FGSD12SR6003A Datasheet, PDF (15/41 Pages) List of Unclassifed Manufacturers – 3-14.4Vdc Input, 3A, 0.45-5.5Vdc Output

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FGSD12SR6003*A
3-14.4Vdc Input, 3A, 0.45-5.5Vdc Output
The default value of the mantissa is 00100000000
corresponding to 256 (decimal), corresponding to a
divider ratio of 0.5. The maximum value of the
mantissa is 512 corresponding to a divider ratio of 1.
Note that the resolution of the VOUT_SCALE_LOOP
command is 0.2%.
When PMBus commands are used to trim or margin
the output voltage, the value of V_REF is what is
changed inside the module, which in turn changes
the regulated output voltage of the module.
The nominal output voltage of the module can be
adjusted with a minimum step size of 0.4% over a
±25% range from nominal using the VOUT_TRIM
command over the PMBus.
The VOUT_TRIM command is used to apply a fixed
offset voltage to the output voltage command value
using the “Linear” mode with the exponent fixed at
–10 (decimal). The value of the offset voltage is given
by
V_OUT(offset)  VOUT _TRIM  2^10
This offset voltage is added to the voltage set through
the divider ratio and nominal VREF to produce the
trimmed output voltage. The valid range in two’s
complement for this command is –4000h to 3999h.
The high order two bits of the high byte must both be
either 0 or 1. If a value outside of the +/-25%
adjustment range is given with this command, the
module will set it’s output voltage to the nominal
value (as if VOUT_TRIM had been set to 0), assert
SMBALRT#, set the CML bit in STATUS_BYTE and
the invalid data bit in STATUS_CML.
Output Voltage Margining Using the PMBus
The module can also have its output voltage
margined via PMBus commands. The command
VOUT_MARGIN_HIGH sets the margin high voltage,
while the command VOUT_MARGIN_LOW sets the
margin low voltage. Both the VOUT_MARGIN_HIGH
and VOUT_MARGIN_LOW commands use the
“Linear” mode with the exponent fixed at –10
(decimal). Two bytes are used for the mantissa with
the upper bit [7] of the high byte fixed at 0. The actual
margined output voltage is a combination of the
VOUT_MARGIN_HIGH or VOUT_MARGIN_LOW
and the VOUT_TRIM values as shown below.
V_OUT(MH) 
(VOUT_ MARGIN_ HIGHVOUT_TRIM)  2^10
V_OUT(ML) 
(VOUT_ MARGIN_ LOW VOUT_TRIM)  2^10
Note that the sum of the margin and trim voltages
Preliminary Data Sheet
cannot be outside the ±25% window around the
nominal output voltage. The data associated with
VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW
can be stored to non-volatile memory using the
STORE_DEFAULT_ALL command.
The module is commanded to go to the margined
high or low voltages using the OPERATION
command. Bits [5:2] are used to enable margining as
follows:
00XX :
0101 :
0110 :
1001 :
1010 :
Margin Off
Margin Low (Ignore Fault)
Margin Low (Act on Fault)
Margin High (Ignore Fault)
Margin High (Act on Fault)
PMBus Adjustable Overcurrent Warning
The module can provide an overcurrent warning via
the PMBus. The threshold for the overcurrent
warning can be set using the parameter
IOUT_OC_WARN_LIMIT. This command uses the
“Linear” data format with a two byte data word where
the upper five bits [7:3] of the high byte represent the
exponent and the remaining three bits of the high
byte [2:0] and the eight bits in the low byte represent
the mantissa. The exponent is fixed at –1 (decimal).
The upper five bits of the mantissa are fixed at 0
while the lower six bits are programmable. For
production codes after April 2013, the value for
IOUT_OC_WARN_LIMIT will be fixed at 5.0A. For
earlier production codes the actual value for
IOUT_OC_WARN_LIMIT will vary from module to
module due to calibration during production testing.
The resolution of this warning limit is 500mA. The
value of the IOUT_OC_WARN_LIMIT can be stored
to
non-volatile
memory
using
the
STORE_DEFAULT_ALL command.
Temperature Status via PMBus
The module can provide information related to
temperature of the module through the
STATUS_TEMPERATURE command. The command
returns information about whether the pre-set over
temperature fault threshold and/or the warning
threshold have been exceeded.
PMBus Adjustable Output Over and Under
Voltage Protection
The module has output over and under voltage
protection capability. The PMBus command
VOUT_OV_FAULT_LIMIT is used to set the output
over voltage threshold from four possible values:
108%, 110%, 112% or 115% of the commanded
output
voltage.
The
command
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Ver 1.6 May. 8, 2013