SGS Thomson Microelectronics TN22 Datasheet
FEATURES
:1200- 1500Vand100 0-1600V versions
V
BR
>175 mA
I
H
<1.5 mA
I
GT
DESCRIPTION
TN22
STARTLIGHT
SOT194
(Plastic)
The TN22 is an high performance asymetrical
SCR in high voltage PNPN diffused planar tech-
K
A
G
nology.
Packageeither in TO220AB,SOT 82or SOT194,
these parts are intended for use in electronic
TO220AB
(Plastic)
SOT82
(Plastic)
ABSOLUTERATINGS (limiting values)
Symbol Parameter Value Unit
V
DRM
I
T(RMS)
Repetitivepeak off-statevoltage Tj= 110°C 400 V
RMS on-state current
Tc=95°C2 A
Fullsine ware (180° conductionangle)
I
T(AV)
Mean on-state current
Tc=95°C 1.8 A
Fullsine ware (180° conductionangle)
I
TSM
Non repetitivesurge peak on-state current
initial= 25°C)
(T
j
tp = 8.3ms 22 A
tp =10ms 20
2
tI
I
dI/dt Criticalrateof riseof on-statecurrent
2
t Valuefor fusing tp =10ms 2 A2s
50 A/µs
I
=5mA dIG/dt = 70 mA/µs.
G
T
stg
T
j
Storageandoperating junction temperaturerange - 40to + 150
Tl Maximumlead temperaturefor soldering during 10sat
4.5mm from case
April 1995
°C
- 40to + 110
260 °C
1/7
TN22
THERMAL RESISTANCES
Symbol Parameter Value Unit
Rth(j-a) Junctionto ambient TO220AB 60 °C/W
SOT 82 / SOT 194 100
Rth(j-c)
Junctionto case
3 °C/W
GATECHARACTERISTICS (maximum values)
P
= 300mW PGM=2W(tp=20µs) I
G(AV)
=1 A (tp= 20 µs) V
FGM
RGM
=6V
ELECTRICALCHARACTERISTICS
Symbol Test Conditions Type Value Unit
I
V
V
I
DRM
GT
GT
I
TM
H
VD=12V (DC) RL=33Ω
VD=12V (DC) RL=33Ω
=1KΩ
R
GK
VGK=0V Tj= 25°C MIN 175 mA
ITM= 2A tp= 380µs Tj= 25°C MAX 3.1 V
V
Rated Tj= 25°C MAX 0.1 mA
DRM
dV/dt Linear slopeup to
=67%V
V
D
DRMVGK
=0V
Tj= 25°C MAX 1.5 mA
Tj= 25°C MAX 3 V
Tj=110°C MIN 500 V/µs
Symbol
Test Conditions
V
BR
ID= 5mA VGK=0V
Tj = 25°C
ORDERINGINFORMATION
T N 2 2 - XXXX X
THYRISTOR
FAMILY
2/7
STARLIGHT Packages
I
T(RMS)
2:2A
MAX
IGTMAX
2 :1.5 mA
Suffix
Unit
TN22-1500 TN22-1600
MIN 1200 1000 V
MAX 1500 1600 V
VBRMAX
1500 : 1500V
1600 : 1600V
T : TO220AB
D :SOT 82
K : SOT 194
TN22
This thyristorhas beendesigned for use as a fluorescenttube starterswitch.
Auelectronicstarter circuitprovides:
BASIC APPLICATION DIAGRAM
INDUCTANCE
BALLAST
220 V
AV
VOLTAGE
FLUORESCENT
TUBE
A pre-heating period during which a heating
current is appliedto the cathodeheaters.
One or severalhigh voltagestriking pulses
across the lamp.
STARTER CIRCUIT
R
TN22
S
CONTROLER
(TIMER)
PRINCIPLEOFOPERATION
1/ Pre-heating
At resttheswitch S isopenedand when the mains
voltage is applied across the circuita full waverectified current flows through the resistor R and the
TN22 gate : At every half-cyclewhen this current
reachesthe gatetriggeringcurrent(I
) the thyris-
GT
tor turnson.
When the device is turned-on the heating current,
limited bythe ballastchoke,flowsthroughthetube
heaters.
The pre-heatingtime is typically2 or3 seconds.
2/ Pulsing
At theend of thepre-heatingphasethe switch S is
turned on.At thismoment:
If thecurrentthroughthe devicesishigherthan the
holding current (I
the currentfalls (below I
) the thyristor remains on until
H
). Thenthe thyristor turns
H
off.
If thecurrent is equalor lower than theholdingcurrent thethyristorturns off the instantaneously.
When the thyristor turns off the current flowing
through the ballas choke generatesa high voltage
pulse. Thisovervoltage is clampedbythe thyristor
avalanchecharacteristic(V
BR
).
If thelampisnotstruckafterthefirst pulse,thesystem startsa newignitionsequenceagain.
3/ Steadystate
When the lamp is on the runningvoltage is about
150V and thestarterswitchis inthe off-state.
IMPLEMENTATION
The resistorR must be chosen toensure a proper
triggering in the worst case (minimum operating
temperature) according to the specified gate triggering currentand thepeakline voltage.
SwitchS : Thisfunctioncan be realizedwithagate
sensitiveSCRtype : P0130AA...
This component is a low voltage device (< 50V)
and the maximum current sink through this switch
can reach the levelof thethyristor holdingcurrent.
The pre-heating period can be determinedby the
time constant of a capacitor-resistor circuit
charged by the voltage drop of diodes usedin series in thethyristorcathode.
3/7
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