ATH006A0X4 datasheet(13/19 Pages) LINEAGEPOWER

13 / 19 page

Data Sheet

June 24, 2008

Austin MicroLynxTM II SIP Non-isolated Power Modules:

2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 6A output current

LINEAGE POWER

Feature Descriptions (continued)

Output Voltage Programming

The output voltage of the Austin MicroLynx

TM 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:

⎥⎦

⎤

⎢⎣

⎡

−

5110

7525

21070

Rtrim

For example, to program the output voltage of the Austin

MicroLynx

TM II module to 1.8 Vdc, Rtrim is calculated is

follows:

⎥⎦

⎤

⎢⎣

⎡

−

5110

7525

21070

Rtrim

004

VO(+)

TRIM

GND

Rtrim

LOAD

VIN(+)

ON/OFF

Vout

Figure 30. 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)

Rtrim (KΩ)

0.7525

Open

1.2

41.973

1.5

23.077

1.8

15.004

2.5

6.947

3.3

3.160

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 MicroLynx

TM 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 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.

Austin Lynx or

Lynx II Series

GND

Trim

Rtrim

Rmargin-up

Rmargin-down

Figure 31. Circuit Configuration for margining

Output voltage.

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