ICB2FL03G Datasheet, PDF (16/60 Pages) Infineon Technologies AG – 2nd Generation FL Controller for Fluorescent Lamp Ballasts

ICB2FL03G
Controller for Fluorescent Lamp Ballasts
Functional Description
2.2.1 Operating Levels from UVLO to Soft Start
This section describes the operating flow from phase 1 (UVLO) to phase 4 (soft start) in detail. The control of the
ballast is able to start the operation within less than 100 ms (IC in active mode). This is achieved by a small start-
up capacitor (about 1 μF C12 and C13 – fed by start-up resistors R11 and R12 in Figure 3) and the low current
consumption during the UVLO (I_VCC = 130 μA – phase 1, Figure 5) and start-up hysteresis (I_VCC = 160 μA – defines
the start-up resistors – phase 2, Figure 5) phases. The chip supply stage of the IC is protected against overvoltage
via an internal Zener clamping network, which clamps the voltage at 16.3 V and allows a current of 2.5 mA. For
clamping currents above 2.5 mA, an external Zener diode (D9, Figure 3) is required.¹⁾
Frequency /
Lamp Voltage
135 kHz
Frequency
100 kHz
V_{BU S}
100 %
95 %
Lamp Voltage
30 %
V_CC
17.5 V
16.0 V
14.0 V
10.6 V
I_VCC
V_RES
1.6 V
I_RES
I_LVS
1
UVLO
130 µA
2
Monitoring
3
4
Start Up Soft Start
< 160 µA
< 6.0 mA + I_Gate
- 21.3 µA
> 18 µA
< 210µA_pp
Figure 5 Typical Startup Procedure in Run Mode (in Normal Operation)
1) I_Gate depends on MOSFET
Final Data Sheet
16
V1.1, 2013-08-14