IRS2552DSTRPBF International Rectifier, IRS2552DSTRPBF Datasheet - Page 16

• Manufacturer Part Number: IRS2552DSTRPBF
• Description: IC BALLAST CTLR CCFL/EEFL 16SOIC
• Manufacturer: International Rectifier
• Type: CCFL/EEFL Controllerr

Specifications of IRS2552DSTRPBF

• Frequency: 39 ~ 69 kHz
• Current - Supply: 10mA
• Current - Output: 450mA
• Voltage - Supply: 10.6 V ~ 15.6 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: IRS2552DSTRPBFTR

Oscillator
During UVLO and shutdown and the voltage at the MIN and MAX pins remain at 0 V. When V
V
pin sources 5 V and the resistance connected from this point to COM determines the C
consequently the frequency. R
frequency. In IGNITION mode the MAX pin supplies 5 V to R
charging current and consequently a higher ignition frequency, as R
MAX pin is no longer active and the voltage will drop to 0V. C
threshold and then it is discharged rapidly to V
producing a saw tooth waveform. The MIN pin sources 5 V during IGNITION and RUN modes. The current
flowing through F
current reference for the currents supplied from the CD and CR pins.
Deadtime
In the IRS2552D the dead time is determined by an independent external timing circuit comprising of R
C
high. C
the start of the dead time. The dead time ends when C
remain consistent over the working range of V
Ignition
During the IGNITION phase the C
reaches V
at the CS pin is less than VCS
the IRS2552D will shut down until V
function is achieved by applying a frequency somewhat above resonance to the output step up transformer and
resonant load. This should develop sufficient voltage across the lamps to allow partial ignition and some arc
current to flow. The combined lamp current is fed back to the CS pin through a suitable isolating network to
determine whether the lamps have ignited successfully. If a successful ignition is detected after the voltage at C
has reached V
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CCUV+
DT
and is not affected by the values of C
the oscillator will start and LO and HO will produce output drive waveforms at frequency F
DT
is charged through R
CR+
then if the voltage at CS is greater than VCS
CR+
MIN
then R
to COM determines the charging current of C
MAX
is disconnected inside the IRS2552D and the frequency will switch immediately to
IGN
VCCUV+
1/3*VCC
DT
MIN
VCC
VCT+
VCT-
HO
, which is connected to VCC, when DT is internally disconnected from COM at
LO
CT
DT
the IRS2552D will enter FAULT mode whereby LO and HO will both go low and
R
is always connected from the MIN pin to COM, which sets the RUN mode
capacitor is charged through an internal current source ICR_IGN. When C
CC
Figure 3: Oscillator waveforms
is reduced below V
T
, R
CC
MIN
CT-
, i.e. from UVLO+ to the clamp voltage of 15.6 V.
or R
. It then begins to charge again, repeating this sequence and
MAX
DT
. The DT pin voltage is held at COM when LO or HO is
16
IGN
has charged to 1/3 V
CCUV-
MAX
, the IRS2552D will enter RUN mode. If the voltage
, which is connected to COM setting a higher C
and then increased above V
T
charges until the voltage reaches the 5 V
T
MAX
during RUN mode and also serves as a
is smaller than R
CC
. This allows the dead time to
© 2009 International Rectifier
T
MIN
charging current and
. In RUN mode the
CC
CCU+
IRS2552D
is raised above
MAX
. The ignition
. The MAX
DT
and
R
R
T