TN22. Fluorescent tube lamp starter SCR. Features. Description

Transcription

1 Fluorescent tube lamp starter SCR Features High clamping voltage structure (00 to 500 V) Low gate triggering current for direct drive from line (<.5 ma) High holding current (> 75 ma), ensuring high striking energy Description The 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, starters based on this device can offer high reliability levels and extended life time of the fluorescent tube lamps. TAB 3 TO-0AB -500T, TAB TAB 3 3 TAB DPAK -500B-TR 3 IPAK -500H August 009 Doc ID 3768 Rev 3 /3 3

2 Characteristics Characteristics Table. Absolute ratings (limiting values) Symbol Parameter Value Unit V RRM Repetitive peak off-state voltage T j = 0 C 400 V I T(RMS) On-state rms current full sine wave (80 conduction angle) T c = 95 C A I T(AV) Mean on-state current Full sinewave (80 conduction angle) T c = 95 C.8 A Non repetitive surge peak on-state current t p = 8.3 ms A (T j initial = 5 C) t p = 0 ms 0 I t I t Value for fusing t p = 0 ms A s I TSM dl/dt Critical rate of rise of on-state current I G = 5 ma di G /dt = 70 ma/µs 50 A/µs P G(AV) Average gate power dissipation 300 mw P GM Peak gate power dissipation t p = 0 µs W I GM Peak gate current t p = 0 µs A V RGM Maximum peak reverse gate voltage 6 V T stg T j T L Table. Storage and operating junction temperature range Maximum lead temperature for soldering during 0 s at 4.5 mm from case -40 to to +0 Electrical characteristics (T j = 5 C unless otherwise stated) C 60 C Symbol Test conditions Value Unit I GT V D = V (DC), R L = 33 Ω MAX.5 ma V GT V D = V (DC), R L = 33 Ω, R GK = KΩ MAX 3 V I H V GK = 0 V MIN 75 ma dv/dt Linear slope up to V D = 67% V DRM, V GK = 0 V, T j = 0 C MIN 500 V/µs V BR Table 3. I D = 5 ma, V GK = 0 V MIN 00 MAX 500 Static electrical characteristics (Tj = 5 C unless otherwise stated) Symbol Test conditions Value Unit V TM I TM = A t p = 380 µs MAX 3. V I DRM V DRM rated MAX 0. ma Table 4. Thermal resistance Symbol Parameter Value Unit R th(j-a) Junction to ambient DPAK / IPAK 00 TO-0AB 60 C/W R th(j-c) Junction to case 3 C/W V /3 Doc ID 3768 Rev 3

3 Characteristics Figure. Maximum average power dissipation versus average on-state current (rectified sine wave) Figure. Average on-state current versus case temperature (rectified full sine wave) 6 5 P(W) α=30 α=60 α=90 α=0 α= I T(AV) (A) α= I T(AV) (A) T C ( C) 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 I T(AV) (A) TO-0AB α= Z th(j-a) ( C/W) DPAK IPAK TO-0AB DPAK / IPAK.0 0. T amb ( C) t P (s).e-03.e-0.e-0.e+00.e+0.e+0.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 I GT,I H [T j ]/I GT,I H [T j =5 C] I GT I H typical values T j ( C) I TSM (A) tp=0ms One cycle T j initial=5 C Number of cycles Doc ID 3768 Rev 3 3/3

4 Characteristics Figure 7. Non-repetitive surge peak on-state current for a sinusoidal pulse Figure 8. On-state characteristics (maximum values) 000 I TSM (A), I²t (A²s) di/dt limitation 50 A/µs T j initial=5 C 00.0 I TM (A) I TSM 0 t p < 0 ms and corresponding value of I t.0 T j =0 C T j =5 C I²t t P (ms) V TM (V) T j max. : V to =.5 V R D = 35 mω Figure 9. Maximum allowable rms current versus time conduction and initial case temperature Figure 0. Maximum allowable rms current versus time conduction and initial case temperature 0 9 I T(RMS) (A) Tj max= 35 C (the failure mode will be short circuit) 0 9 I T(RMS) (A) Tj max= 35 C (the failure mode will be short circuit) T C initial=5 C T C initial=45 C DPAK IPAK T C initial=5 C T C initial=65 C T C initial=45 C TO-0AB T C initial=65 C t P (s) t P (s) Figure. Holding current versus gate-cathode resistance (typical values) 000 I H (ma) T j =5 C 00 0 R GK ( Ω) /3 Doc ID 3768 Rev 3

