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参数资料
型号： PDT012A0X3-SRZ
厂商： LINEAGE POWER LLC
元件分类： 电源模块
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
封装： ROHS COMPLIANT PACKAGE-17
文件页数： 14/39页
文件大小： 856K
代理商： PDT012A0X3-SRZ
Preliminary Data Sheet
May 4, 2011
12A Digital Pico DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 12A output current
LINEAGE POWER
21
using the “Linear” mode with the exponent fixed at –10
(decimal). The value of the offset voltage is given by
10
)
(
2
_
×
=
TRIM
VOUT
V
offset
OUT
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.
10
)
(
2
)
_
(
×
+
=
TRIM
VOUT
HIGH
MARGIN
VOUT
V
MH
OUT
10
)
(
2
)
_
(
×
+
=
TRIM
VOUT
LOW
MARGIN
VOUT
V
ML
OUT
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 :
Margin Off
0101 :
Margin Low (Ignore Fault)
0110 :
Margin Low (Act on Fault)
1001 :
Margin High (Ignore Fault)
1010 :
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:
10
)
_
(
10
)
_
(
2
)
_
(
2
)
_
(
×
=
×
=
LIMIT
FAULT
UV
VOUT
V
LIMIT
FAULT
OV
VOUT
V
REQ
UV
OUT
REQ
OV
OUT
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
12A 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).
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