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TECHNICAL DATA
IC for Electronic Ballasts
Short Description
The bipolar monolithic integrated circuit triggers, monitors and turns-off RF-oscillation of an electronic ballast for fluorescent lamps dependent on several controland monitoring functions.
ILA3354
Features
Minimum wiring complexity Overtemperature protection without external components Malfunction detection Timer output Automatical reignition after lamp change
Pinning
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 TM CT TR GND EI LW S
VCC
temperature mode selection clock generator trigger output, turn-off attenuation, oscillation detector connection to ground error indication input input of lamp change switching output of the timer 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.
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ILA3354
Functional Description 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 s. 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 s. 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 mA). 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
current consumption peak current for t< 100 s input voltage error indicator input voltage lamp exchange input voltage difference between VLW and VCC for divider factor 16 via LW input current at pin TM negative current load for t<1s with max. repeat frequency = 200kHz switching output current junction temperature storage temperature ambient temperature ESD protection Pin VCC VCC EI LW LW Symbol ICCeff ICCM VErr VLW VLW - VCC min max 20 100 VCC 15 6 unit mA mA V V V
-0.3 -0.3
TM TR
ITM ITR(neg.)
I
1 -500
mA mA
S
S j Tstg Tamb VESD
T
-50 -20
1 150 150 120 2
mA C C C kV
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ILA3354
Characteristics
with Tamb = 25 C, VCC = 10 V, unless specified otherwise range for internal voltage limitation quiescent current consumption trigger repeat rate with CClock = 82pF output pulse current on 10 output pulse width with 90% amplitude saturation voltage of turn-off transistor with I=450 mA saturation voltage of switching output response level of error voltage switching point of overtemperature turn-off switching range to indicate a lamp as removed switching range to indicate a lamp as applied Parameter Threshold for connecting the trigger pulses during build-up phase Threshold for release of the internal reset Pin VCC VCC TR TR TR TR Symbol Vlim ICC(on) tTRW ITRM tTR VTRsat 900 400 0.6 min 10.8 typ 11.4 1.25 1000 650 0.9 380 max 12 1.5 1100 850 1.5 500 unit V mA s mA s mV
S EI
VSsat KOL TS 3.60 95
0.2 3.75 105
0.45 3.90 115 3.25
V V C V V
LW LW
VLE VLV 4.25
V
CC
Condition CClock = 82pF CClock = 82pF
Value 7 8 6 1 1 840
Unit V V V s s s
Threshold for switching-off the control of the turn-off CClock = 82pF transistor with set error memory Delay of response with error detection CClock = 82pF Duration for activation switching output Duration needed for rating at least 4 pulse-shaped distortions or a static error signal with twice interrogation within delay time 1 sec Control current of the turn-off transistor CClock = 82pF CClock = 82pF
CClock = 82pF
10 10
mA C
Temperature hysteresis for re-ignition after CClock = 82pF overtemperature switch-off ( pin TM is connected to ground )
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ILA3354
Current consumption vs. supply voltage
Voltage limiting vs. temperature ICC = 5 mA
Static overload threshold VCC = 10 V
Timer output saturation voltage at 1mA VCC = 10 V
Trigger current at 10 vs. temperature, VCC = 10 V
Trigger pulse width (90% amplitude) vs. temperature, VCC = 10 V
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ILA3354
Principle Circuit Diagram
ILA3354
Application Circuit Diagram
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ILA3354
Package Dimension
N SUFFIX PLASTIC DIP (MS - 001BA)
A 8 5 B 1 4
Dimension, mm Symbol A B MIN 8.51 6.1 MAX 10.16 7.11 5.33 0.36 1.14 2.54 7.62 0 2.92 7.62 0.2 0.38 10 3.81 8.26 0.36 0.56 1.78
F
L
C D
C -T- SEATING
PLANE
F G
M H J
N G D 0.25 (0.010) M T K
H J K L M N
NOTES: 1. Dimensions "A", "B" do not include mold flash or protrusions. Maximum mold flash or protrusions 0.25 mm (0.010) per side.
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