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參數資料
| 型號： | UBA2000T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Electronic TL-lamp starter(電子TL-lamp啟動器) |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 文件頁數： | 5/16頁 |
| 文件大小： | 102K |
| 代理商： | UBA2000T |
1996 Jan 03
5
Philips Semiconductors
Product specification
Electronic TL-lamp starter
UBA2000T
During preheating, the integrated circuit draws its supply
current from the buffer capacitor. As a result, the voltage
over the buffer capacitor decreases. When the ignition has
failed after the ignition pulse, the voltage on the buffer
capacitor increases to start level and the external
switching device will be turned on again. This time the
preheat time is reduced to 0.64 seconds because the lamp
electrodes are still warm. An internal counter limits the
number of ignitions attempts to 7. This prevents the lamp
from flickering at end of lamp life.
The UBA2000T has an integrated current protection.
When the current through the sense resistor exceeds the
protection level (I
prot
), the switching device is turned off
and the circuit will enter a standby state. Switching the
mains voltage off and on again will reset the circuit.
The flow chart of the starting process is given in Fig.5.
In the following subsections the several blocks of the block
diagram are described in more detail.
IC supply
When the mains power is switched on, the buffer capacitor
is charged and the internal current source is started.
The internal voltage is stabilized, making it independent of
the voltage at the buffer capacitor. An internal zener diode
limits the voltage at pin 6 (V
CC
) to start level (V
CC(sl)
).
Voltage detectors
The voltage detectors measure the voltage on the buffer
capacitor and activate the switching device when the start
value (V
CC(sl)
) is reached. The time required to charge the
capacitor is the initial time (t
ini
, see also Fig.3).
This time depends on the value of C1, the IC current and
the source resistance at pin V
in
(R1//R2). When the mains
voltage is near its peak value, the switching device is
actually turned on. When the voltage decreases to a value
indicating that the mains supply is interrupted, the starter
is ready to start preheating and igniting the TL-lamp at the
moment the mains supply returns.
Latch
The internal state of the latch represents the state of the
switching device. The setting of the latch depends on the
outputs of the voltage detectors, the number of starts
counter and the standby state. Resetting the latch is
controlled by the timer, the current detector and the current
protection circuit.
Current detector
The current detector detects when the switching device
must be turned off. The current detector also generates the
clock pulses to activate the counter (see Fig.4). For proper
functioning, the preheat current should be within the range
indicated by I
pr
. By including an hysteresis, unwanted
current peaks on the preheat current have no effect on the
counter. Because the current detector has a low-pass
transfer function, it is not influenced by spikes. This
circuitry eliminates the effect of spikes on the preheat time.
Edge detector
The edge detector ensures that the switching device will
be turned off when the rectified preheat current is on the
negative-going edge.
Fig.4 Current detection.
handbook, full pagewidth
MGE007
hysteresis
Iso level
current through
sense resistor
clock signal
(fed to counter)
switch off level at end of preheat
clock generation during preheat
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