Data Sheet
Austin SuperlynxTM II SIP Non-isolated Power Modules:
March 31, 2008
2.4 – 5.5Vdc input; 0.75Vdc to 3.3Vdc 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 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:
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
⎣
⎦
For example, to program the output voltage of the Austin
SuperLynxTM module to 1.8 Vdc, Rtrim is calculated is
follows:
Voltage Margining
Output voltage margining can be implemented in the
Austin SuperLynxTM II modules by connecting a resistor,
21070
⎡
⎤
Rtrim =
− 5110
Rmargin-up, from the Trim pin to the ground pin for
⎢
⎣
⎥
⎦
1.8 − 0.7525
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
Rtrim =15.004kΩ
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.
Vout
VIN(+)
VO(+)
TRIM
ON/OFF
LOAD
R
Vo
trim
GND
Rmargin-down
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
Table 1
Q1
VO, set (V)
0.7525
1.2
Rtrim (KΩ)
Open
GND
41.973
23.077
15.004
6.947
1.5
1.8
Figure 31. Circuit Configuration for margining Output
voltage.
2.5
3.3
3.160
LINEAGE POWER
13
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
