ICB2FL02G Datasheet, PDF (9/55 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
During typical start-up with connected filaments
of the lamp a current source I_RES3 (-21.3 µA) is
active as long as V_CC > 10.6V and V_RES < V_RES1
(1.6V). An open low-side filament is detected,
when V_RES > V_RES1. Such a condition will
prevent the start-up of the IC. In addition the
comparator threshold is set to V_RES2 (1.3V) and
the current source changes to I_RES4 (-17.7 µA).
Now the system is waiting for a voltage level
lower than V_RES2 at the RES pin that indicates a
connected low-side filament, which will enable
the start-up of the IC.
An open high-side filament is detected when
there is no sink current I_LVSSINK (>18 µA) into
both of the LVS pins before the V_CC Start-up
threshold is reached. Under these conditions
the current source at the RES pin is I_RES1
(-42.6 µA) as long as V_CC > 10.6V and V_RES
< V_RES1 (1.6V) and the current source is I_RES2
(-35.4 µA) when the threshold has changed to
V_RES2 (1.3V). In this way the detection of the
high-side filament is mirrored to the levels on
the RES pin.
There is a further threshold of 3.2V active at the
RES pin during run mode. If the voltage level
rises above this threshold for longer than
620µs, the IC changes over into latched fault
mode.
In any case of fault detection with different
reaction times the IC turns-off the Gate drives
and changes into power down mode with a
current consumption of 170 µA max. An internal
timer generates a delay time of 200 ms, before
start-up conditions are checked again. As soon
as start-up conditions are valid, a second start-
up attempt is initiated. If this second attempt
fails, the IC remains in latched fault mode until
a reset is generated by UVLO or lamp removal.
The RES PIN can be deactivated via set the
PIN to GND (durable).
LVS1 (Lamp voltage sense 1, Pin 13)
Before start-up this pin senses a current fed
from the rectified line voltage via resistors
through the high-side filaments of the lamp for
the detection of an inserted lamp.
The sensed current fed into the LVS pin has to
exceed 12 µA typically at a voltage level of 6.0
V at the LVS pin. The reaction on the high side
filament detection is mirrored to the RES pin
(see pin 12). In addition the detection of
available mains supply after an interruption is
sensed by this pin. Together with pin LVS2 and
pin RES the IC can monitor the lamp removal of
totally four lamps. If the functionality of this pin
is not required, e.g. for single lamp designs, it
can be disabled by connecting this pin to
ground.
During run mode the lamp voltage is monitored
with this pin by sensing a current proportional to
the lamp voltage via resistors. An overload is
indicated by an excessive lamp voltage. If the
peak to peak lamp voltage effects a peak to
peak current above a threshold of 210µA_PP for
longer than 620µs, a fault EOL1 (end-of-life) is
assumed. If the DC current at the LVS pin
exceeds a threshold of ±42µA for longer than
2500ms, a fault EOL2 (rectifier effect) is
assumed. The levels of AC sense current and
DC sense current can be set separately by
external RC network. Note, in case of a
deactivation of the LVS1/2 PIN, a reactivation
starts, when the voltage at LVS1/2 PIN exceeds
V_LVSEnable1 in RUN Mode.
LVS2 (Lamp voltage sense 2, Pin 14)
LVS2 has the same functionality as pin LVS1
for monitoring in parallel an additional lamp
circuitry.
AUX (Auxiliary output, Pin 15)
This pin provides a control current for a NPN
bipolar transistor during DCM operating mode
of the PFC section. There is a source current of
-450µA plus the current which is fed into pin
PFCZCD from the detector winding available
only during the enlarged off-time. That differ the
discontinuous conduction mode (DCM) from the
critical conduction mode (CritCM). With this
transistor a resistor for damping oscillations can
be switched to the ZCD winding in order to
minimize the line current harmonics during
DCM operating mode. If this function is not
used, this pin has to be not connected.
Pin 16 Not Existing
PIN 16 does not exist, in order to provide a
wider creepage distance to the high-side gate
driver. Please pay attention to relevant
standards.
HSGND (High-side ground, Pin 17)
This pin is connected to the Source terminal of
the high-side MOSFET which is also the node
of high-side and low-side MOSFET. This pin
represents the floating ground level of the high-
side driver and the high-side supply.
Preliminary Datasheet
Page 9 of 55
ICB2FL02G
V1.2