IR2159S datasheet(9/25 Pages) IRF

9 / 25 page

IR21592/IR21593(S)

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External Components Selection Procedure

(Note:

Please refer to

"Typical Connection"

diagram, page 1)

Calculate R

IGN

CS sets the maximum ignition current

which corresponds to the maximum

ignition voltage across the lamp.

IGN

Select R

FMIN

Use Graph 5 or Graph 6

The minimum operating frequency must

be lower than f

100% of fIGN (whichever is

lower). R

FMIN also programs IMIN and

IPH, so RFMIN must be set first.

FMIN

MIN

BEGIN

Calculate R

PULL-UP

QCCUV

TURN

PULL

VAC

−

Set R

VAC and RVDC such that the voltage

on pin VDC will exceed 5.1 volts at the

desired line turn-on voltage.

VDC

VAC

TURN-ON

Calculate R

VDC

TURN

VAC

TURN

VDC

VAC

−













The voltage at pin IPH is the reference

for amplitude current control during

preheat mode. R

IPH must be set after

FMIN.

IPH

Select & Calculate R

IPH

Use Graph 8 to find I

IPH,

then calculate R

IPH:

IPH

⋅

Calculate C

CPH

()

CPH

−

During preheat, an internal 1.3

µA

current source at pin CPH charges

external capacitor CCPH. Preheat mode

ends when VCPH exceeds 5.1 volts.

CPH

Calculate

MIN (Equations 8 & 9)

MIN sets the lower phase boundary

corresponding to minimum lamp

power when V

DIM = 0 volts. RMIN must

be set after R

FMIN.

MIN

LAMP

Calculate R

MAX

Use Equation 15

MAX

LAMP

MAX sets the upper phase boundary

corresponding to maximum lamp power

when V

DIM = 5 volts. RMAX must be set

after R

FMIN and RMIN.

Find V

MIN (Graph 9)

Find I

MIN (Graph 7)

MIN

Calculate R

MIN

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