AXH003A0X Datasheet, PDF (13/18 Pages) Lineage Power Corporation – 2.4 - 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current

Data Sheet
February 26, 2009
Austin MiniLynx^TM SIP Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Austin MiniLynx^TM SIP can be
programmed to any voltage from 0.75 Vdc to 3.63 Vdc
by connecting a single resistor (shown as Rtrim in
Figure 32) 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:
Rtrim
=
⎡ 21070
⎢⎣_{Vo − 0.7525}
−
5110_{⎥⎦⎤}Ω
For example, to program the output voltage of the
Austin MiniLynx^TM module to 1.8 Vdc, Rtrim is calculated
is follows:
Rtrim
=
⎡ 21070
⎢⎣_{1.8 − 0.7525}
−
5110_{⎥⎦⎤}
Rtrim = 15.004kΩ
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.
Voltage Margining
Output voltage margining can be implemented in the
Austin MiniLynx^TM 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 33 shows the circuit
configuration for output voltage margining. The POL
Programming Tool, available at ww.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.
Vo
V_IN(+)
V_O(+)
ON/OFF TRIM
GND
R _trim
LOAD
Rmargin-down
Austin Lynx or
Lynx II Series
Q2
Trim
Rmargin-up
Rtrim
Figure 32. Circuit configuration to program output
voltage using an external resistor.
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
VO, set (V)
0.7525
1.2
1.5
1.8
2.5
3.3
Rtrim (KΩ)
Open
41.973
23.077
15.004
6.947
3.160
Q1
GND
Figure 33. Circuit Configuration for margining
Output voltage.
LINEAGE POWER
13