參數(shù)資料
型號(hào)： IR2167
廠商： International Rectifier
英文描述： PFC BALLAST CONTROL IC
中文描述： PFC的鎮(zhèn)流器控制IC
文件頁(yè)數(shù)： 27/30頁(yè)
文件大小： 937K
代理商： IR2167
IR2167(
S
)
www.irf.com
27
Step 2: Program Maximum Ignition Current
The ignition current should be limited to the rating of the
lamp resonant inductor and the half-bridge MOSFETS. The
saturation current of the lamp resonant inductor should be
much lower than the current rating of the MOSFETS. Under
worst case conditions, the lamp resonant inductor should
not be allowed to saturate. This current is controlled by the
CS pin and the OC pin. The OC lead has an internal 50
μ
A
current source. This current through external resistor ROC
determines the threshold on the CS pin.
If the current through external resistor RCS exceeds a
predetermined value, the IC shuts off.
Step 3: Program Preheat Frequency
The preheat frequency is determined by the parallel
combination of RPH and RT along with CT and RDT. The
frequency should be chosen so that the voltage across the
lamp is much lower than the ignition voltage but still provides
adequate heating of the filaments. During preheat, the current
through the filaments is constant. However, as the filaments
heat up, their resistance increases. This results in an
increase in the voltage measured across the filaments, which
indicates the hot to cold ratio.
4:1 is an acceptable ratio for proper heating
OC
CS
CS
E
OC
R
E
V
or
V
R
=
+
+
=
6
55
6
55
+
+
=
td
C
R
R
R
R
f
T
PH
T
PH
T
PH
2
1
=
td
f
C
R
td
f
C
R
ph
T
T
ph
T
PH
2
1
1
1
2
1
1
Step 4: Program preheat time
The preheat time is determined by external capacitor CPH.
The preheat time required for a 4:1 hot to cold ratio can be
observed by measuring the voltage across the filaments.
The preheat time is calculated as follows:
The IR2167 is held in preheat until CPH is charged to 4.0V.
Step 5: Program the ignition mode time
The difference in time between the preheat mode and the
run mode is the ignition mode. The rate at which the fre-
quency changes from preheat to run is determined by exter-
nal resistor RRAMP.
Step 6. Program the run frequency
The run mode begins when external resistor RPH is charged
to 5.1V. At this time, the run frequency is determined by the
parallel combination of RT and RRUN along with RDT and
CT. The run frequency can be programmed above or below
the ignition frequency. fRUN is determined by the following
equation:
PH
PH
C
E
t
=
6
0
+
+
=
td
C
R
R
R
R
f
T
RUN
T
RUN
T
RUN
2
1
=
td
f
C
R
td
f
C
R
RUN
T
T
RUN
T
RUN
2
1
1
1
2
1
1
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