PDT006A0X3-SRZ Datasheet, PDF (16/39 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
Output Voltage Sequencing
The power module includes a sequencing feature, EZ-
SEQUENCE that enables users to implement various
types of output voltage sequencing in their applications.
This is accomplished via an additional sequencing pin.
When not using the sequencing feature, leave it
unconnected.
The voltage applied to the SEQ pin should be scaled
down by the same ratio as used to scale the output
voltage down to the reference voltage of the module.
This is accomplished by an external resistive divider
connected across the sequencing voltage before it is fed
to the SEQ pin as shown in Fig. 44. In addition, a small
capacitor (suggested value 100pF) should be connected
across the lower resistor R1.
For all DLynx modules, the minimum recommended
delay between the ON/OFF signal and the sequencing
signal is 10ms to ensure that the module output is
ramped up according to the sequencing signal. This
ensures that the module soft-start routine is completed
before the sequencing signal is allowed to ramp up.
DLynx Module
V
SEQ
20K
SEQ
R1=Rtrim
100 pF
SIG_GND
Figure 44. Circuit showing connection of the
sequencing signal to the SEQ pin.
When the scaled down sequencing voltage is applied to
the SEQ pin, the output voltage tracks this voltage until
the output reaches the set-point voltage. The final value
of the sequencing voltage must be set higher than the
set-point voltage of the module. The output voltage
follows the sequencing voltage on a one-to-one basis.
By connecting multiple modules together, multiple
modules can track their output voltages to the voltage
applied on the SEQ pin.
To initiate simultaneous shutdown of the modules, the
SEQ pin voltage is lowered in a controlled manner. The
output voltage of the modules tracks the voltages below
their set-point voltages on a one-to-one basis. A valid
input voltage must be maintained until the tracking and
output voltages reach ground potential.
Note that in all digital DLynx series of modules, the
PMBus Output Undervoltage Fault will be tripped when
sequencing is employed. This will be detected using the
STATUS_WORD and STATUS_VOUT PMBus
commands. In addition, the SMBALERT# signal will be
asserted low as occurs for all faults and warnings. To
avoid the module shutting down due to the Output
Undervoltage Fault, the module must be set to continue
operation without interruption as the response to this
fault (see the description of the PMBus command
VOUT_UV_FAULT_RESPONSE for additional
information).
Overcurrent Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current limiting
continuously. At the point of current-limit inception, the
unit enters hiccup mode. The unit operates normally
once the output current is brought back into its specified
range.
Digital Adjustable Overcurrent Warning
Please see the Digital Feature Descriptions section.
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will
shut down if the overtemperature threshold of
150^oC(typ) is exceeded at the thermal reference point
Tref .Once the unit goes into thermal shutdown it will then
wait to cool before attempting to restart.
Digital Temperature Status via PMBus
Please see the Digital Feature Descriptions section.
Digitally Adjustable Output Over and Under
Voltage Protection
Please see the Digital Feature Descriptions section.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, the module operation is disabled. The module will
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
Digitally Adjustable Input Undervoltage
Lockout
Please see the Digital Feature Descriptions section.
Digitally Adjustable Power Good Thresholds
Please see the Digital Feature Descriptions section.
LINEAGE POWER
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