ICB2FL02G Datasheet, PDF (12/55 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
Functional Description
2.2 Normal Start Up
This chapter describes the basic operation flow (8 phases) from the UVLO (Under Voltage Lock Out)
into Run Mode without any error detection. For detailed infromation see the following chapters 2.2.1
and 2.2.2. Figure 4 shows the 8 different phases during a typical start form UVLO (phase 1 Figure 4)
to Run Mode (phase 8 Figure 4) into normal Operation (no failure detected).
In case the AC line input is switched ON, the V_CC voltage rises to the UVLO threshold V_CC = 10.6 V (no
IC activities during UVLO). If V_CC exceeds the first threshold of V_CC = 10.6 V, the IC starts the first level
of detection activity, the high and low side filament detection during the Start Up Hysteresis (phase 2
Figure 4).
Frequency /
Lamp Voltage
135 kHz
100 kHz
50 kHz
42 kHz
0 kHz
Rated BUS
Voltage VBUS
1
60ms
2
35ms
Frequency
3
4
5
80ms 11ms
Lamp Voltage
0 - 2500ms
6
40 - 237ms
7
625ms
8
Mode /
Time
100 %
95 %
Rated BUS Voltage
30 %
Chip Supply
Voltage VCC
VCC = 17.5 V
VCC = 14.1 V
Chip Supply Voltage
Mode /
Time
VCC = 10.6 V
VCC = 0 V
UVLO
Monitoring Start UpSoft Start Preheating
Ignition
Pre-Run
Mode /
Time
Run Mode
into normal Operation
Figure 4 Typical Start Up Procedure in Run Mode (in normal Operation)
Followed by the end of the Start Up Hysteresis (phase 2 Figure 4) V_CC > 14.1 V and before phase 3 is
active, a second level of detection activity senses for 130 µs (propagation delay of the IC) whether the
rated bus voltage is below 12.5 % or above 105 %. If the previous bus voltage conditions are fulfilled
and the filaments are detected, the IC starts the operation with an internally fixed startup frequency of
typically 135 kHz (all gates are active). In case the bus voltage reaches a level of 95% of the rated bus
voltage within latest 80ms (phase 3 Figure 4), the IC enters the Soft Start. During the Soft Start (phase
4 Figure 4), the Start Up frequency shifts from 135 kHz down to the set preheating frequency (chapter
2.2.2). In the Soft Start phase, the lamp voltage rises and the chip supply voltage reaches its working
level from 10.6 V < V_CC < 17.5 V. After finish the Soft Start, the IC enters the Preheating mode (phase
5 Figure 4) for preheating the filaments (adjustable time) in order to extend the life cycle of the FL
filaments. By finishing the preheating, the controller starts the Ignition (phase 6 Figure 4). During the
Ignition phase, the frequency decreases from the set preheating frequency down to the set operation
frequency (adjustable see chapter 2.2.2). If the Ignition is successful, the IC enters the Pre – Run
mode (phase 7 Figure 4).
Preliminary Datasheet
Page 12 of 55
ICB2FL02G
V1.2