Data Sheet
Austin MegaLynxTM: Non-Isolated DC-DC Power Modules:
4.5 – 5.5Vdc input; 0.8 – 3.63Vdc output; 30A output current
6.0 – 14Vdc input; 0.8 – 5.5Vdc output; 25A output current
June 3, 2009
Input Under Voltage Lockout
Table 1
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.
VO, set (V)
0.8
Rtrim (Ω)
Open
5900
2900
1614
1100
606
1.0
1.2
1.5
1.8
2.5
3.3
5.0
Output Voltage Programming
The output voltage of the Austin MegaLynx can be
programmed to any voltage from 0.8dc to 5.0Vdc by
connecting a resistor (shown as Rtrim in Figure 45)
between Trim and GND pins of the module. Without an
external resistor between Trim and GND pins, the output
of the module will be 0.8Vdc. To calculate the value of
the trim resistor, Rtrim for a desired output voltage, use
the following equation:
380
186
Voltage Margining
Output voltage margining can be implemented in the
Austin MegaLynx modules by connecting a resistor,
margin-up, from the Trim pin to the ground pin for
1200
⎡
⎤
R
Rtrim =
−100 Ω
⎢
⎥
Vo − 0.80
margining-up the output voltage and by connecting a
resistor, Rmargin-down, from the Trim pin to output pin for
margining-down. Figure 46 shows the circuit
configuration for output voltage margining. The POL
Programming Tool, available at www.lineagepower.com
under the Design Tools 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 representative for additional
details.
⎣
⎦
Rtrim is the external resistor in Ω
Vo is the desired output voltage
By using a ±0.5% tolerance trim resistor with a TC of
±100ppm, a set point tolerance of ±1.5% can be
achieved as specified in the electrical specification.
Table 1 provides Rtrim values required for some
common output voltages. The POL Programming Tool,
available at www.lineagepower.com under the Design
Tools section, helps determine the required external trim
resistor needed for a specific output voltage.
Voltage Sequencing
The Austin MegaLynx series of modules include a
sequencing feature 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,
either leave the SEQ pin unconnected or tied to VIN.
VIN(+)
VO(+)
Vo
LOAD
ON/OFF
TRIM
Rmargin-down
Rtrim
Austin Lynx or
Lynx II Series
GND
Q2
Figure 45. Circuit configuration to program output
voltage using an external resistor.
Trim
Rmargin-up
Rtrim
Q1
GND
Figure 46. Circuit Configuration for margining
Output voltage.
LINEAGE POWER
14
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
