TN22 Fluorescent Tube Lamp Starter SCR - Characteristics and Application Information

Oct 12, 2026

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TN22 is a fluorescent tube electronic starter switch device developed for tube lamp starter circuits. It operates with a sensitive SCR to deliver high striking energy while requiring low triggering power. Key requirements include high clamping voltage (1200–1500 V), low gate triggering current for direct line drive (<1.5 mA), and high holding current (>175 mA) for reliable ignition. The document provides absolute ratings, electrical characteristics, thermal resistance, and application circuit breakdown into rectifier, detector, preheating control, ignition, and reset functions.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages13

Reading Time33 min

AccessFree to download

1 Characteristics

Table 1. Absolute ratings (limiting values)

Table 2. Electrical characteristics

Table 3. Static electrical characteristics

Table 4. Thermal resistance

Figures 1-11

2 Application information

2.1 Overview

Figure 12. Electronic starter schematic

| | TN22 | | --- | --- | | Fluorescent tube lamp starter SCR | | 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. 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. | 2, TAB

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TO-220AB TN22-1500T |

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IPAKTN22-1500H | |
DPAKTN22-1500B-TR | | August 2009 Doc ID 3768 Rev 3 1/13 1 Characteristics Table 1. Absolute ratings (limiting values) | Symbol | Parameter | | Value | Unit | | --- | --- | --- | --- | --- | | VRRM | Repetitive peak off-state voltage | Tj = 110 °C | 400 | V | | IT(RMS) | On-state rms current
full sine wave (180° conduction angle) | Tc = 95 °C | 2 | A | | IT(AV) | Mean on-state current
Full sinewave (180° conduction angle) | Tc = 95 °C | 1.8 | A | | ITSM | Non repetitive surge peak on-state current (Tj initial = 25 °C) | tp = 8.3 ms | 22 | A | | | | tp = 10 ms | 20 | | | I2t | I2t Value for fusing | tp = 10 ms | 2 | A2s | | dl/dt | Critical rate of rise of on-state current
IG = 5 mA dIG/dt = 70 mA/µs | | 50 | A/µs | | PG(AV) | Average gate power dissipation | | 300 | mW | | P GM | Peak gate power dissipation | tp = 20 µs | 2 | W | | IGM | Peak gate current | tp = 20 µs | 1 | A | | VRGM | Maximum peak reverse gate voltage | | 6 | V | | Tstg
Tj | Storage and operating junction temperature range | | -40 to +150
-40 to +110 | °C | | TL | Maximum lead temperature for soldering during 10 s at 4.5 mm from case | | 260 | °C | Table 2. Electrical characteristics (Tj = 25 °C unless otherwise stated) | Symbol | Test conditions | | Value | Unit | | --- | --- | --- | --- | --- | | IGT | VD=12 V (DC), RL= 33 Ω | MAX | 1.5 | mA | | V GT | VD=12 V (DC), RL= 33 Ω, RGK = 1 KΩ | MAX | 3 | V | | IH | VGK = 0 V | MIN | 175 | mA | | dV/dt | Linear slope up to VD = 67% V DRM, VGK = 0 V, Tj = 110 °C | MIN | 500 | V/µs | | V BR | ID = 5 mA, VGK = 0 V | MIN | 1200 | V | | | | MAX | 1500 | | Table 3. Static electrical characteristics (Tj = 25 °C unless otherwise stated) | Symbol | Test conditions | | Value | Unit | | --- | --- | --- | --- | --- | | V TM | ITM = 2 A tp = 380 µs | MAX | 3.1 | V | | IDRM | VDRM rated | MAX | 0.1 | mA | Table 4. Thermal resistance | Symbol | Parameter | | Value | Unit | | --- | --- | --- | --- | --- | | Rth(j-a) | Junction to ambient | DPAK / IPAK | 100 | °C/W | | | | TO-220AB | 60 | | | Rth(j-c) | Junction to case | | 3 | °C/W | 2/13 Doc ID 3768 Rev 3 TN22 Characteristics Figure 1. Maximum average power dissipation versus average on-state current (rectified sine wave) Figure 2. Average on-state current versus case temperature (rectified full sine wave) | 6
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0.0 | | | --- | --- | --- | --- | | 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 | | | | Figure 3. Average on-state current versus ambient temperature, free air convection (rectified full sine wave) Figure 4. Variation of thermal impedance junction to ambient versus pulse duration | 0.7
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0.1 | | | --- | --- | --- | --- | | | | 1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03 | | Figure 5. Relative variation of gate trigger current and holding current versus junction temperature Figure 6. Surge peak on-state current versus number of cycles | 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 | IGT, IH [Tj] / IGT, IH [Tj=

FAQs

What is the TN22 designed for in fluorescent tube systems?

TN22 is designed for use as a fluorescent tube starter switch in tube lamp electronic starter circuits, in conjunction with a sensitive SCR to achieve the ignition function.

What are the TN22 key electrical features for reliable triggering?

It provides high clamping voltage structure (1200 to 1500 V), low gate triggering current for direct drive from line (< 1.5 mA), and high holding current (> 175 mA) to ensure high striking energy.

How is the fluorescent tube starter circuit organized in the application section?

The starter circuit is divided into five parts: rectifier bridge, voltage detector, preheating time control, ignition circuit, and reset control, as illustrated in the electronic starter schematic.

Oct 12, 2026

Upload by Liam