ICB2FL02G Datasheet, PDF (6/55 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
1
Pin Configuration and Description
1.1 Pin Configuration
Pin Symbol Function
1 LSCS Low side current sense (inverter)
2 LSGD Low side Gate drive (inverter)
3 V_CC
Supply voltage
4 GND
Low side Ground
5 PFCGD PFC Gate drive
6 PFCCS PFC current sense
7 PFCZCD PFC zero current detector
8 PFCVS PFC voltage sense
9 RFRUN Set R for run frequency
10 RFPH Set R for preheat frequency
11 RTPH Set R for preheating time
12 RES
Restart after lamp removal
13 LVS1
Lamp voltage sense 1
14 LVS2
Lamp voltage sense 2
15 AUX
Auxiliary output
16
Creepage distance
17 HSGND High side ground
18 HSVCC High side supply voltage
19 HSGD High side Gate drive (inverter)
20
Not connected
LSCS
1
20
LSGD
2
19
VCC
3
18
GND
4
17
PFCGD
5
16
PFCCS
6
15
PFCZCD
7
14
PFCVS
8
13
RFRUN
9
12
RFPH
10
11
PG-DSO-19-1 (300mil)
Figure 2 Package PG-DSO-19-1
N.C.
HSGD
HSVCC
HSGND
AUX
LVS2
LVS1
RES
RTPH
1.2 Pin Description
LSCS (Low-side current sense, Pin 1)
This pin is directly connected to the shunt
resistor which is located between the Source
terminal of the low-side MOSFET of the inverter
and ground.
Internal clamping structures and filtering
measures allow for sensing the Source current
of the low side inverter MOSFET without
additional filter components.
There is a first threshold of 0.8V. If this
threshold is exceeded for longer than 500ns
during preheat or run mode, an inverter over
current is detected and causes a latched shut
down of the IC. The ignition control is activated
if the sensed slope at the LSCS pin reaches
typically 205 mV/µs ± 25 mV/µs and exceeds
the 0.8V threshold. This stops the decreasing of
the frequency and waits for ignition. The ignition
control is now continuously monitored by the
LSCS PIN. The Ignition control is designed to
handle a choke operation in saturation while
ignition in order to reduce the choke size.
If the sensed current signal exceeds a second
threshold of 1.6V for longer than 500ns during
start-up, soft start, ignition mode and pre-run,
the IC changes over into a latched shut down.
There are further thresholds active at this pin
during run mode that detects a capacitive mode
operation. A threshold of -50mV senses the
current before the high-side MOSFET is turned
on. A voltage level below of this threshold
indicates a faulty operation (Capload 2). Finally
a second threshold at 2.0 V senses even short
overcurrent during turn-on of the high-side
MOSFET such as they are typical for reverse
recovery currents of a diode (Capload 2). If one
of these comparator thresholds indicate wrong
operating conditions for longer than 620µs
(Capload 2) in run mode, the IC turns off the
Gates and changes into fault mode due to
detected capacitive mode operation (non-zero
voltage switching).
The threshold of -50mV is also used to adjust
the dead time between turn-off and turn-on of
the half-bridge drivers in a range of 1.05µs to
2.0µs during all operating modes.
Preliminary Datasheet
Page 6 from 55
ICB2FL02G
V1.2