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參數(shù)資料
| 型號(hào)： | TN22-B |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | STARTLIGHT |
| 中文描述： | STARTLIGHT |
| 文件頁(yè)數(shù)： | 3/9頁(yè) |
| 文件大?。?/td> | 163K |
| 代理商： | TN22-B |
TN22
3/9
This thyristor has been designed for use as a fluo-
rescent tube starter switch.
An electronic starter circuit provides :
■
A pre-heating period during which a heating cur-
rent is applied to the cathode heaters.
■
One or several high voltage striking pulses
across the lamp.
Figure 1: Basic application diagram
1/ Pre-heating
At rest the switch S is opened and when the mains
voltage is applied across the circuit a full wave rec-
tified current flows through the resistor R and the
TN22 gate : at every half-cycle when this current
reaches the gate triggering current (I
GT
) the thyris
tor turns on.
When the device is turned on the heating current,
limited by the ballast choke, flows through the tube
heaters.
The pre-heating time is typically 2 or 3 seconds.
2/ Pulsing
At the end of the pre-heating phase the switch S is
turned on. At this moment :
If the current through the devices is higher than the
holding current (I
H
) the thyristor remains on until
the current falls below I
H
. Then the thyristor turns
off.
If the current is equal or lower than the holding cur-
rent the thyristor turns off instantaneously.
When the thyristor turns off the current flowing
through the ballast choke generates a high voltage
pulse. This overvoltage is clamped by the thyristor
avalanche characteristic (V
BR
).
If the lamp is not struck after the first pulse, the
system starts a new ignition sequence again.
3/ Steady state
When the lamp is on the running voltage is about
150V and the starter switch is in the off-state.
IMPLEMENTATION
The resistor R must be chosen to ensure a proper
triggering in the worst case (minimum operating
temperature) according to the specified gate trig-
gering current and the peak line voltage.
Switch S : This function can be realized with a gate
sensitive SCR type : P0130AA 1EA3
This component is a low voltage device (< 50V)
and the maximum current sunk through this switch
can reach the level of the thyristor holding current.
The pre-heating period can be determined by the
time constant of a capacitor-resistor circuit
charged by the voltage drop of diodes used in se-
ries in the thyristor cathode.
TN22
R
S
STARTER CIRCUIT
CONTROLLER
(TIMER)
INDUCTANCE
BALLAST
FLUORESCENT
TUBE
AC
VOLTAGE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TN22-H | STARTLIGHT |
| TN22-T | STARTLIGHT |
| TN2222A | NPN SILICON PLANAR SWITCHING TRANSISTOR |
| TN2540-600G | SCR |
| TN2540-800G | SCR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TN22-B.29 | 制造商:TEKO 功能描述:Bulk 制造商:TEKO 功能描述:ENCLOSURE TEKNET BLACK/GREY |
| TN22-B.29-AL | 制造商:OKW ENCLOSURES INC 功能描述:ENCLOSURE, ABS, BLACK/GRAY, 6.102 X 3.78 X 1.11 W/BATTERY |
| TN22-B.30 | 制造商:TEKO 功能描述: |
| TN22-H | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:STARTLIGHT |
| TN22-T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:STARTLIGHT |
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