GE Industrial Solutions 6A Austin MicroLynx II - Manual (Page 13)

GE Energy
Data Sheet
6A Austin MicroLynx TM II: Non-Isolated DC-DC Power Modules
8.3Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 6A Output Current
October 16, 2012 ©2012 General Electric Company. All rights reserved. Page 13
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Austin MicroLynx TM 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:
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
MicroLynx
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 30. Circuit configuration to program output voltage
using an external resistor
Table 1 provides Rtrim values for most 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.
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 (P
max
= V
o,set
x I
o,max
).
Voltage Margining
Output voltage margining can be implemented in the Austin
MicroLynx
TM II modules by connecting a resistor, R
margin-up
,
from Trim pin to ground pin for margining-up the output
voltage and by connecting a resistor, R
margin-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 R
margin-up
and R
margin-down
for a specific output voltage and % margin. Please consult
your local GE Energy technical representative for additional
details
Figure 31. Circuit Configuration for margining Output
voltage.
Vo
Austin Lynx or
Lynx II Series
GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down