GE Industrial Solutions Austin Superlynx II SIP - Manual (Page 13)

Data Sheet
October 2, 2009 Austin Superlynx TM II SIP Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.3Vdc Output; 16A output current
LINEAGE POWER 13
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Austin SuperLynx TM II SIP can
be programmed to any voltage from 0.75 Vdc to 3.3 Vdc
by connecting a single resistor (shown as Rtrim in Figure
30) between the TRIM and GND pins of the module.
Without an external resistor between TRIM pin and the
ground, the output voltage of the module is 0.7525 Vdc.
To calculate the value of the resistor Rtrim for a particular
output voltage Vo, use the following equation:
Ω
⎥⎦
⎤
⎢⎣
⎡
−
−
= 5110
7525 . 0
21070
Vo
Rtrim
For example, to program the output voltage of the Austin
SuperLynx
TM module to 1.8 Vdc, Rtrim is calculated is
follows:
⎥⎦
⎤
⎢⎣
⎡
−
−
= 5110
7525 . 0 8 . 1
21070
Rtrim
Ω = k Rtrim 004 . 15
V
O
(+)
TRIM
GND
R
trim
LOAD
V
IN
(+)
ON/OFF
Vout
Figure 30. Circuit configuration for programming
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 41.973
1.5 23.077
1.8 15.004
2.5 6.947
3.3 3.160
By using a 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 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 Lineage
Power technical representative for additional details.
Vo
Austin Lynx or
Lynx II Series
GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down
Figure 31. Circuit Configuration for margining Output
voltage.