GE Industrial Solutions 2 × 12A Digital Dual Output MicroDLynx - Manual (Page 19)

GE
Datasheet
2 × 12A Digital Dual MicroDlynx TM : Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 2 × 12A Output Current
February 14, 2014 ©2014 General Electric Corporation. All rights reserved. Page 19
Operation (01h)
This is a paged register. The OPERATION command can be
use to turn the module on or off in conjunction with the
ON/OFF pin input. It is also used to margin up or margin
down the output voltage
PMBus Enabled On/Off
The module can also be turned on and off via the PMBus
interface. The OPERATION command is used to actually turn
the module on and off via the PMBus, while the
ON_OFF_CONFIG command configures the combination of
analog ON/OFF pin input and PMBus commands needed to
turn the module on and off. Bit [7] in the OPERATION
command data byte enables the module, with the following
functions:
0 : Output is disabled
1 : Output is enabled
This module uses the lower five bits of the ON_OFF_CONFIG
data byte to set various ON/OFF options as follows:
Bit Position 4 3 2 1 0
Access r/w r/w r/w r r
Function PU CMD CPR POL CPA
Default Value 1 0 1 1 0
PU: Sets the default to either operate any time input power
is present or for the ON/OFF to be controlled by the analog
ON/OFF input and the PMBus OPERATION command. This bit
is used together with the CP, CMD and ON bits to determine
startup.
Bit Value Action
0
Module powers up any time power is
present regardless of state of the analog
ON/OFF pin
1
Module does not power up until
commanded by the analog ON/OFF pin and
the OPERATION command as programmed
in bits [2:0] of the ON_OFF_CONFIG register.
CMD: The CMD bit controls how the device responds to the
OPERATION command.
Bit Value Action
0
Module ignores the ON bit in the
OPERATION command
1
Module responds to the ON bit in the
OPERATION command
CPR: Sets the response of the analog ON/OFF pin. This bit is
used together with the CMD, PU and ON bits to determine
startup.
Bit Value Action
0
Module ignores the analog ON/OFF pin, i.e.
ON/OFF is only controlled through the
PMBUS via the OPERATION command
1
Module requires the analog ON/OFF pin to
be asserted to start the unit
CPA: Sets the action of the analog ON/OFF pin when turning
the controller OFF. This bit is internally read and cannot be
modified by the user
PMBus Adjustable Soft Start Rise Time
The soft start rise time can be adjusted in the module via
PMBus. When setting this parameter, make sure that the
charging current for output capacitors can be delivered by
the module in addition to any load current to avoid nuisance
tripping of the overcurrent protection circuitry during
startup. The TON_RISE command sets the rise time in ms,
and allows choosing soft start times between 600μs and
9ms, with possible values listed in Table 5. Note that the
exponent is fixed at -4 (decimal) and the upper two bits of
the mantissa are also fixed at 0.