Data Sheet
Austin LynxTM II SIP Non-isolated Power Modules:
March 12, 2009
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 10A output current
By a using 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 Austin LynxTM II SIP can be
programmed to any voltage from 0.75 Vdc to 3.3 Vdc by
connecting a single resistor (shown as Rtrim in Figure
31) 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).
21070
⎡
⎤
Rtrim =
−5110 Ω
⎢
⎥
Vo − 0.7525
⎣
⎦
Voltage Margining
For example, to program the output voltage of the
Austin LynxTM II module to 1.8 Vdc, Rtrim is calculated is
follows:
Output voltage margining can be implemented in the
Austin LynxTM II SIP modules by connecting a resistor,
R
margin-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 32 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.
21070
⎡
⎤
Rtrim =
− 5110 Ω
⎢
⎣
⎥
1.8 − 0.7525
⎦
Rtrim =15.004kΩ
VIN(+)
VO(+)
Vo
LOAD
ON/OFF
TRIM
Rmargin-down
R
trim
Austin Lynx or
Lynx II Series
GND
Q2
Trim
Figure 31. Circuit configuration to program output
voltage using an external resistor.
Rmargin-up
Table 1 provides Rtrim values required for some
common output voltages.
Rtrim
Table 1
VO, (V)
0.7525
1.2
Rtrim (KΩ)
Open
Q1
GND
41.973
23.077
15.004
6.947
1.5
Figure 32. Circuit Configuration for margining
Output voltage.
1.8
2.5
3.3
3.160
Feature Descriptions (continued)
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