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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： | 4/16頁 |
| 文件大小： | 102K |
| 代理商： | UBA2000T |
1996 Jan 03
4
Philips Semiconductors
Product specification
Electronic TL-lamp starter
UBA2000T
PINNING
SYMBOL
PIN
DESCRIPTION
V
sense
GND
V
out
V
in
n.c.
V
CC
n.c.
TEST
1
2
3
4
5
6
7
8
sense voltage
ground (0 V)
output voltage
input voltage
not connected
supply voltage
not connected
test pin
Fig.2 Pin configuration.
handbook, halfpage
1
2
3
4
8
7
6
5
MGE001
UBA2000T
TEST
n.c.
GND
VCC
n.c.
Vin
Vout
Vsense
FUNCTIONAL DESCRIPTION
The UBA2000T is an Integrated Circuit that performs all
functions necessary to ignite a TL-lamp. The circuit is
connected to the lamp circuit according to Figs. 7 or 8.
The mains voltage is rectified and divided over resistors
R1 and R2 to a lower level. When the mains power is
switched on, the buffer capacitor C1 is charged through
the resistive divider and internal switch S1. As long as the
supply voltage at the buffer capacitor (V
CC
, see
“Characteristics”) is below the reset level (V
CC(rst)
),
the UBA2000T initializes its internal circuitry.
When V
CC
has reached the start level (V
CC(sl)
) and the
peak value of V
in
> V
ign
(indicating that the mains supply is
near its peak value), the external switching device TH1 will
be turned on. This results in a current through the
electrodes of the TL-lamp, the switching device and an
integrated sense resistor. Because the current starts to
flow when the mains voltage is near its peak value,
transient currents are limited.
When the switching device is turned on, the circuit draws
its supply current from buffer capacitor C1. A typical wave
shape of the voltage at pin 6 (V
CC
) is given in Fig.3. During
the preheat periods the buffer capacitor is discharged.
The rectified current through the sense resistor is detected
and the output signal of the detector is used as a clock
signal for the counter. The preheat time is defined to 1.52 s
(at 50 Hz mains supply) using this counter. The preheat
time is very accurate, since it only depends on the
frequency of the mains supply.
After preheating, the switching device is turned off when
the current through the internal sense resistor equals at
least 285 mA. As a result of the current interruption and the
presence of an inductive load, a voltage peak is generated
that will normally ignite the TL-lamp. After ignition, the
lamp voltage is lower than the mains voltage. An ignited
TL-lamp prevents the voltage at pin 6 (V
CC
) to exceed start
level. In Fig.3 the TL-lamp is ignited after two ignition
attempts.
Fig.3 Typical wave shape of supply voltage.
handbook, full pagewidth
MGE006
VCC(sl)
VCC
tprf
tini
tprn
first preheat
second
preheat
time
first
ignition
second
ignition
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