ICB2FL03G Datasheet, PDF (12/60 Pages) Infineon Technologies AG – 2nd Generation FL Controller for Fluorescent Lamp Ballasts

ICB2FL03G
Controller for Fluorescent Lamp Ballasts
Pin Configuration and Functionality
overvoltage threshold operates with a hysteresis of 100 mV (4 % of the rated bus voltage). For the detection of
successful start-up, the bus voltage is sensed at 95 % (2.375 V). It is recommended to use a small capacitor
between this pin and GND as a spike suppression filter.
In run mode, a PFC overvoltage stops the PFC gate drive within 5 μs. As soon as the bus voltage is less than
105 % of the rated level, the gate drives are enabled again. If the overvoltage lasts for longer than 625 ms, inverter
overvoltage is detected and the inverter turns off the gate drives also. This causes powerdown and powerup when
V_BUS < 109 %.
A bus undervoltage (V_BUS > 75 %) or inverter overvoltage during run mode is handled as a fault U. In this situation
the IC changes into powerdown mode and generates a delay of 100 ms by an internal timer. Then startup
conditions are checked and if valid, a further startup is initiated. If startup conditions are not valid, a further delay
of 100 ms is generated.
This procedure is repeated a maximum of seven times. If startup is successful within these seven cycles, the
situation is interpreted as a short interruption of the mains supply and the preheating is skipped. Any further startup
attempt is initiated to include the preheating.
RFRUN (set R for run frequency, pin 9)
A resistor from this pin to ground sets the operating frequency of the inverter during run mode. The typical run
frequency range is 20 kHz to 120 kHz. The set resistor R_RFRUN can be calculated, based on the run frequency
f_RUN according to the equation:
R_FRUN
=
5 ⋅10⁸ ΩHz
f _RUN
RFPH (set R for preheat frequency, pin 10)
A resistor from this pin to ground, together with the resistor at pin 9, sets the operating frequency of the inverter
during preheating mode. The typical preheating frequency range is from the run frequency (as a minimum) to
150 kHz. The set resistor R_RFPH can be calculated, based on the preheating frequency f_PH and the resistor
R_RFRUN according to the equation:
R_RFPH =
R_RFRUN
f _PH ⋅ R_{RFRUN − 1}
5 ⋅10⁸ ΩHz
RTPH (set R for preheating time, pin 11)
A resistor from this pin to ground sets the preheating time of the inverter during preheating mode. A set resistor
range from zero to 25 kΩ corresponds to a range of preheating times from zero to 2500 ms subdivided into 127
steps, as expressed below:
R_RTPH
= ^{t Pr eHeating}
ms
100
kΩ
LVS (lamp voltage sense, pin 12)
Before startup this pin senses a current fed from the rectified line voltage via resistors through the high-side
filaments of the lamp for detection of an inserted lamp.
Final Data Sheet
12
V1.1, 2013-08-14