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UBA2000T 데이터시트 PDF




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부품번호 UBA2000T 기능
기능 Electronic TL-lamp starter
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UBA2000T 데이터시트, 핀배열, 회로
INTEGRATED CIRCUITS
DATA SHEET
UBA2000T
Electronic TL-lamp starter
Product specification
File under Integrated Circuits, IC11
1996 Jan 03




UBA2000T pdf, 반도체, 판매, 대치품
Philips Semiconductors
Electronic TL-lamp starter
Product specification
UBA2000T
PINNING
SYMBOL PIN
DESCRIPTION
Vsense
GND
1 sense voltage
2 ground (0 V)
Vout 3 output voltage
Vin 4 input voltage
n.c. 5 not connected
VCC 6 supply voltage
n.c. 7 not connected
TEST
8 test pin
handbook, halfpage
Vsense 1
8 TEST
GND 2
7 n.c.
UBA2000T
Vout 3
6 VCC
Vin 4
5 n.c.
MGE001
Fig.2 Pin configuration.
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 (VCC, see
“Characteristics”) is below the reset level (VCC(rst)),
the UBA2000T initializes its internal circuitry.
When VCC has reached the start level (VCC(sl)) and the
peak value of Vin > Vign (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 (VCC) 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 (VCC) to exceed start
level. In Fig.3 the TL-lamp is ignited after two ignition
attempts.
handbook, full pagewidth
VCC(sl)
VCC
tini
1996 Jan 03
first preheat
first
ignition
tprf
second
ignition
second
preheat
tprn
Fig.3 Typical wave shape of supply voltage.
4
MGE006
time

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UBA2000T 전자부품, 판매, 대치품
Philips Semiconductors
Electronic TL-lamp starter
Product specification
UBA2000T
Counter
With the counter, which is supplied with pulses with twice
the frequency of the mains supply, the preheat time for the
first preheat and (if necessary) the next six preheats is
defined.
Time select
Depending on the state of the counter a long (tprf = 1.52 s)
or a short (tprn = 0.64 s) preheat time is selected.
Number of starts counter
The number of starts are counted by a counter. After seven
ignition attempts the IC is brought into standby state.
In standby state the supply current (ICC) is increased.
Due to the increased current, the buffer capacitor C1 will
discharge faster when the starter is disconnected from the
mains. This makes it possible to automatically reset the
starter the moment a malfunctioning tube is replaced by a
new one.
Current protection
When the current through the sense resistor exceeds its
limit (Iprot), the switching device will be turned off. During
the first few periods of conduction, the current protection is
disabled (disable time td) to ensure that transient currents
do not trigger the current protection. When the current has
exceeded its limit, the switching device is turned off and
the IC enters the standby state that prevents re-activating
the switching device. Only an interruption of the supply
voltage will reset the standby state.
Output driver
The output driver is capable of driving a low input current
trigger device as well as a device controlled by a gate.
During start-up the output is kept low to prevent turning on
the external switching device.
This has a minimal effect on the voltage division ratio,
since the voltage at the gate of the trigger device is low.
The output driver generates the current pulse, which is
necessary to activate the external switching device TH1.
This current pulse is synchronized with the voltage at pin 4
(Vin). The switching device is triggered when Vin reaches
the Vign level. In that way the current through resistors R1
and R2 is a part of the current needed to activate the
switching device. If necessary, the current pulse is
delivered every half cycle of the mains voltage. When the
switching device must be turned off, the output driver is
capable of sinking the gate turn-off current of the switching
device.
It might be necessary to limit the current peaks, which flow
through the switching device at turn-on, resulting from
discharging the suppressor capacitor (C2). This can be
achieved using a resistor (R3).
GATE INPUT DEVICE
A typical application that uses a MOSFET is given in Fig.8.
In this circuit the resistive divider is connected to ground.
The output driver of the IC operates the same way as when
a trigger device is used. The output current pulse will
charge the gate of the MOSFET. As a result, the MOSFET
will be activated.
To keep the MOSFET conductive, a high ohmic pull-up
resistor is connected between the gate of the MOSFET
and the buffer capacitor C1. This is necessary, because
the output current is a pulse and not a continuous signal.
This pull-up resistor increases the current which is drawn
from the buffer capacitor. An internal zener diode in the IC
limits the voltage at the output (and thus at the gate of the
MOSFET) to a typical value of 6.8 V.
Both switching devices require the breakdown voltage
(V(BR)AK or V(BR)DS) to be larger than the ignition voltage of
the TL-lamp.
TRIGGER DEVICE
A typical application that uses a low input current trigger
device (such as TN22) as switching device is given in
Fig.7. The resistive divider R1//R2 is not connected to
ground but to the gate of the trigger device.
1996 Jan 03
7

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UBA2000T

Electronic TL-lamp starter

NXP Semiconductors
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