ST TN22 User Manual

Features

■ High clamping voltage structure

(1200 to 1500 V)

■ Low gate triggering current for direct drive from

line (< 1.5 mA)

■ High holding current (> 175 mA), ensuring high

striking energy

Description

The TN22 has been specifically developed for use
in tube lamp electronic starter circuits.

TN22

Fluorescent tube lamp starter SCR

1

3

TAB

IPAK

TN22-1500H

3

2

1

TAB

TO-220AB

TN22-1500T

2, TAB

1

3

2

Used in conjunction with a sensitive SCR, it
provides high energy striking characteristics with
low triggering power.

Thanks to the optimized characteristics of the
TN22, starters based on this device can offer high
reliability levels and extended life time of the
fluorescent tube lamps.

TAB

2

3

1

DPAK

TN22-1500B-TR

August 2009 Doc ID 3768 Rev 3 1/13

www.st.com

13

Characteristics TN22

1 Characteristics

Table 1. Absolute ratings (limiting values)

Symbol Parameter Value Unit

V

I

T(RMS)

I

T(AV)

I

dl/dt

P

G(AV)

P

I

V

T

Table 2. Electrical characteristics (Tj = 25 °C unless otherwise stated)

Repetitive peak off-state voltage Tj = 110 °C 400 V

RRM

On-state rms current
full sine wave (180° conduction angle)

Mean on-state current
Full sinewave (180° conduction angle)

Non repetitive surge peak on-state current

TSM

(Tj initial = 25 °C)

2

tI2t Value for fusing tp = 10 ms 2 A2s

I

Critical rate of rise of on-state current

= 5 mA dIG/dt = 70 mA/µs

I

G

= 95 °C 2 A

T

c

T

= 95 °C 1.8 A

c

t

= 8.3 ms 22

p

t

= 10 ms 20

p

50 A/µs

Average gate power dissipation 300 mW

= 20 µs

Peak gate power dissipation

GM

Peak gate current

GM

Maximum peak reverse gate voltage 6 V

RGM

stg

Storage and operating junction temperature range

T

j

Maximum lead temperature for soldering during 10 s at 4.5 mm

T

L

from case

t

p

= 20 µs

t

p

2W

1A

-40 to +150

-40 to +110

260 °C

Symbol Test conditions Value Unit

I

V

dV/dt Linear slope up to V

V

Table 3. Static electrical characteristics (Tj = 25 °C unless otherwise stated)

VD=12 V (DC), RL= 33 Ω MAX 1.5 mA

GT

VD=12 V (DC), RL= 33 Ω, RGK = 1 KΩ MAX 3 V

GT

VGK = 0 V MIN 175 mA

I

H

BRID

= 5 mA, VGK = 0 V

= 67% V

D

DRM, VGK

= 0 V, Tj = 110 °C MIN 500 V/µs

MIN 1200

MAX 1500

Symbol Test conditions Value Unit

V

TMITM

I

DRMVDRM

Table 4. Thermal resistance

= 2 A tp = 380 µs MAX 3.1 V

rated MAX 0.1 mA

Symbol Parameter Value Unit

A

°C

V

R

R

th(j-a)

Junction to ambient

Junction to case 3 °C/W

th(j-c)

2/13 Doc ID 3768 Rev 3

DPAK / IPAK 100

TO-220AB 60

°C/W

TN22 Characteristics

Figure 1. Maximum average power

dissipation versus average on-state
current (rectified sine wave)

P(W)

6

5

4

3

2

1

0

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

α=30 °

I

T(AV)

α=60 °

(A)

α=90 °

α=120 °

α=180 °

360°360°360°360°

Figure 3. Average on-state current versus

ambient temperature, free air
convection (rectified full sine wave)

I

(A)

T(AV)

0.7

TO-220AB

0.6

0.5

0.4

0.3

DPAK / IPAK

0.2

0.1

0.0

0 102030405060 708090100110

T

(°C)

amb

α=180°

Figure 5. Relative variation of gate trigger

current and holding current versus
junction temperature

IGT,IH[Tj]/IGT,IH[Tj=25°C]

2.4

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

I

GT

I

H

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130

typical values

Tj(°C)

Figure 2. Average on-state current versus

case temperature
(rectified full sine wave)

I

(A)

T(AV)

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0

360°360°360°360°

0 102030405060 708090100110

α=180 °

TC(°C)

Figure 4. Variation of thermal impedance

junction to ambient versus pulse
duration

Z

(°C/W)

th(j-a)

100.0

10.0

1.0

0.1

1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03

tP(s)

DPAK

IPAK

TO-220AB

Figure 6. Surge peak on-state current versus

number of cycles

I

(A)

TSM

22

20

18

16

14

12

10

8

6

4

Tjinitial=25 °C

2

0

1 10 100 1000

Number of cycles

tp=10ms

One cycle

Doc ID 3768 Rev 3 3/13

Characteristics TN22

0

0

0

0

Figure 7. Non-repetitive surge peak on-state

current for a sinusoidal pulse

I

(A), I²t (A²s)

TSM

1000

dI/dt limitation

50 A/µs

100

t < 10 ms and corresponding value of I t

p

10

1

0.01 0.10 1.00 10.00

2

tP(ms)

Tjinitial=25 °C

I

TSM

I²t

Figure 9. Maximum allowable rms current

versus time conduction and initial
case temperature

I

(A)

T(RMS)

10

Tj max= 135 °C (the failure mode will be short circuit)

9

8

7

6

TCinitial=25°C

5

4

3

2

1

0

TCinitial=65°C

.1 1.

