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參數(shù)資料
| 型號： | IRPLLNR1 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 130K |
| 代理商： | IRPLLNR1 |
Reference Design Data Sheet intended for design information only.
Subjected to changes without prior notice.
4
IRPLLNR1
Ballast Control
The ballast control section consists of R18, R19, R20, C12, C13, C15, D10, M3 and the
IR2153 ballast controller IC (IC3), and is responsible for driving the half-bridge output at
different operating conditions: preheat, ignition and running. During preheat, the half-bridge
is driven at a fixed frequency for a fixed duration of time so the lamp cathodes can be heated
to their correct emission temperature. This maximizes the life of the filament coating and
therefore the life of the lamp. Furthermore, lower ignition voltages and currents are needed to
ignite the lamp, which reduce the maximum voltage and current ratings of the lamp resonant
circuit (L4, L5, C21, C23), as well as the half-bridge power MOSFETs (M4, M5). After
preheat, the frequency is then swept lower through the resonance frequency to the final
running frequency where the lamp is driven to the manufacturer’s recommended lamp power
rating for the desired lamp type. As the frequency passes through resonance, the lamp
ignites when the required ignition voltage is reached across the lamp. To achieve the various
operating conditions, the corresponding frequencies are programmed with the RT and CT pins
of the IR2153. C13 and C15 are first connected in series to define the preheat frequency
where,
f
C
20
C
13
R
C
C
ph
=
+
13
15
)(
. (
15
)(
)
[3]
When the voltage on C12 reaches the zener voltage of D10, M3 turns on and C15 is shorted.
This gives a new operating frequency, the running frequency, defined as,
f
R
C
run
=
1
. (
20
13
)(
)
[4]
The slow sweeping of the frequency from preheat to running (ignition ramp) occurs due to a
combination of the limited transconductance of M3 and the slow rising voltage on the gate.
The running frequency of the lamp resonant circuit for given component values is given as,
f
LC
P
CV
LC
P
CV
n
L C
run
Lamp
2
Lamp
Lamp
2
Lamp
=
+
1
2
1
2
1
2
1
2
2
2
2
2
[5]
where,
L
=
=
Lamp resonant circuit inductor
Lamp resonant circuit capacitor
=
Manufacturers recommended lamp power
=
Manufacturers recommended lamp voltage [Vrms]
2
2
V
Lamp
[H]
[F]
[W]
C
P
Lamp
V
Lamp
n
=
V
DCbus
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