IR21592 Ver la hoja de datos (PDF) - International Rectifier
Número de pieza
componentes Descripción
Fabricante
IR21592 Datasheet PDF : 26 Pages
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IR21592/IR21593(S) &(PbF)
External Components Selection Procedure
(Note:
BEGIN
Please refer to
"Typical Connection"
diagram, page 1)
Calculate RPULL-UP
RPULL −UP
=
VACTURN −ON
I QCCUV
Set RVAC and RVDC such that the voltage
on pin VDC will exceed 5.1 volts at the
desired line turn-on voltage.
The minimum operating frequency must
be lower than f100% of fIGN (whichever is
lower). RFMIN also programs IMIN and IIPH,
so RFMIN must be set first.
RCS sets the maximum ignition current
which corresponds to the maximum
ignition voltage across the lamp.
Calculate RVDC
R VD
C
=
1−
5.1
VAC TUR
5.N1
VAC TUR
N
−
−
O
N
O
N
R
VA
C
Select RFMIN
Use Graph 1 or Graph 2
Calculate RCS
RCS
=
1.6
I IGNPK
The voltage at pin IPH is the reference
for amplitude current control during
preheat mode. RIPH must be set after
RFMIN.
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.
RMIN sets the lower phase boundary
corresponding to minimum lamp
power when VDIM = 0 volts. RMIN must
be set after RFMIN.
Select & Calculate RIPH
Use Graph 8 to find IIPH,
then calculate RIPH:
I P ⋅RC
R = IP
H PK
S
I H
IP
H
Calculate CCPH
CCPH = (2.6e − 7) tPH
Calculate RMIN
Find IMIN (Graph 3)
Calculate ϕMIN (Equations 8 & 9)
Find VMIN (Graph 9)
RMIN
=
VMIN
I MIN
RMAX sets the upper phase boundary
corresponding to maximum lamp power
when VDIM = 5 volts. RMAX must be set
after RFMIN and RMIN.
Calculate RMAX
Use Equation 15
www.irf.com
RVDC
RFMIN
RCS
RIPH
CCPH
RMIN
RMAX
VACTURN-ON
fMIN
IIGN
VIGN
IPH
VPH
tPH
ϕMIN PLAMP
ϕMAX PLAMP
9
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