TCinitial=45°CTCinitial=45°C

tP(s)

10.

DPAK

IPAK

100.

Figure 8. On-state characteristics

(maximum values)

ITM(A)

100.0

10.0

1.0

0.1

012345678

Tj=110 °C

Tj=25 °C

VTM(V)

Tjmax. :

Vto= 2.5 V

= 235 mΩ

R

D

Figure 10. Maximum allowable rms current

versus time conduction and initial
case temperature

I

(A)

T(RMS)

10

Tj max= 135 °C (the failure mode will be short circuit)

9

8

7

6

5

4

3

2

1

0

0.1 1.0 10.0 100.0

TCinitial=25°C

TCinitial=65°C

TCinitial=45°CTCinitial=45°C

tP(s)

TO-220AB

Figure 11. Holding current versus gate-cathode resistance (typical values)

IH(mA)

1000

100

10

RGK()

1

1 10 100 1000

Ω

4/13 Doc ID 3768 Rev 3

Tj=25 °C

TN22 Application information

FLUORESCENT

TUBE

MAINS

VOLTAGE

SWITCH

INDUCTANCE

BALLAST

Rectifier

Reset control

Ignition circuit

Preheating
time control

Voltage detector

SCR

mains

mains

-

+

D2 – D5

TN22

+

C1

+

C2

R1

R4

R3

R2

D6

D1

I

T

V

S

1

2

3

4

5

Starter circuit

2 Application information

2.1 Overview

The TN22 has been designed for use as a fluorescent tube starter switch.

As shown in Figure 12, the starter circuit is divided in five parts:

1. Rectifier bridge: to rectify mains voltage.

2. Volt a g e dete c to r: RCD circuit used to switch on the TN22.

3. Preheating time control: RC circuit used to switch on the SCR, so turn off the TN22.

4. Ignition circuit: made of sensitive SCR and TN22 devices.

5. Reset control: resistor used to discharge the C2 capacitor and to reset the circuit.

Figure 12. Electronic starter schematic

FLUORESCENT

Preheating
time control

Doc ID 3768 Rev 3 5/13

Application information TN22

Three steps are necessary to ignite a fluorescent tube (see Figure 13):

● preheating of the filament

● ignition of the tube

● "lighting" mode

Figure 13. The three operating steps of the electronic starter:

preheating, ignition and lighting

Preheating

Preheating

Lighting

IT(1 A/div)

IT(1 A/div)

VS(500 V/div)

VS(500 V/div)

Lighting

2.2 Filament and tube preheating

The mains voltage is applied across the circuit and when it reaches a higher level than the
zener clamping voltage (V
The TN22 switches on when the voltage across its gate to cathode junction reaches the
triggering gate level (V

As the TN22 is in on-state, a full sinusoidal current flows through the filaments (primary of
the rectifier bridge) that are warmed up. This current is limited by the input ballast. The TN22
remains on at each current zero crossing point because the gate is still powered by the C1
capacitor.

The preheating time duration is set with the RC circuit made of R3, R2 and C2, and
according to the voltage polarization fixed by the D1 drop voltage.

The preheating time is typically in the range of 2 to 3 seconds depending on the tube
characteristics.

), a current flows through the resistor R1 and the capacitor C1.

CL

).

GT

Ignition

Ignition

6/13 Doc ID 3768 Rev 3

TN22 Application information

2.3 Ignition step

When C2 is charged above the SCR triggering gate voltage (VGT), the SCR switches on.
The voltage across the TN22 gate to cathode junction is fixed to a negative value, which
allows a proper TN22 switch-off, with a high holding current (I

When the current reaches I

, the TN22 switches off and the ballast inductor generates a

H

high voltage pulse across the tube (see Figure 14). This over-voltage is clamped by the
TN22 to a value fixed by the breakdown voltage (V

). A 1200 V to 1500 V level is

BR

necessary to ensure a correct ignition of the fluorescent tubes.

Figure 14. Typical high voltage pulse of an electronic starter circuit

(P0130AA SCR, TN22)

VBR1300 V≈

VS(200 V/div)

IH225 mA≈

IT(50 mA/div)

) level.

H

If the lamp is not ignited after the first pulse, the starter circuit starts a new ignition
sequence. The pulse is regenerated until ignition of the tube lamp. If the lamp is not ignited
after several attempts, the starter circuit can automatically stop the ignition sequence.

Figure 15. Repetitive ignitions sequence

2.4 Lighting state

When the lamp is ignited, the capacitor C2 is discharged through the resistors R2, R3 and
R4. The voltage across the lamp remains lower than the D6 clamping voltage (V
avoiding the triggering of the TN22. The starter circuit remains in stand-by mode.

