IRPLLNR3 查看數據表（PDF） - International Rectifier

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IRPLLNR3

Universal Input Linear Fluorescent Ballast using the IR2167

International Rectifier 

RPLLNR3

7) Set ROL4 to set the End of life protection to a percentage of the lamp voltage. For example,

to set the protection threshold to 20% of the lamp voltage:

With the first method: {(Vpklamp) x 20/100} x REOL4 / (REOL4 + REOL1 + REOL2 + REOL3)

should give approximately 7V.

With the second method: The value of REOL4 is chosen to have the SD pin varying between 2-0.7V

and 2+0.7 during normal operations and exceeding the window comparator limits (less than 1V

or more than 3V) with 30% change in the voltage of the lamp.

(Fine tuning of this threshold can be done by trying different REOL4 values on the test bench)

www.irf.com

IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105

Data and specifications subject to change without notice. 3/29/2002

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