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IR2156 Datasheet(PDF) 20 Page - International Rectifier

Part # IR2156
Description  BALLAST CONTROL IC
PDF  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR2156 Datasheet(HTML) 20 Page - International Rectifier

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IR2156(S)&(PbF)
20
www.irf.com
ignite. The maximum ignition current is given as:
CS
IGN
R
I
25
.
1
=
[Amps Peak] (9)
or
IGN
CS
I
R
25
.
1
=
[Ohms] (10)
Design Example: 42W-QUAD BIAX CFL
Note: The results from the following design
example can differ slightly from experimental
results 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 is chosen to be 0.8
µs. Using
Equation (2) gives the following result:
pF
pF
e
t
C
DT
T
470
400
2000
6
8
.
0
2000
⇒
=
−
=
=
Step 2: Program Run Frequency
The run frequency is chosen to be 43kHz. Using
Equation (4) gives the following result:
3333
12
.
1
1
−
⋅
⋅
=
RUN
T
T
f
C
R
3333
43000
470
12
.
1
1
−
⋅
⋅
=
pF
R
T
Ω
⇒
Ω
=
k
R
T
43
846
,
40
Step 3: Program Preheat Frequency
The preheat frequency is chosen such that the
lamp filaments are adequately heated within the
preheat time. A preheat frequency of 70kHz was
chosen. Using Equation (6) gives the following
result:


−
⋅
⋅
−
⋅


−
⋅
⋅
=
3333
12
.
1
1
3333
12
.
1
1
PH
T
T
T
PH
T
PH
f
C
R
R
f
C
R


−
⋅
⋅
−
⋅


−
⋅
⋅
=
3333
70000
470
02
.
1
1
43000
43000
3333
70000
470
12
.
1
1
pF
pF
R
PH
Ω
⇒
Ω
=
k
R
PH
51
330
,
53
Step 4: Program Preheat Time
The preheat time of 500ms seconds was chosen.
Using Equation (8) gives the following result:
Step 5: Program Ignition Current
The maximum ignition current is given by the
maximum ignition voltage and is chosen as
2.0Apk. Using Equation (10) gives the following
result:
6
331
.
0
−
⋅
=
e
t
C
PH
PH
)
6
331
.
0
(
)
3
500
(
−
⋅
−
=
e
e
C
PH
uF
uF
C
PH
22
.
0
166
.
0
>
−
=



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