2
October 27, 2010
AN1582.0
7. Jumpers JP1, JP2, and JP3 are inserted, whereas JP4
is open, which provides a logic high signal to the
SELVTOP pin for controlling the output voltage.
Consult the
,
additional information.
8. Click on Open Device and the ‘USB Attach’ and ‘USB
Device Handle’ buttons in the top left should turn
green.
9. To enable the ISL6423, ISL6423B, toggle the EN bit
on System Register 4 to ‘1’, at which point the
evaluation board should read approximately 13.3V
between VLNB and GND post.
10.For additional programming features on the
ISL6423, ISL6423B evaluation board, please
consult the
,
I
2
C register settings.
11.For accurate noise and tone measurement, please
insert the scope probe in the SP1 connector on the
evaluation board. Figure 4 shows the ISL6423,
ISL6423B tone at 500mA of resistive load current
from 12V
IN
when the output voltage is programmed
for 13.3V.
FIGURE 3.
Application Note 1582
