Rainbow Electronics MAX8707 - Manual (Page 25)

MAX8707
Multiphase, Fixed-Frequency Controller for
AMD Hammer CPU Core Power Supplies
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SUS
VROK
INTERNAL
PWM CONTROL
DRSKP
FORCED-PWM AUTO 1-PHASE SKIP
PWM1
PWM2
PWM3
PWM4
NOTE: OVP CONSTANTLY TRACKS THE INTERNAL TARGET, AND THE INTEGRATOR (CCV) IS CONSTANTLY ENABLED.
CPU CORE
VOLTAGE
SUSV
VID
FORCED-PWM
HIGH-Z LOW THRESHOLD ONLY HIGH-Z
t BLANK
20 µ s typ
t BLANK
20
µ
s typ
Figure 4. Suspend Transition in Forced-PWM Mode (SKIP = low)
SKIP = SUS
VROK
INTERNAL
PWM CONTROL
DRSKP
1-PHASE SKIP FORCED PWM
PWM1
PWM2
PWM3
PWM4
OVP/CCV
CPU CORE
VOLTAGE
SUSV
VID
t BLANK
20 µs
t BLANK
20 µs
ACTUAL V OUT
TARGET
OVP = 1.8V INTEGRATOR DISABLED
OVP TRACKS INTERNAL TARGET
INTEGRATOR ENABLED
LOW VROK THRESHOLD ONLY HIGH-Z HIGH-Z
Figure 5. Suspend Transition in Pulse-Skipping Operation (SKIP = SUS)