ICB2FL03G Infineon Technologies, ICB2FL03G Datasheet - Page 18

• Manufacturer Part Number: ICB2FL03G
• Description: LED Drivers
• Manufacturer: Infineon Technologies

Specifications of ICB2FL03G

• Packages: PG-DSO-16
• Lead Free Status / Rohs Status: Details
• Other names: ICB2FL03GXT

During ignition (phase 6,
(t
with an 11.0 kΩ resistor). During this frequency shifting, the voltage and current in the resonant circuit will rise
when the operation is close to the resonant frequency with increasing voltage across the lamp. The ignition control
is activated if the sensed slope at the LSCS pin reaches typically 205 mV/µs ± 25 mV/µs and exceeds the 0.8 V
threshold. This stops the decrease of the frequency and waits for ignition. The ignition control is now continuously
monitored by the LSCS pin. The maximum duration of the ignition procedure is limited to 237 ms. If there is no
ignition within this time frame, the ignition control is disabled and the IC changes over into the latched fault mode.
Furthermore, in order to reduce the size of the lamp choke, the ignition control is designed to operate with a lamp
choke in magnetic saturation during ignition. For operation in magnetic saturation during ignition; the voltage at
the shunt at the LSCS pin 2 has to be V
the IC enters the pre-run mode (phase 7,
malfunction of the IC due to an unstable system – e.g., the lamp parameters are not in a steady state condition.
After 625 ms pre-run mode, the IC changes to the run mode (phase 8,
complete system regarding bus over- and undervoltage, open loop, overcurrent of PFC and / or inverter, lamp
overvoltage (EOL1) and rectifier effect (EOL2) (see
Figure 8
mode. The lamp voltage rises by the end of the preheating phase with decreasing frequency (e.g., 100 kHz to
50 kHz) up to, for example, 700 V during ignition. After ignition, the lamp voltage drops down to its working level
with continuous decreasing of the frequency
the RFRUN pin to ground). After decreasing of the frequency stops, the IC enters the pre-run mode.
Figure 7
Preliminary Data Sheet
max
= 237 ms) to the run frequency set by a resistor (R21 in
shows the lamp voltage versus the frequency during the different phases from preheating to the run
1000
900
800
700
600
500
400
300
200
100
Lamp Voltage versus Frequency during the different Startup Phases
10000
0
Operation with Load
Operation without Load
Figure
Lamp Voltage vs Frequency @ different Modes
6), the operating frequency of the inverter is shifted downward in t
LSCS
After Ignition
Figure
= 0.75 V when the ignition voltage is reached. If ignition is successful,
Frequency [Hz]
(Figure
RUN Mode
6). The pre-run mode is a safety mode in order to prevent a
PRE Run
Section
8) down to its working level e.g. 45 kHz (set by a resistor at
and
18
Before Ignition
Controller for Fluorescent Lamp Ballasts
2.5) and capacitive loads 1 and 2 (see
Figure
IGNITION
After
IGNITION
3) at pin RFRUN to GND (typically 45 kHz
Figure
6). The run mode monitors the
100000
Functional Description
1000
900
800
700
600
500
400
300
200
100
0
Pre Heating
V1.1, 2012-04-10
ICB2FL03G
Section
typ
= 40 ms
2.6).