ICB1FL03G Infineon Technologies, ICB1FL03G Datasheet - Page 29

• Manufacturer Part Number: ICB1FL03G
• Description: IC SMART BALLAST CONTROL DSO18
• Manufacturer: Infineon Technologies
• Type: PFC/Ballast Controllerr

Specifications of ICB1FL03G

• Frequency: 20 ~ 100 kHz
• Current - Supply: 5mA
• Voltage - Supply: 8.4 V ~ 17 V
• Operating Temperature: -25°C ~ 125°C
• Package / Case: 20-SOIC (0.300", 7.50mm Width) 18 leads
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Details

7
7.1
After turning on the mains switch the peak value of the rectified AC input voltage is available at C02 and smoothing
capacitor C10 (Fig. 17). Via R11 and R12 the supply voltage increases at bypass capacitors C12 and C13. At a
level of 10,5V a source current out of pin RES is sensing the existence of the low-side filament of the fluorescent
lamp. Fed from the BUS voltage a current is detected at pin LVS via R41, R42, R43, when the high-side filament
is connected. The current fed into pin LVS is used to charge C12 via internal clamping diode. The IC changes into
active mode when Vcc level achieves the turn-on threshold of 14V and both filaments are detected.
The active IC is sensing the BUS voltage level via R14, R15. Gate drives are disabled when open loop or
overvoltage are detected. If BUS voltage level is within the allowed range, the low-side Gate drive is starting with
the first pulse of the 125kHz softstart frequency. Only few cycles are required to charge the bootstrap capacitor
C14 via D6, R30 and Q3. Without R30 there is a risk of overcurrent shut down by exceeding the 1,6V threshold
at pin LSCS. The power supply is generated by a charge pump C16, D7 and D8. In normal operation C16 is
charged and discharged via C17 from the current forced by the resonance inductor L2 during the deadtime of the
inverter producing a zero voltage switching (ZVS) operation. Run frequency, preheating frequency and preheating
time are set by resistors R21, R22 and R23.
Figure 17
During run mode the lamp voltage is sensed via R41, R42, R43 in order to detect an abnormal increasing of lamp
voltage or an rectifier effect that can occur at end-of-life conditions of the lamp. At the pin RES there is also
detected a non-ZVS operation, classified into Capmode1 and Capmode2. This will be done by the capacitive
divider C18, C19, that transfers the divided AC-part of the inverter output voltage to pin RES. Dependent on the
shape of the signal two different time windows can be started at abnormal conditions in order to protect the ballast.
Zener diode D61 limits voltage transients at pin RES that can occur during removal of the lamp.
Voltage mode preheating is done by two separate windings on the resonant inductor L2. The bandpass filters L21,
C21 and L22, C22 are designed to pass preheating current at preheating frequency only and to block any current
during run mode. Ignition is provided by shifting the operating frequency towards the resonant frequency of L2
and C20. The voltage level during ignition is limited by the current sensed at Shunt resistors R24, R25 with a level
of 0,8V at pin LSCS. Overcurrents that exceed a voltage level of 1,6V for longer than 400ns will disable the IC at
any time and change into fault mode.
The PFC preconverter with L1, Q1 and D5 is starting with a fixed frequent operation and change over to a critical
conduction mode (CritCM) as soon as the level at pin PFCZCD is sufficient to trigger the operation. During light
load the operation mode changes into discontinuous conduction mode (DCM). Compensation of the voltage
Preliminary Datasheet Version 1.02
90 ... 270 VAC
PE
Application Examples
Operating Behaviour of a Ballast for a single Fluorescent Lamp
Application circuit of a Ballast for a single Fluorescent Lamp with voltage mode Preheating.
L10
C1
C5
C4
D1...4
C3
C2
R2
R3
R1
L1
Q1
R11
R12
R18 R19
C10
C12
D9
D5
C11
R34
R16
R14
R15
R13
R20
SMD
C61
PFCZCD
PFCGD
PFCVS
PFCCS
29
R21R22R23
C13
HSGND
HSVCC
HSGD
LSGD
LSCS
C14
R61
R26
R27
D6
R30
D61
SMD-Z
R41
R35
R24R25
Q2
Q3
C15
C18
C16
C19
C17
Application Examples
D7
D8
R42 R43
L22
L2
L21 C21
C20
K4
K6
C22
ICB1FL03G
K2
March 2009
K1
K3
K5
R36