Preliminary Data Sheet
January 19, 2012
3A Analog Pico DLynxTM: Non-isolated DC-DC Power Modules
3 – 14.4Vdc input; 0.6Vdc to 5.5Vdc output; 3A output current
Without an external resistor between Trim and GND
pins, the output of the module will be 0.6Vdc. To
calculate the value of the trim resistor, Rtrim for a
desired output voltage, should be as per the following
equation:
Vo
Rmargin-down
MODULE
Q2
12
Vo − 0.6
Trim
Rtrim =
kΩ
(
)
Rmargin-up
Rtrim is the external resistor in kΩ
Vo is the desired output voltage.
Table 1
Rtrim
Q1
GND
VO, set (V)
0.6
Rtrim (KΩ)
Open
40
Figure 43. Circuit Configuration for margining
Output voltage.
0.9
1.0
30
1.2
1.5
1.8
2.5
3.3
5.0
20
13.33
10
6.316
4.444
2.727
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.
Remote Sense
The power module has a Remote Sense feature to
minimize the effects of distribution losses by regulating
the voltage at the SENSE pin. The voltage between
the SENSE pin and VOUT pin should not exceed 0.5V.
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will
shutdown if the overtemperature threshold of
Voltage Margining
TBDoC(typ) is exceeded at the thermal reference point
T
ref . Once the unit goes into thermal shutdown it will
Output voltage margining can be implemented in the
module by connecting a resistor, Rmargin-up, from the
Trim pin to the ground pin for margining-up the output
voltage and by connecting a resistor, Rmargin-down, from
the Trim pin to output pin for margining-down. Figure
43 shows the circuit configuration for output voltage
margining. The POL Programming Tool, available at
www.lineagepower.com under the Downloads section,
also calculates the values of Rmargin-up and Rmargin-down
for a specific output voltage and % margin. Please
consult your local Lineage Power technical
then wait to cool before attempting to restart.
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.
Power Good
The module provides a Power Good (PGOOD) signal
that is implemented with an open-drain output to
indicate that the output voltage is within the regulation
limits of the power module. The PGOOD signal will be
de-asserted to a low state if any condition such as
overtemperature, overcurrent or loss of regulation
occurs that would result in the output voltage going
±10% outside the setpoint value. The PGOOD terminal
can be connected through a pullup resistor (suggested
value 100KΩ) to a source of 5VDC or lower.
representative for additional details.
Dual Layout
Identical dimensions and pin layout of Analog and
Digital Pico DLynx modules permit migration from one
to the other without needing to change the layout. To
support this, 2 separate Trim Resistor locations have
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