Data Sheet
Austin LynxTM II SMT Non-isolated Power Modules:
August 28, 2009
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 10A output current
The amount of power delivered by the module is defined
Feature Descriptions (continued)
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).
Output Voltage Programming (continued)
For example, to program the output voltage of the
Austin LynxTM II module to 1.8 Vdc, Rtrim is calculated is
follows:
21070
⎡
⎤
Rtrim =
− 5110 Ω
⎢
⎣
⎥
Voltage Margining
1.8 − 0.7525
⎦
Output voltage margining can be implemented in the
Austin LynxTM II modules by connecting a resistor,
Rmargin-up, from the Trim pin to the ground pin for
margining-up the output voltage and by connecting a
resistor, Rmargin-down, from the Trim pin to the Output pin
for margining-down. Figure 32 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.
Rtrim =15.004kΩ
VIN(+)
VO(+)
LOAD
ON/OFF
TRIM
R
trim
GND
Vo
Figure 31. Circuit configuration to program output
voltage using an external resistor.
Rmargin-down
Austin Lynx or
Lynx II Series
Table 1 provides Rtrim values required for some
common output voltages.
Q2
Table 1
VO, (V)
0.7525
1.2
Rtrim (KΩ)
Open
Trim
Rmargin-up
41.973
23.077
15.004
6.947
Rtrim
1.5
1.8
Q1
2.5
3.3
3.160
GND
By a 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..
Figure 32. Circuit Configuration for margining
Output voltage.
LINEAGE POWER
13
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
