ILA3354 IKSEMICON | Alldatasheet

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Technical content

Features

Overtemperature protection without external components Malfunction detection Timer output Automatical reignition after lamp change Pinning Pin 1 TM temperature mode selection Pin 2 CT clock generator Pin 3 TR trigger output, turn-off attenuation, oscillation detector Pin 4 GND connection to ground Pin 5 EI error indication input Pin 6 LW input of lamp change Pin 7 S switching output of the timer Pin 8 VCC supply voltage Block diagram Characteristics of the IC

  • The ILA3354 is a control- and monitoring-IC to drive an electronic ballast for fluorescent lamps.
  • The IC actuates the oscillation of a self-oscillating circuit for generation of RF-shaped lamp current by means of trigger pulses. After successful excitation the oscillation is monitored and further trigger pulses are blocked.
  • The IC has a timer with low-active output which is activated for one second after supply voltage was applied. The switching output is effective for pre-heating and ignition systems.
  • The IC consists an error indication input. In case of error indication the IC stops oscillation. Enquiry cycles realize interference reduction.
  • After lamp change the IC starts oscillation again.
  • The IC protects from overtemperature cutting oscillation. It is programmable when the oscillator circuit shall be triggered again.

At the moment of current feeding at terminal VCC, the IC generates the supply voltage via backup capacitor externally connected. As soon as an internal switching threshold of 7 V is reached, trigger pulses are delivered at the output TR with a repetition instalment of 960 µs. After successful triggering of the oscillator circuit, an oscillation detector guarantees blocking of further trigger pulses. It identifies a stable oscillating process, after a minimum of oscillations is detected per timing. As soon as a switching threshold of 8 V is reached, all logic units are reset and the timer output S is activated as well. The IC starts a counter, which interrups the control after one second. Furthermore, the IC monitors the temperature and the oscillation circuit from a supply voltage of 8 V. The comparator input EI is useful for error detection. Voltage > 3.75 V, applied at EI, are evaluated as error signals. The error signal is enqired and registered within a cycle repeating every 960 µs. After registration of the error signal, a counter starts to generate a delay of one second. After this delay time, the voltage at EI is evaluated again. The error storage is set only after a second error, appearing within a directly following evaluation cycle. This error storage is resettable by a short-time power supply disconnection, or with input LW connected via a change of lamp. The error storing causes the cutting further triggers and the control of the turn-off transistor as well, which turns the output TR to ground. Therefore, the turn-off transistor prevents the control of the oscillator circuit, attenuating it extremly quickly. Thereby, the current consumption increases by the control of the turn-off transistor. This current amounts more than 5 mA, that the supply voltage across the backup capacitor at pin VCC breaks down (because nominal current feed is less 5 m A). With a switching threshold of 6 V, the control current of the turn-off transistor is switched off, that enables the supply voltage to rise up to the limiting voltage. Because the trigger pulse gate, blocked by the error memory, the oscillation can’t start again. With error storing and attenuation of the oscillation by overtemperature it can be defined via selection of the temperature mode, whether the oscillation is automatically triggered after cooling-down of the assembly, or only after mains disconnection. Absolute Maximum Ratings Pin Symbol min max unit current consumption VCC ICCeff 20 mA peak current for t< 100 µs VCC ICCM 100 mA input voltage error indicator EI VErr -0.3 VCC V V input voltage lamp exchange input LW VLW -0.3 15 voltage difference between VLW and VCC for divider factor 16 via LW LW VLW - VCC 6 V input current at pin TM TM ITM 1 mA negative current load for t<1µs with max. repeat frequency = 200kHz TR ITR(neg.) -500 mA switching output current S IS 1 mA junction temperature Tj 150 °C storage temperature Tstg -50 150 °C ambient temperature Tamb -20 120 °C ESD protection VESD 2 kV

with Tamb = 25 °C, VCC = 10 V, unless specified otherwise Pin Symbol min typ max unit range for internal voltage limitation VCC Vlim 10.8 11.4 12 V quiescent current consumption VCC ICC(on) 1.25 1.5 mA trigger repeat rate with CClock = 82pF TR tTRW 900 1000 1100 µs output pulse current on 10 Ω TR ITRM 400 650 850 mA output pulse width with 90% amplitude TR tTR 0.6 0.9 1.5 µs saturation voltage of turn-off transistor with I=450 mA TR VTRsat 380 500 mV saturation voltage of switching output S VSsat 0.2 0.45 V response level of error voltage EI KOL 3.60 3.75 3.90 V switching point of overtemperature turn-off TS 95 105 115 °C switching range to indicate a lamp as removed LW VLE 3.25 V switching range to indicate a lamp as applied LW VLV 4.25 VCC V Parameter Condition Value Unit Threshold for connecting the trigger pulses during build-up phase CClock = 82pF 7 V Threshold for release of the internal reset CClock = 82pF 8 V Threshold for switching-off the control of the turn-off transistor with set error memory CClock = 82pF 6 V Delay of response with error detection CClock = 82pF 1 s Duration for activation switching output CClock = 82pF 1 s Duration needed for rating at least 4 pulse-shaped distortions or a static error signal with twice interrogation within delay time 1 sec CClock = 82pF 840 µs Control current of the turn-off transistor CClock = 82pF 10 mA Temperature hysteresis for re-ignition after overtemperature switch-off ( pin TM is connected to ground ) CClock = 82pF 10 °C

Current consumption vs. supply voltage Voltage limiting vs. temperature ICC = 5 mA Static overload threshold VCC = 10 V Timer output saturation voltage at 1mA V CC = 10 V Trigger current at 10 vs. temperature, VCC = 10 V Trigger pulse width (90% amplitude) vs. temperature, VCC = 10 V

Application Circuit Diagram

(MS – 001BA) Symbol MIN MAX A 8.51 10.16 B 6.1 7.11 C 5.33 D 0.36 0.56 F 1.14 1.78 G H J 0° 10° K 2.92 3.81 NOTES: L 7.62 8.26 1. Dimensions “A”, “B” do not include mold flash or protrusions. M 0.2 0.36 Maximum mold flash or protrusions 0.25 mm (0.010) per side. N 0.38 Dimension, mm 2.54 7.62 L H M J A B F G D SEATING PLANE N K 0.25 (0.010) M T -T- C