Data Sheet
Austin MicroLynxTM II 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 6A output current
May 19, 2009
Using 1% tolerance trim resistor, set point tolerance of
Feature Descriptions (continued)
±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 MicroLynxTM II 12V can
be programmed to any voltage from 0.75Vdc to 5.5Vdc
by connecting a resistor (shown as Rtrim in Figure 30)
between Trim and GND pins of the module. Without an
external resistor between Trim and GND pins, the output
of the module will be 0.7525Vdc. To calculate the value
of the trim resistor, Rtrim for a desired output voltage, 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
10500
⎡
⎤
Rtrim =
−1000 Ω
⎢
⎥
Vo − 0.7525
⎣
⎦
at or below the maximum rated power (Pmax = Vo,set
o,max).
x
Rtrim is the external resistor in Ω
Vo is the desired output voltage
I
Voltage Margining
For example, to program the output voltage of the Austin
MicroLynxTM 12V module to 1.8V, Rtrim is calculated as
follows:
Output voltage margining can be implemented in the
Austin MicroLynxTM II 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 31 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
10500
⎡
⎤
Rtrim =
−1000
⎢
⎣
⎥
⎦
1.8 − 0.7525
Rtrim = 9.024kΩ
VIN(+)
VO(+)
Vo
ON/OFF
LOAD
TRIM
Rmargin-down
R
trim
Austin Lynx or
Lynx II Series
GND
Q2
Figure 30. Circuit configuration to program output
voltage using an external resistor
Trim
Rmargin-up
Rtrim
Table 1 provides Rtrim values for most common
output voltages.
Table 1
Q1
VO, set (V)
0.7525
1.2
Rtrim (KΩ)
Open
GND
22.46
Figure 31. Circuit Configuration for margining
Output voltage.
1.5
13.05
1.8
9.024
2.5
5.009
3.3
3.122
5.0
1.472
LINEAGE POWER
13
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