PDT006A0X3-SRZ Datasheet, PDF (23/39 Pages) Lineage Power Corporation – 6A Digital Pico DLynxTM: Non-Isolated DC-DC Power Modules 3Vdc ––14.4Vdc input; 0.45Vdc to 5.5Vdc output; 6A Output Current

Preliminary Data Sheet
October 17, 2011
6A Digital Pico DLynx^TM: Non-isolated DC-DC Power Modules
3 –– 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 6A output current
where IOUT_CORR is the temperature corrected value of
the current measurement, IREAD_OUT is the module
current measurement value, TIND is the temperature of
the inductor winding on the module. Since it may be
difficult to measure TIND, it may be approximated by an
estimate of the module temperature.
Measuring Output Voltage Using the PMBus
The module can provide output voltage information
using the READ_VOUT command. The command
returns two bytes of data all representing the mantissa
while the exponent is fixed at -10 (decimal).
During manufacture of the module, offset and gain
correction values are written into the non-volatile
memory of the module. The command
VOUT_CAL_OFFSET can be used to read and/or write
the offset (two bytes consisting of a 16-bit mantissa in
two’’s complement format) while the exponent is always
fixed at -10 (decimal). The allowed range for this offset
correction is -125 to 124mV. The command
VOUT_CAL_GAIN can be used to read and/or write the
gain correction - two bytes consisting of a five-bit
exponent (fixed at -8) and a 11-bit mantissa. The range
of this correction factor is -0.125V to +0.121V, with a
resolution of 0.004V. The corrected output voltage
reading is then given by:
V_OUT (Final) =
[V_OUT (Initial) × (1 + VOUT _ CAL _ GAIN)]
+ VOUT _ CAL _ OFFSET
Measuring Input Voltage Using the PMBus
The module can provide output voltage information
using the READ_VIN command. The command returns
two bytes of data in the linear format. The upper five bits
[7:3] of the high data form the two’’s complement
representation of the mantissa which is fixed at ––5
(decimal). The remaining 11 bits are used for two’’s
complement representation of the mantissa, with the
11^th bit fixed at zero since only positive numbers are
valid.
During module manufacture, offset and gain correction
values are written into the non-volatile memory of the
module. The command VIN_CAL_OFFSET can be used
to read and/or write the offset - two bytes consisting of a
five-bit exponent (fixed at -5) and a11-bit mantissa in
two’’s complement format. The allowed range for this
offset correction is -2 to 1.968V, and the resolution is
32mV. The command VIN_CAL_GAIN can be used to
read and/or write the gain correction - two bytes
consisting of a five-bit exponent (fixed at -8) and a 11-bit
mantissa. The range of this correction factor is -0.125V
to +0.121V, with a resolution of 0.004V. The corrected
output voltage reading is then given by:
V_IN (Final) =
[V_IN (Initial) × (1 + VIN _ CAL _ GAIN)]
+ VIN _ CAL _ OFFSET
Reading the Status of the Module using the
PMBus
The module supports a number of status information
commands implemented in PMBus. However, not all
features are supported in these commands. A 1 in the
bit position indicates the fault that is flagged.
STATUS_BYTE : Returns one byte of information with a
summary of the most critical device faults.
Bit
Position
Flag
Default
Value
7
X
0
6
OFF
0
5
VOUT Overvoltage
0
4
IOUT Overcurrent
0
3
VIN Undervoltage
0
2
Temperature
0
1
CML (Comm. Memory Fault)
0
0
None of the above
0
STATUS_WORD : Returns two bytes of information with
a summary of the module’’s fault/warning conditions.
Low Byte
Bit
Position
Flag
Default
Value
7
X
0
6
OFF
0
5
VOUT Overvoltage
0
4
IOUT Overcurrent
0
3
VIN Undervoltage
0
2
Temperature
0
1
CML (Comm. Memory Fault)
0
0
None of the above
0
Bit
Position
7
6
5
4
3
2
1
0
High Byte
Flag
VOUT fault or warning
IOUT fault or warning
X
X
POWER_GOOD# (is negated)
X
X
X
Default
Value
0
0
0
0
0
0
0
0
STATUS_VOUT : Returns one byte of information
relating to the status of the module’’s output voltage
related faults.
Bit
Position
7
6
Flag
VOUT OV Fault
X
Default
Value
0
0
LINEAGE POWER
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