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參數(shù)資料
| 型號： | IR2156SPbF |
| 廠商： | International Rectifier |
| 英文描述： | BALLAST CONTROL IC |
| 中文描述： | 鎮(zhèn)流器控制IC |
| 文件頁數(shù)： | 19/24頁 |
| 文件大小： | 497K |
| 代理商： | IR2156SPBF |
IR2156
(S) & (PbF)
www.irf.com
19
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 under-shoot
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:
2000
=
T
DT
C
t
[Seconds]
(1)
or
2000
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:
)
2000
6
2
1
+
=
T
T
RUN
R
C
f
[Hertz] (3)
or
3333
12
.
1
=
RUN
T
T
f
C
R
[Ohms] (4)
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:
+
+
=
2000
6
2
1
PH
T
PH
T
T
PH
R
R
R
R
C
f
[Hertz] (5)
or
=
3333
12
.
1
3333
12
.
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 13
volts (assuming Vcc = 15 volts). An internal
current source of 4.3
μ
A flows out of pin CPH. The
preheat time is therefore given as:
[Seconds] (7)
or
[Farads] (8)
6
Step 5: Program Maximum Ignition Current
The maximum ignition current is programmed with
the external resistor RCS and an internal threshold
of 1.25 volts. This threshold determines the over-
current limit of the ballast, which can be exceeded
when the frequency ramps down towards
resonance during ignition and the lamp does not
6
02
.
e
C
t
PH
PH
=
331
.
=
e
t
C
PH
PH
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