GE Industrial Solutions Austin SuperLynx II 12V SIP - Manual (Page 13)

Data Sheet
October 1, 2009 Austin SuperLynx TM II 12V SIP Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output;16A output current
LINEAGE POWER 13
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Austin SuperLynx TM II 12V
can be programmed to any voltage from 0.75Vdc to
5.5Vdc by connecting a resistor (shown as Rtrim in
Figure 29) between the Trim and GND pins of the
module. Without an external resistor between the
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 SuperLynx
TM II module to 1.8V, Rtrim is
calculated as follows:
⎥⎦
⎤
⎢⎣
⎡
−
−
= 1000
75 . 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 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
By 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 SuperLynx
TM II 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.