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參數(shù)資料
| 型號： | IRP2166 |
| 廠商： | International Rectifier |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | PFC & BALLAST CONTROL IC |
| 中文描述： | 功率因數(shù)校正 |
| 文件頁數(shù)： | 28/32頁 |
| 文件大小： | 616K |
| 代理商： | IRP2166 |
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IR2166 & (PbF)
28
www.irf.com
Step 3: Program Preheat Frequency
The preheat frequency is programmed with
timing resistors RT and RPH, and timing
capacitor CT. The timing resistors are
connected in parallel internally for the duration
of the preheat time. The preheat frequency is
therefore given as:
+
+
=
1475
51
R
.
2
1
PH
T
PH
T
T
PH
R
R
R
C
f
[Hertz](5)
or
=
2892
02
.
1
2892
02
.
1
PH
T
T
T
PH
T
PH
f
C
R
R
f
C
R
[Ohms] (6)
Step 4: Program Preheat Time
The preheat time is defined by the time it takes
for the capacitor on pin CPH to charge up to
10 volts. An internal current source of 3uA flows
out of pin CPH. The preheat time is therefore
given as:
6
33
.
e
C
t
PH
PH
=
[Seconds] (7)
or
6
3
=
e
t
C
PH
PH
[Farads] (8)
Ballast Design Equations
Note: The results from the following design
equations can differ slightly from experimental
measurements due to IC tolerances, component
tolerances, and oscillator over- and undershoot
due to internal comparator response time.
Step 1: Program Dead-time
The dead-time between the gate driver outputs
HO and LO is programmed with timing capacitor
CT and an internal dead-time resistor RDT. The
dead-time is the discharge time of capacitor CT
from 3/5VCC to 1/3VCC and is given as:
1475
=
T
DT
C
t
[Seconds]
(1)
or
1475
DT
T
t
C
=
[Farads]
(2)
Step 2: Program Run Frequency
The final run frequency is programmed with
timing resistor RT and timing capacitor CT. The
charge time of capacitor CT from 1/3VCC to
3/5VCC determines the on-time of HO and LO
gate driver outputs. The run frequency is
therefore given as:
)
1475
51
.
2
1
+
=
T
T
RUN
R
C
f
[Hertz] (3)
or
2892
02
.
1
=
RUN
T
T
f
C
R
[Ohms] (4)
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