Data Sheet
12V Austin LynxTM SIP Non-isolated Power Modules, Programmable:
10Vdc – 14Vdc input; 0.75Vdc to 5.5Vdc Output;10A Output Current
March 30, 2008
By using a 1% tolerance trim resistor, set point
Feature Descriptions (continued)
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.
Output Voltage Programming
The output voltage of the 12V Austin Lynx
Programmable SIP module can be programmed to any
voltage from 0.75 Vdc to 5.5 Vdc by connecting a single
resistor (shown as Rtrim in Figure 28) between the
TRIM and GND pins of the module. Without an external
resistor between the TRIM pin and the ground, the
output voltage of the module is 0.7525 Vdc. To
calculate the value of the resistor Rtrim for a particular
output voltage Vo, use the following equation:
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).
10500
⎡
⎤
Rtrim =
−1000 Ω
⎢
⎥
Voltage Margining
Vo − 0.7525
⎣
⎦
Output voltage margining can be implemented in the
12V Austin Lynx Programmable SIP modules 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
the Output pin for margining-down. Figure 29 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.
For example, to program the output voltage of the 12V
Austin Lynx Programmable SIP module to 1.8 Vdc,
Rtrim is calculated is follows:
10500
⎡
⎤
Rtrim =
−1000
⎢
⎣
⎥
⎦
1.8 − 0.7525
Rtrim = 9.024kΩ
VIN(+)
VO(+)
LOAD
ON/OFF
TRIM
Vo
Rmargin-down
R
trim
GND
Austin Lynx or
Lynx II Series
Q2
Figure 28. Circuit configuration for programming
output voltage using an external resistor.
Trim
Rmargin-up
Table 1 provides Rtrim values for some common output
voltages, while Table 2 provides values of the external
voltage source, Vtrim for the same common output
voltages.
Rtrim
Q1
Table 1
GND
VO, set (V)
0.7525
1.2
Rtrim (KΩ)
Open
Figure 29. Circuit Configuration for margining
Output voltage.
22.46
1.5
13.05
1.8
9.024
Remote Sense
2.5
5.009
The 12V Austin Lynx Programmable SIP power
3.3
3.122
modules have a Remote Sense feature to minimize the
effects of distribution losses by regulating the voltage at
the Remote Sense pin (See Figure 30). The voltage
5.0
1.472
LINEAGE POWER
13
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