PDT006A0X3-SRZ Datasheet, PDF (21/39 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
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
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 six bits of the mantissa are fixed
at 0 while the lower five bits are programmable with a
default value of TBD (decimal). 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 VOUT_UV_FAULT_LIMIT sets
the threshold that causes an output under voltage fault
and can also be selected from four possible values:
92%, 90%, 88% or 85%. The default values are 112%
and 88% of commanded output voltage. Both
commands use two data bytes formatted as two’’s
complement binary integers. The ““Linear”” mode is used
with the exponent fixed to ––10 (decimal) and the
effective over or under voltage trip points given by:
V_{OUT (OV _ REQ)} = (VOUT _ OV _ FAULT _ LIMIT ) × 2^−10
V_{OUT (UV _ REQ)} = (VOUT _ UV _ FAULT _ LIMIT ) × 2^−10
Values within the supported range for over and
undervoltage detection thresholds will be set to the
nearest fixed percentage. Note that the correct value for
VOUT_SCALE_LOOP must be set in the module for the
correct over or under voltage trip points to be calculated.
In addition to adjustable output voltage protection, the
6A Digital Pico DLynx^TM module can also be
programmed for the response to the fault. The
VOUT_OV_FAULT RESPONSE and
VOUT_UV_FAULT_RESPONSE commands specify the
response to the fault. Both these commands use a
single data byte with the possible options as shown
below.
1. Continue operation without interruption (Bits
[7:6] = 00, Bits [5:3] = xxx)
2. Continue for four switching cycles and then
shut down if the fault is still present, followed by
no restart or continuous restart (Bits [7:6] = 01,
Bits [5:3] = 000 means no restart, Bits [5:3] =
111 means continuous restart)
3. Immediate shut down followed by no restart or
continuous restart (Bits [7:6] = 10, Bits [5:3] =
000 means no restart, Bits [5:3] = 111 means
continuous restart).
4. Module output is disabled when the fault is
present and the output is enabled when the
LINEAGE POWER
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