Pulse

f

BURST

Mains voltage

= 50 Hz

IT(500 mA /div)

VS(500 V/div)

CL

),

Doc ID 3768 Rev 3 7/13

Ordering information scheme TN22

3 Ordering information scheme

Figure 16. Ordering information scheme

TN 2 2 - 1500 x -TR

Startlight device

On-state rms current

2 = 2 A

Triggering gate current (MAX)

2 = 1.5 mA

Breakdown voltage

1500 = 1500 V

Package

B = DPAK
H = IPAK
T = TO-220AB
R = I2PA K

Packing

Blank = Tube

-TR = Tape and reel (DPAK)

8/13 Doc ID 3768 Rev 3

TN22 Package information

4 Package information

● Epoxy meets UL94,V0

● Cooling method: by convection

● Recommended torque value: 0.4 to 0.6 N·m (TO-220AB)

In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com
ECOPACK

Table 5. DPAK dimensions

®

packages, depending on their level of environmental compliance. ECOPACK®

®

is an ST trademark.

.

Dimensions

Ref.

Millimeters Inches

Min. Max. Min. Max.

A 2.20 2.40 0.086 0.094

E

B2

L2

H

L4

B

G

A1

A

C2

A1 0.90 1.10 0.035 0.043

A2 0.03 0.23 0.001 0.009

B 0.64 0.90 0.025 0.035

B2 5.20 5.40 0.204 0.212

R

D

C 0.45 0.60 0.017 0.023

C2 0.48 0.60 0.018 0.023

R

C

D 6.00 6.20 0.236 0.244

E 6.40 6.60 0.251 0.259

0.60 MIN.

A2

G 4.40 4.60 0.173 0.181

H 9.35 10.10 0.368 0.397

V2

L2 0.80 typ. 0.031 typ.

L4 0.60 1.00 0.023 0.039

Figure 17. Footprint (dimensions in mm)

6.7 3 3

6.7

Doc ID 3768 Rev 3 9/13

V2 0° 8° 0° 8°

1.6

2.3

2.3

1.6

Package information TN22

Table 6. IPAK dimensions

Dimensions

Ref.

Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

A 2.20 - 2.40 0.086 - 0.094

A1 0.90 - 1.10 0.035 - 0.043

A3 0.70 - 1.30 0.027 - 0.051

A

E

B2

L2

C2

B 0.64 - 0.90 0.025 - 0.035

B2 5.20 - 5.40 0.204 - 0.212

B3 - - 0.95 - - 0.037

B5 - 0.30 - - 0.035 -

D

C 0.45 - 0.60 0.017 - 0.023

C2 0.48 - 0.60 0.019 - 0.023

H

L1

L

B3

B

V1

A1

D 6 - 6.20 0.236 - 0.244

E 6.40 - 6.60 0.252 - 0.260

e - 2.28 - - 0.090 -

B5

e

G

C

A3

G 4.40 - 4.60 0.173 - 0.181

H-16.10- -0.634-

L 9 - 9.40 0.354 - 0.370

L1 0.8 - 1.20 0.031 - 0.047

L2 - 0.80 1 - 0.031 0.039

10/13 Doc ID 3768 Rev 3

V1 - 10° - - 10° -

TN22 Package information

Table 7. TO-220AB dimensions

Dimensions

L2

F2

F1

F

G1

H2

Dia

G

L5

L9

L6

L4

Ref.

Millimeters Inches

Min. Max. Min. Max.

A 4.40 4.60 0.173 0.181

C 1.23 1.32 0.048 0.051

A

C

D 2.40 2.72 0.094 0.107

E 0.49 0.70 0.019 0.027

L7

F 0.61 0.88 0.024 0.034

F1 1.14 1.70 0.044 0.066

F2 1.14 1.70 0.044 0.066

G 4.95 5.15 0.194 0.202

D

G1 2.40 2.70 0.094 0.106

H2 10 10.40 0.393 0.409

L2 16.4 typ. 0.645 typ.

M

E

L4 13 14 0.511 0.551

L5 2.65 2.95 0.104 0.116

L6 15.25 15.75 0.600 0.620

L7 6.20 6.60 0.244 0.259

L9 3.50 3.93 0.137 0.154

M 2.6 typ. 0.102 typ.

Diam. 3.75 3.85 0.147 0.151

Doc ID 3768 Rev 3 11/13

Ordering information TN22

5 Ordering information

Table 8. Ordering information

Order code Marking Package Weight Base qty Delivery mode

TN22-1500B TN22-1500 DPAK 0.3 g 75 Tube

TN22-1500B-TR TN22-1500 DPAK 0.3 g 2500 Tape and reel

TN22-1500H TN22-1500 IPAK 0.4 g 75 Tube

TN22-1500T TN22-1500 TO-220AB 2.0 g 50 Tube

6 Revision history

Table 9. Document revision history

Date Revision Changes

Oct-2000 1 First release.

17-Sep-2005 2 TO-220AB package added.

13-Aug-2009 3 Updated Figure 4. Added Figure 9 and 10.

12/13 Doc ID 3768 Rev 3

TN22

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Doc ID 3768 Rev 3 13/13