zm7100 Power-One, zm7100 Datasheet - Page 19

• Manufacturer Part Number: zm7100
• Description: Zm7100 Series Digital Power Manager
• Manufacturer: Power-One

ZM7100 Series Digital Power Manager
Data Sheet
propagation of faults and errors between groups. One DPM can manage up to four independent groups of POL
converters: A, B, C, and D, depending on the model.
Group management includes fault and error propagation, margining, turn-on and turn-off, monitoring setup, and
interrupt configuration.
10.3.1
Fault and Error Propagation
To enable fault and error propagation between groups, the respective bit needs to be checked in the GUI Fault
and Error Propagation window shown in Figure 13.
Figure 13. Fault and Error Propagation Window
2
The parameters can also be programmed directly via the I
C bus by writing into the FPC1, FPC2, and EPC
registers shown in Figure 14, Figure 15, and Figure 16, respectively.
When propagation is enabled, the faulty POL converter pulls its OK pin low. A low OK line initiates turn-off of other
POL converters in the group and signals the DPM to pull other OK lines low to initiate turn-off of other POL
converters as programmed.
Propagation of a fault (overcurrent, undervoltage, overtemperature, and tracking) between groups initiates regular
turn-off of other POL converters. The faulty POL converter in this case performs either the regular or the fast turn-
off depending on a specific fault.
Propagation of an error (overvoltage or phase voltage error) initiates fast turn-off of other POL converters. The
faulty POL converter performs the fast turn-off and turns on its low side switch. In addition, when an error is
propagated, the DPM can generate commands to turn off a front end (a DC-DC converter generating the
intermediate bus voltage) and trigger an optional crowbar protection to accelerate removal of the intermediate bus
voltage (IBV).
REV. 4.0 JUL 28, 2006
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