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AN1971 Datasheet(PDF) 9 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) 9 Page - STMicroelectronics

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ST7LITE0xxx MICROCONTROLLED BALLAST
3 ABNORMAL CONDITION HANDLING
3.1 LAMP REMOVAL
This is the most usual error condition during the ballast life. It is relatively common that a lamp
is changed without turning off the mains switch. So the detection of a lamp removal and con-
sequent insertion must be implemented. In Figure 11 a detection circuit is shown. When a
lamp is present in the application the voltage on the processor input pin is zero (logical 0),
while if the lamp is removed the voltage on the input pin rise up to 5V (logical 1). A simple bit-
check is enough to detect the lamp presence and then switch the micro to Stop mode when-
ever it detects the lamp removal.
Figure 11. Detection Circuit for Lamp Removal/Insertion
3.2 LAMP FAILS TO START
This condition can occur only during the ignition state, when the voltage rises without any sign
of lamp ignition. That can be caused for example by filament damage or an old lamp. There
are three security protections implemented. None of them, however, adds a single component
into the application because all of them use the existing possibilities and opportunities given
by ST7LITE0xxx. During the ignition phase, the software checks whether the current or the
voltage exceeds the preset value. If so, it will immediately stop the driver and switch into the
stop state. In addition to these, two protections rather than one were implemented to prevent
the sense circuit failure. This protection allows only a limited number of frequency steps in the
ignition state. In the event that both current and voltage sensors fail and this protection is not
implemented, the frequency will decrease along the resonant curve and the ballast could be
damaged.
R26
10k
C11
10nF
Digital In
+5V
R25
1M
Lamp Filament


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