GE Industrial Solutions ATM020A0X3-SR - Manual (Page 13)

Data Sheet
September 10, 2013 Austin SuperLynx II TM SMT Non-isolated Power Modules:
2.4 – 3.63Vdc input; 0.75Vdc to 2.0Vdc Output; 20A output current
LINEAGE POWER 13
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Austin SuperLynx II TM SMT can
be programmed to any voltage from 0.75 Vdc to 2.0 Vdc
by connecting a single resistor (shown as Rtrim in Figure
22) 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 22. 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
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 , determines the set point
variation with specific trim resistor values and tolerances.
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
II 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 23 shows the circuit
configuration for output voltage margining. The POL
Programming tool available at
www.lineagepower.com
computes 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
MODULE
GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down
Figure 23. Circuit Configuration for margining Output
voltage.