GE Industrial Solutions Austin Minilynx 12V SMT - Manual (Page 13)

Data Sheet
September 10, 2013 Austin MiniLynx TM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
LINEAGE POWER 13
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Austin MiniLynx
TM 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:
Ω




−
−
= 1000
7525 . 0
10500
Vo
Rtrim
Rtrim is the external resistor in Ω
Vo is the desired output voltage
For example, to program the output voltage of the
Austin MiniLynx
TM 12V module to 1.8V, Rtrim is
calculated as follows:




−
−
= 1000
7525 . 0 8 . 1
10500
Rtrim
Ω = k Rtrim 024 . 9
V
O
(+)
TRIM
GND
R
trim
LOAD
V
IN
(+)
ON/OFF
Figure 29. Circuit configuration to program
output voltage using an external resistor.
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
V
O, set
(V) Rtrim (KΩ)
0.7525 Open
1.2 22.46
1.5 13.05
1.8 9.024
2.5 5.009
3.3 3.122
5.0 1.472
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.
Voltage Margining
Output voltage margining can be implemented in the
Austin MiniLynx
TM 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, R
margin-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
www.lineagepower.com under the Design Tools
section, also calculates the values of R
margin-up
and
R
margin-down
for a specific output voltage and % margin.
Please consult your local Lineage Power technical
representative for additional details.
Vo
Austin Lynx or
Lynx II Series
GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down
Figure 30. Circuit Configuration for margining
Output voltage.