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ZL9117M
Coincident: This mode configures the ZL9117M to ramp its
output voltage at the same rate as the voltage applied to the
VTRK pin. Two options are available for this mode;
a.Track at 100% VOUT limited. Member rail tracks the reference
rail and stops when the member reaches its target voltage,
Figure 15A.
b. Track at 100% VTRK limited. Member rail tracks the reference
at the instantaneous voltage value applied to the VTRK pin,
Figure 15B.
latch-up. Multi-device sequencing can be achieved by configuring
each device through the I 2 C/SMBus interface.
Multiple device sequencing is configured by issuing PMBus
commands to assign the preceding device in the sequencing
chain as well as the device that follows in the sequencing chain.
The Enable pins of all devices in a sequencing group must be tied
together and driven high to initiate a sequenced turn-on of the
group. Enable must be driven low to initiate a sequenced turnoff
of the group.
0
Coincident Tracking
Track @ 1 00% Vout Limited
Vref > Vmem VR ef
To n Dly To ff D ly
Vm em
Vref =1.8V
Vmem=0.9V
Refer to Application Note AN2033 for details on sequencing via
the I 2 C/SMBus interface.
Fault Spreading
A.
0
B.
EN
Track @ 100% Vtrk Limited
Vref = Vmem V R ef
Ton Dly
EN
T off D ly
V mem
Vref =1.8V
Vmem=1.8V
?
Digital DC modules and devices can be configured to broadcast a
fault event over the DDC bus to the other devices in the group.
When a non-destructive fault occurs and the device is configured
to shut down on a fault, the device shuts down and broadcasts
the fault event over the DDC bus. The other devices on the DDC
bus shut down simultaneously, if configured to do so, and
attempt to re-start in their prescribed order, if configured to
V IN
FIGURE 15. COINCIDENT TRACKING
Ratiometric: This mode configures the ZL9117M to ramp its
output voltage as a percentage of the voltage applied to the
VTRK pin. The default setting is 50%, but an external resistor or
PMBus command may be used to configure a different tracking
ratio.
a.Track at 50% VOUT limited. Member rail tracks the reference
rail and stops when the member reaches 50% of the target
voltage, Figure 16A.
b.Track at 50% VTRK limited. Member rail tracks the reference at
the instantaneous voltage value applied to the VTRK pin until the
member rail reaches 50% of the reference rail voltage, or if the
member is configured to less than 50% of the reference the
member will achieve its configured target, Figure 16B. Refer to
Application Note AN2033 for further details.
Ratiom etric Tracking
do so.
Active Current Sharing
Paralleling multiple ZL9117M modules can be used to increase
the output current capability of a single power rail. By connecting
the DDC pins of each module together and configuring the
modules as a current sharing rail, the units share the current
equally within a few percent. Figure 17 illustrates a typical
connection for two modules.
.
3.3V TO 5V
C IN
DDC ZL9117M
C OUT
V R ef
0
Tra ck @ 50% Vou t Limited
Vref = 1.8V
Vmem = 0.9 V
To n Dly
Toff Dly
V me m
Vref=1.8V
Vmem=0.9V
DDC ZL9117M
C IN
V OUT
A.
0
B.
EN
Track @ 50% V trk Limited
V ref = 1.8V V ref
V mem = 0.8 V
To n Dly
EN
Toff Dly
Vm em
Vref=1.8V
Vmem=0.8V
?
C OUT
FIGURE 17. CURRENT SHARING GROUP
The ZL9117M uses a low-bandwidth, first-order digital current
sharing technique to balance the unequal module output loading
by aligning the load lines of member modules to a reference
FIGURE 16. RATIOMETRIC TRACKING
Output Sequencing
A group of Digital-DC modules or devices may be configured to
power-up in a predetermined sequence. This feature is especially
useful when powering advanced processors, FPGAs and ASICs
that require one supply to reach its operating voltage; prior to
another supply reaching its operating voltage in order to avoid
14
module.
Droop resistance is used to add artificial resistance in the output
voltage path to control the slope of the load line curve,
calibrating out the physical parasitic mismatches due to power
train components and PCB layout.
Upon system start-up, the module with the lowest member
position as selected in ISHARE_CONFIG is defined as the
FN7914.3
July 22, 2013
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