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13

IRPLMB1E

3.3) If VCC drops, increase the value of

CSNUBBER or CVCC

4)

Adjust the value of RFMIN to have the right

power on the lamp (increase RFMIN to in-

crease power or decrease RFMIN to de-

crease power) and the value of CVCO to set

the correct preheat time (increase CVCO to

increase the preheat time and decrease

CVCO to decrease the preheat time).

5)

Test the ballast over the entire input range

and make sure that the frequency does not

change dramatically in your working range.

Select the value of RSUPPLY to have startup

at the correct AC line voltage. Increase the

value of RSUPPLY to start the IC at higher

AC voltages and decrease the value of

RSUPPLY to start the IC at lower AC volt-

ages.

6)

Test your lamp life (number of starts). A good

design should guarantee at least 5,000

starts. To increase the number of starts, in-

crease CRES or the preheat time (CVCO)

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http://www.irf.com/ Data and specifications subject to change without notice.

3/14/2004