IK Semicon ILA3354 Ic for electronic ballast Datasheet

TECHNICAL DATA
ILA3354
IC for Electronic Ballasts
Short Description
Features
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.
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.
1
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 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 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 µs
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<1µs with max. repeat
frequency = 200kHz
switching output current
junction temperature
storage temperature
ambient temperature
ESD protection
Pin
VCC
VCC
EI
LW
Symbol
ICCeff
ICCM
VErr
VLW
LW
VLW - VCC
TM
TR
ITM
ITR(neg.)
S
I
S
j
Tstg
Tamb
VESD
min
-0.3
-0.3
max
20
100
VCC
15
unit
mA
mA
V
V
6
V
1
mA
mA
1
150
150
120
2
mA
°C
°C
°C
kV
-500
T
-50
-20
2
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 Ω
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
Pin
VCC
Symbol
Vlim
VCC
ICC(on)
TR
tTRW
TR
typ
11.4
max
12
unit
V
1.25
1.5
mA
900
1000
1100
µs
ITRM
400
650
850
mA
TR
tTR
0.6
0.9
1.5
µs
TR
VTRsat
380
500
mV
S
VSsat
0.2
0.45
V
EI
KOL
3.60
3.75
3.90
V
TS
95
105
115
°C
3.25
V
V
V
LW
VLE
LW
VLV
min
10.8
4.25
Parameter
Condition
Threshold for connecting the trigger pulses during
build-up phase
Threshold for release of the internal reset
CC
Value
Unit
CClock = 82pF
7
V
CClock = 82pF
8
V
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
6
V
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
Control current of the turn-off transistor
CClock = 82pF
840
µs
CClock = 82pF
10
mA
Temperature hysteresis for re-ignition after
CClock = 82pF
overtemperature switch-off ( pin TM is connected to
ground )
10
°C
3
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
4
ILA3354
Principle Circuit Diagram
ILA3354
Application Circuit Diagram
5
ILA3354
Package Dimension
N SUFFIX PLASTIC DIP
(MS – 001BA)
A
Dimension, mm
5
8
B
1
4
MIN
MAX
A
8.51
10.16
B
6.1
7.11
5.33
C
L
F
Symbol
C
D
0.36
0.56
F
1.14
1.78
-T- SEATING
PLANE
N
G
K
D
0.25 (0.010) M
M
H
J
T
NOTES:
1. Dimensions “A”, “B” do not include mold flash or protrusions.
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
G
2.54
H
7.62
J
0°
10°
K
2.92
3.81
L
7.62
8.26
M
0.2
0.36
N
0.38
6
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