ICB2FL01GXT Infineon Technologies, ICB2FL01GXT Datasheet - Page 21

• Manufacturer Part Number: ICB2FL01GXT
• Manufacturer: Infineon Technologies

Specifications of ICB2FL01GXT

• Driver Type: Fluorescent Lamp
• Number Of Segments: 1
• Operating Temperature (min): -25C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Commercial
• Package Type: DSO
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

2.4.2 PFC Bus Voltage Sensing
Over voltage, open loop, bus 95 % and under voltage states (Figure 15) of the PFC bus voltage are
sensed at the PFCVS pin via the network R14, R15, R20 and C11 Figure 3 (C11 acts as a spike
suppression filter).
The bus voltage loop control is completely integrated (Figure 16) and provided by an 8 Bit sigma –
delta A/D – converter with a typical sampling rate of 280 µs and a resolution of 4 mV/Bit. After leaving
phase 2 (monitoring), the IC starts the power up (VCC > 14.1V). After power up, the IC senses for
80µs – 130µs the bus voltage below 12.5% (open loop) or above 105% (bus over voltage). In case of
a bus over voltage (V
off the gate drives of the PFC within 5µs respective in 1µs. In this case, the PFC restarts automatically
when the bus voltage is within the corridor (12.5% < V
the 80µs – 130µs valid, the bus voltage sensing is set to 12.5% < V
these thresholds for longer than 1µ (open loop) or 5µs (overvoltage) the PFC gate drive stops working
until the voltage drops below 105% or exceeds the 12.5% level. If the bus over voltage (> 109%) lasts
for longer than 625ms in run mode, the inverter gates also shut off and a power down with complete
restart is attempt (Figure 15).
Figure 15: PFC Bus Voltage Operating Level and Error Detection
When the rated bus voltage is in the corridor of 12.5% < V
the bus voltage exceeds the 95 % threshold (Figure 15 phase 3) within 80 ms before entering the soft
start phase 4. Another threshold is activated when the IC enters the run mode (phase 8). When the
rated bus voltage drops below 75% for longer than 84 µs, a power down with a complete restart is
attempted when a counter exceeds 800 ms. In case of a short term bus under voltage (the bus voltage
reaches its working level in run mode before exceeding typically 800 ms (min. 500ms) the IC skips
phases 1 until 5 and starts with ignition (condition for emergency lighting see 2.7.1). The internal
reference level of the bus voltage sense V
accuracy. A surge protection is activated in case of a rated bus voltage of V
current sense voltage of V
Datasheet
2.4.2.1
2.4.2.2
Bus Over Voltage and PFC Open Loop
Bus Voltage 95% and 75% Sensing
BUSrated
LSCS
> 109 %) or open loop (V
> 0.8V for longer as 500ns in PRE RUN and RUN Mode.
2
nd
Generation FL-Controller for FL-Ballasts
PFCVS
Page 21 of 56
is 2.5 V (100 % of the rated bus voltage) with a high
BUSrated
BUSrated
BUSrated
< 12.5 %) in phases 3 until 8 the IC shuts
< 105 %) again. Is the bus voltage after
< 109 %, the IC will check whether
BUSrated
Functional Description
< 109 %. In case leaving
BUS
> 109% and a low side
ICB2FL01G
V1.2