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IR2156STRPBF Datasheet(PDF) 19 Page - International Rectifier

Part # IR2156STRPBF
Description  BALLAST CONTROL IC
Download  21 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR2156STRPBF Datasheet(HTML) 19 Page - International Rectifier

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IR2156(S)PbF
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.
For additional design support for different lamp types and AC line
input
configurations,
including
component
calculations,
schematics, bill of materials and inductor specifications, please
download IR’s Ballast Design Assistant (BDA) software at
www.irf.com.
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
.
0
(
2
1
+
=
T
T
RUN
R
C
f
[Hertz]
(3)
Or,
3333
12
.
1
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
51
.
0
2
1
PH
T
PH
T
T
PH
R
R
R
R
C
f
[Hertz]
(5)
Or,




=
3333
12
.
1
1
3333
12
.
1
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. An internal current source of
5uA flows out of pin CPH. The preheat time is therefore given as:
6
02
.
3
e
C
t
PH
PH
=
[Seconds]
(7)
Or,
6
33
.
0
=
e
t
C
PH
PH
[Farads]
(8)
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 (VCSTH+).
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 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)


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