NCP5393 ON Semiconductor, NCP5393 Datasheet - Page 17

• Manufacturer Part Number: NCP5393
• Description: 2/3/4-Phase Controller
• Manufacturer: ON Semiconductor

www.DataSheet4U.com
Hardware Jumper Override - V_FIX
controller enters V_FIX mode.The voltage regulator can be
powered when an external SVI bus master is not present.
When in VFIX mode, all of the voltage regulator's output
voltages will be governed by the information shown in
Table 3, regardless of the state of PWROK. VFIX mode is
for debug and bring-up only. If VFIX mode is necessary for
processor bring-up, VFIXEN, SVC, and SVD should be
connected with jumpers to either ground or VDDIO through
suitable pull-up resistors. SVC and SVD are considered as
static VID and the output voltage will change according to
their status.
•
Table 3. SVI VFIX VID CODES (TWO-BIT PARALLEL)
VFIX is an active low pin and when it is pulled low, the
Start-up sequences are presented below:
Boot VID is captured from SVC and SVD pins on
rising edge of ENABLE.
SVC
0
0
1
1
SVD
0
1
0
1
Figure 11. Power Up Sequences Before and After Soft Start in SVI Mode
V
OUT
1.4
1.2
1.0
0.8
(V)
http://onsemi.com
NCP5393
17
•
•
•
PWROK De-assertion
controller uses the previously stored BOOT VID and
regulates all planes to that level performing an on-the-Fly
transition to that level. PWRGOOD remains asserted in this
process.
Anytime PWROK de-asserts while EN is asserted, the
This capture is INDEPENDENT of any other signal.
SVI/PVI is determined by sampling VID[1] during
rising edge of ENABLE (SVI: VID[1]=0, PVI:
VID[1]=1). Once SVI/PVI is determined, the VID
controller is enabled and increments to the Boot VID at
the Soft Start rate. VFIXEN mode is entered once
VFIXEN is asserted.
If VFIXEN is asserted prior to the VID controller
reaching the Boot VID, the VID controller will move to
the VFIXEN VID. Once the first VID value is reached
(either BOOT VID or VFIXEN VID), the VID will
now increment at the Normal rate. Once the VID
controller is enabled, the VID controller can receive
VFIXEN VIDs, independent of PWROK which is
ignored in VFIXEN mode.
If VFIXEN is de-asserted, the device PORs. This
occurs independent of ENABLE