5 Application information Application information. Overview The has been designed for use as a fluorescent tube starter switch. As shown in Figure, the starter circuit is divided in five parts:. Rectifier bridge: to rectify mains voltage.. Voltage detector: RCD circuit used to switch on the. 3. Preheating time control: RC circuit used to switch on the SCR, so turn off the. 4. Ignition circuit: made of sensitive SCR and devices. 5. Reset control: resistor used to discharge the C capacitor and to reset the circuit. Figure. Electronic starter schematic Starter circuit SWITCH INDUCTANCE BALLAST mains R I T MAINS VOLTAGE FLUORESCENT TUBE mains - + D D5 V S D6 + C SCR R + C R3 R4 D 4 Ignition circuit 3 Preheating time control Rectifier Voltage detector 5 Reset control Doc ID 3768 Rev 3 5/3

6 Application information Three steps are necessary to ignite a fluorescent tube (see Figure 3): preheating of the filament ignition of the tube "lighting" mode Figure 3. The three operating steps of the electronic starter: preheating, ignition and lighting Preheating I T ( A/div) Lighting V S (500 V/div) Ignition. 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 CL ), a current flows through the resistor R and the capacitor C. The switches on when the voltage across its gate to cathode junction reaches the triggering gate level (V GT ). As the 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 remains on at each current zero crossing point because the gate is still powered by the C capacitor. The preheating time duration is set with the RC circuit made of R3, R and C, and according to the voltage polarization fixed by the D drop voltage. The preheating time is typically in the range of to 3 seconds depending on the tube characteristics. 6/3 Doc ID 3768 Rev 3

7 Application information.3 Ignition step When C is charged above the SCR triggering gate voltage (V GT ), the SCR switches on. The voltage across the gate to cathode junction is fixed to a negative value, which allows a proper switch-off, with a high holding current (I H ) level. When the current reaches I H, the switches off and the ballast inductor generates a high voltage pulse across the tube (see Figure 4). This over-voltage is clamped by the to a value fixed by the breakdown voltage (V BR ). A 00 V to 500 V level is necessary to ensure a correct ignition of the fluorescent tubes. Figure 4. Typical high voltage pulse of an electronic starter circuit (P030AA SCR, ) VBR 300 V VS (00 V/div) IH 5 ma IT (50 ma/div) 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 5. Repetitive ignitions sequence Pulse I T (500 ma /div) Mains voltage f BURST = 50 Hz V S (500 V/div).4 Lighting state When the lamp is ignited, the capacitor C is discharged through the resistors R, R3 and R4. The voltage across the lamp remains lower than the D6 clamping voltage (V CL ), avoiding the triggering of the. The starter circuit remains in stand-by mode. Doc ID 3768 Rev 3 7/3

8 Ordering information scheme 3 Ordering information scheme Figure 6. Ordering information scheme TN x -TR Startlight device On-state rms current = A Triggering gate current (MAX) =.5 ma Breakdown voltage 500 = 500 V Package B = DPAK H = IPAK T = TO-0AB R = IPAK Packing Blank = Tube -TR = Tape and reel (DPAK) 8/3 Doc ID 3768 Rev 3

9 Package information 4 Package information Epoxy meets UL94,V0 Cooling method: by convection Recommended torque value: 0.4 to 0.6 N m (TO-0AB) In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: ECOPACK is an ST trademark. Table 5. DPAK dimensions Ref. Millimeters Dimensions Inches Min. Max. Min. Max. A E B C A A A L B H R D B C L4 G B A C R C D E MIN. A G H V L 0.80 typ typ. L V Figure 7. Footprint (dimensions in mm) Doc ID 3768 Rev 3 9/3

10 Package information Table 6. IPAK dimensions Dimensions Ref. Millimeters Inches Min. Typ. Max. Min. Typ. Max. A A A A B E C B B L B B D C H L L B3 B V A C D E e G B5 C A3 e G H L L L V /3 Doc ID 3768 Rev 3

11 Package information Table 7. TO-0AB dimensions Dimensions Ref. Millimeters Inches Min. Max. Min. Max. A H Dia L5 A C L7 C D E F L F L6 F F G F L9 D G F L4 H L 6.4 typ typ. G G M E L L L L L M.6 typ. 0.0 typ. Diam Doc ID 3768 Rev 3 /3

12 Ordering information 5 Ordering information Table 8. Ordering information Order code Marking Package Weight Base qty Delivery mode -500B -500 DPAK 0.3 g 75 Tube -500B-TR -500 DPAK 0.3 g 500 Tape and reel -500H -500 IPAK 0.4 g 75 Tube -500T -500 TO-0AB.0 g 50 Tube 6 Revision history Table 9. Document revision history Date Revision Changes Oct-000 First release. 7-Sep-005 TO-0AB package added. 3-Aug Updated Figure 4. Added Figure 9 and 0. /3 Doc ID 3768 Rev 3

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