參數(shù)資料
型號(hào)： IR21593
廠商： International Rectifier
英文描述： DIMMING BALLAST CONTROL IC
中文描述： 調(diào)光鎮(zhèn)流器控制IC
文件頁(yè)數(shù)： 9/25頁(yè)
文件大?。?/td> 259K
代理商： IR21593
IR21592/IR21593
(S)
www.irf.com
9
External Components Selection Procedure
(Note:
Please refer to
"Typical Connection"
diagram, page 1)
Calculate R
CS
PK
IGN
CS
I
R
6
=
R
sets the maximum ignition current
which corresponds to the maximum
ignition voltage across the lamp.
R
CS
I
IGN
V
IGN
Select R
FMIN
Use Graph 5 or Graph 6
The minimum operating frequency must
be lower than f
of f
(whichever is
lower). R
FMIN
also programs I
MIN
and
I
IPH
, so R
FMIN
must be set first.
R
FMIN
f
MIN
BEGIN
Calculate R
PULL-UP
VAC
R
=
QCCUV
ON
TURN
UP
PULL
I
Set R
and R
such that the voltage
on pin VDC will exceed 5.1 volts at the
desired line turn-on voltage.
R
VDC
VAC
TURN-ON
Calculate R
VDC
ON
TURN
VAC
R
ON
TURN
1
VDC
VAC
VAC
R
=
1
1
The voltage at pin IPH is the reference
for amplitude current control during
preheat mode. R
IPH
must be set after
R
FMIN
.
R
IPH
I
PH
V
PH
Select & Calculate R
IPH
Use Graph 8 to find I
IPH
,
then calculate R
IPH
I
R
=
IPH
CS
PH
IPH
I
R
PK
Calculate C
CPH
(
CPH
C
6
=
)
PH
t
e
7
During preheat, an internal 1.3
μ
A
current source at pin CPH charges
external capacitor CCPH. Preheat mode
ends when VCPH exceeds 5.1 volts.
C
CPH
t
PH
Calculate
MIN
(Equations 8 & 9)
Find V
MIN
(Graph 9)
R
sets the lower phase boundary
corresponding to minimum lamp
power when V
DIM
= 0 volts. R
MIN
must
be set after R
FMIN
.
R
MIN
MIN
P
LAMP
Calculate R
MAX
Use Equation 15
R
MAX
MAX
P
LAMP
R
sets the upper phase boundary
corresponding to maximum lamp power
when V
DIM
= 5 volts. R
MAX
must be set
after R
FMIN
and R
MIN
.
Find I
MIN
(Graph 7)
MIN
MIN
MIN
I
V
R
=
Calculate R
MIN
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