Data Sheet
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14 Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
April 8, 2008
Voltage Margining
Feature Descriptions (continued)
Output voltage margining can be implemented in the
12V Austin Lynx Programmable SMT modules by
connecting a resistor, Rmargin-up, from Trim pin to ground
pin for margining-up the output voltage and by
connecting a resistor, Rmargin-down, from Trim pin to
Output pin. Figure 30 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
By using a 1% tolerance trim resistor, set point tolerance
of ±2% is achieved as specified in the electrical
specification. 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.
The amount of power delivered by the module is defined
as the voltage at the output terminals multiplied by the
output current. When using the trim feature, the output
voltage of the module can be increased, which at the
same output current would increase the power output of
the module. Care should be taken to ensure that the
maximum output power of the module remains at or
below the maximum rated power (Pmax = Vo,set x Io,max).
Rmargin-up and Rmargin-down for a specific output voltage
and % margin. Please consult your local Lineage
Power technical representative for additional details
Vo
Rmargin-down
Austin Lynx or
Lynx II Series
Remote Sense
Q2
The 12V Austin Lynx Programmable SMT power modules
have a Remote Sense feature to minimize the effects of
distribution losses by regulating the voltage at the
Remote Sense and GND pins (See Figure 29). The
voltage between the Sense pin and Vo pin must not
exceed 0.5V. Although both the Remote Sense and the
TRIM features can increase the output voltage Vo, the
maximum increase is not the sum of both. The maximum
Vo increase is the larger of either the Remote Sense or
TRIM.
Trim
Rmargin-up
Rtrim
Q1
GND
The amount of power delivered by the module is defined
as the output voltage multiplied by the output current (Vo
x Io). When using Remote Sense and/or TRIM, the
output voltage of the module can increase, which if the
same output is maintained, increases the power output by
the module. Make sure that the maximum output power
of the module remains at or below the maximum rated
power. When the Remote Sense feature is not being
used, leave the Remote Sense pin unconnected.
Figure 30. Circuit Configuration for margining
Output voltage.
Rdistribution Rcontact
Rcontact Rdistribution
VIN(+)
VO
Sense
RLOAD
Rdistribution Rcontact
Rcontact Rdistribution
COM
COM
Figure 29. Remote sense circuit configuration
LINEAGE POWER
13
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
