10

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3) IR21592 Programmable Inputs

With all of the lamp requirements fulfilled, the component values for setting the programmable inputs

of the IR21592 are calculated as:

Table V, IR21592 Programmable Inputs for T8/36W lamp.

Important Note: These design kits are intended as a demonstration of the functionality and perfor-

mance of the IR21592 Dimming Ballast Control IC only. Adequate EMI filtering, line transient protec-

tion, galvanic dim control input isolation, and ballast and lamp life testing are not considered in this

design.

Equation No.

Variable

Value

(8)

%

100

f

46kHz

(8)

%

1

f

58kHz

(9)

%

100

ϕ

-56.12deg

(9)

%

1

ϕ

-89.27deg

(10)

FMIN

R

33kOhm

(11)

CS

R

0.8 Ohm

(12)

IPH

R

24kOhm

(13)

TPH

C

330nF

(14)

MIN

R

27kOhm

(15)

MAX

R

24kOhm