Data Sheet
Austin SuperlynxTM II SMT Non-isolated Power Modules:
June 21, 2008
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 16A output current
Feature Descriptions (continued)
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.
Output Voltage Programming
The output voltage of the Austin SuperLynxTM II SMT can
be programmed to any voltage from 0.75 Vdc to 3.63
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:
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 (Pmax = Vo,set x Io,max).
21070
⎡
⎤
Rtrim =
−5110 Ω
⎢
⎥
Vo − 0.7525
⎣
⎦
Voltage Margining
For example, to program the output voltage of the Austin
SuperLynxTM module to 1.8 Vdc, Rtrim is calculated is
follows:
Output voltage margining can be implemented in the
Austin SuperLynxTM II modules by connecting a resistor,
R
margin-up, from the Trim pin to the ground pin for
21070
⎡
⎤
Rtrim =
− 5110
margining-up the output voltage and by connecting a
resistor, Rmargin-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 Rmargin-up and Rmargin-down for a specific output
voltage and % margin. Please consult your local Lineage
Power technical representative for additional details.
⎢
⎣
⎥
⎦
1.8 − 0.7525
Rtrim =15.004kΩ
Vout
VIN(+)
VO(+)
TRIM
ON/OFF
LOAD
Vo
R
trim
Rmargin-down
GND
Austin Lynx or
Lynx II Series
Q2
Figure 30. Circuit configuration for programming
output voltage using an external resistor.
Trim
Rmargin-up
Table 1 provides Rtrim values required for some common
output voltages
Rtrim
Q1
Table 1
VO, set (V)
0.7525
1.2
Rtrim (KΩ)
Open
GND
41.973
23.077
15.004
6.947
Figure 31. Circuit Configuration for margining Output
voltage.
1.5
1.8
2.5
3.3
3.160
LINEAGE POWER
13
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