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AN1971 Datasheet(PDF) 7 Page - STMicroelectronics

Part # AN1971
Description  ST7LITE0xxx MICROCONTROLLED BALLAST
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1971 Datasheet(HTML) 7 Page - STMicroelectronics

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ST7LITE0xxx MICROCONTROLLED BALLAST
2.2 PREHEAT STATE
Software has full control during the whole procedure in the preheat state. This means that you
select the desired preheating current and then a control algorithm regulates the current. The
algorithm used is the simplest one: the step-regulation. The software raises the frequency by
one step (125ns) every time the measured current is bigger than the desired value, and vice
versa.
In addition, it is possible, by changing only one constant, to set the preheating time from zero
(cold start) up to a few seconds.
2.3 IGNITION STATE
The purpose of this state is obvious, the software decrease the frequency (increases the
voltage) to ignite the lamp.
As an extra feature, you can adjust the ignition speed (the time between each frequency step)
in the software. To detect the moment when the lamp ignites, a simple assumption is used that
the voltage across the lamp will significantly decrease after ignition. After detecting the ignition
the software moves to the next phase.
2.4 LAMP STABILIZATION STATE
After the ignition of the lamp, a constant frequency is set. You should preselect this frequency
in the software as an expected frequency value for the lamp used. This state serves for stabi-
lization of all the lamp characteristics as well as the sensor circuits.
2.5 RUN STATE
At this final phase, the software measures the current to get a given power in the lamp. The
calculation of the active power flowing through the lamp is very simple, because the DC cur-
rent flowing through the sense resistor is the current from the supply. The supply is presumed
to be a constant 400V and so the power is linearly proportional to the DC current. Then the
measured value is compared with a preset value and consequently the software tries to cor-
rect it. Again, the same step regulation control algorithm as in the preheat phase is used.
There is no need to have high speed of this control. Since the gas inside the tube has a long
response time, it needs a few milliseconds to stabilize after each change; the speed can be
relatively slow (less than a few hertz).


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