
Input Parameters
Initial crossing of overshoot: 15 µs – Obtained from direct measurement
Final crossing of overshoot: 35 µs – Obtained from direct measurement
TOS_MAX = 25µs – An Intel specified value
Overshoot Duration Analysis
TOS = Final Crossing of Vzc – Initial Crossing of Vzc
TOS = 35 µs – 15 µs = 20 µs < 25 µs = TOS_MAX
Time duration test passed
Amplitude Test Passed & Time Duration Test Passed => Overshoot specification is satisfied