Data Sheet
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
March 31, 2008
Feature Descriptions (continued)
Using 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.
Output Voltage Programming
The output voltage of the Austin MiniLynxTM 12V can
be programmed to any voltage from 0.75Vdc to
5.5Vdc by connecting a resistor (shown as Rtrim in
Figure 29) 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:
Voltage Margining
Output voltage margining can be implemented in the
Austin MiniLynxTM 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 30 shows the circuit
configuration for output voltage margining. The POL
Programming Tool, available at
10500
⎡
⎤
Rtrim =
−1000 Ω
⎢
⎥
Vo − 0.7525
⎣
⎦
Rtrim is the external resistor in Ω
Vo is the desired output voltage
www.lineagepower.com under the Design Tools
section, also calculates the values of Rmargin-up and
R
margin-down for a specific output voltage and % margin.
For example, to program the output voltage of the
Austin MiniLynxTM 12V module to 1.8V, Rtrim is
calculated as follows:
Please consult your local Lineage Power technical
representative for additional details.
10500
⎡
⎤
Rtrim =
−1000
Vo
⎢
⎣
⎥
⎦
1.8 − 0.7525
Rmargin-down
Rtrim = 9.024kΩ
Austin Lynx or
Lynx II Series
VIN(+)
VO(+)
Q2
Trim
Rmargin-up
LOAD
ON/OFF
TRIM
Rtrim
R
trim
GND
Q1
GND
Figure 29. Circuit configuration to program
output voltage using an external resistor.
Figure 30. Circuit Configuration for margining
Output voltage.
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
V
O, set (V)
Rtrim (KΩ)
Open
0.7525
1.2
22.46
1.5
13.05
1.8
9.024
2.5
5.009
3.3
3.122
5.0
1.472
LINEAGE POWER
13
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
