IRPLLNR4 International Rectifier, IRPLLNR4 Datasheet - Page 20

• Manufacturer Part Number: IRPLLNR4
• Description: BALLAST UNIV INP FLUOR IR2166
• Manufacturer: International Rectifier

Specifications of IRPLLNR4

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *IRPLLNR4

Design Procedure to adapt the design to different lamp types
To adapt the design to different types of lamps you need to adjust the values of: LPFC, MPFC, MLO,
MHO, CPH, RT, RPH, RCS, CT, REOL4, CRES and LRES. Do not change any others values!
Cross both lamps (i.e. connect a filament or resistor to each lamp cathode position but not a good
lamp) and measure the lamp voltage at ignition using a storage oscilloscope.
In the case of voltage mode heating, increase CH1 and CH2 to increase the preheat voltage (use 6-7
turns in the secondary of LRES).
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1) Use the Ballast Designer Software to set the values of LRES, CRES, LPFC, MPFC, MLO and
1) Set RCS to get the right maximum ignition voltage (decrease RCS to increase the ignition voltage)
Connect both lamps correctly and measure the input power
2) Set RT to set the power on the lamp (increase RT to decrease the frequency and increase
3) Set RPH to set the right preheat frequency (increase RPH to decrease the preheat fre-
4) Select CPH to set the preheat time (increase CPH to increase the preheat time)
5) Verify the value of LPFC at each limit of the line/load range:
maximum input voltage: If the COMP pin becomes less than 400mV the PFC will not operate
in a stable manner and it is necessary to increase LPFC.
minimum input voltage: If the PFC does not operate in a stable manner and audible noise can
be heard from LPFC, it is necessary to decrease LPFC.
6) Set ROL4 to set the End of life protection to a percentage of the lamp voltage. For example, to
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)
MHO, CT, and to set the starting values of CPH, RT, RPH, RCS and LPFC.
Cross both lamps (i.e. connect a filament or resistor to each lamp cathode position but not a
good lamp) and measure the lamp voltage at ignition using a storage oscilloscope.
the power on the lamp)
quency and increase the preheat current)
set the protection threshold to 30% of the lamp voltage:
Data and specifications subject to change without notice.
RD-0602
3/30/2006
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