IRS2552DSTRPBF International Rectifier, IRS2552DSTRPBF Datasheet - Page 19

• 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

Soft start
In addition the IRS2552D includes a soft start function that operates at the start of each burst, during dimming
operation when VDIM < VDIM
start of each burst from CR = 0 V to CR = VCR
will linearly increase to 50% (minus the dead time) when VCR reaches VCR
RUN mode and allows inrush currents to be eliminated during burst mode dimming, while always maintaining the
frequency at F
www.irf.com
0.2V
DIM
VDIM <VCRSS
VCRSS <VDIM<VDIMSS
VDIM>VDIMSS
HO
LO
MIN
1V
5V
.
increases from 10%
Soft Start
Duty cycle
to 50%
ICCRUN charges CR up to VCR+. CR oscillates at fCR (sawtooth)
SS
. The soft start will operate during the portion of the dimming ramp CR at the
CR
Half-bridge oscillates at FMIN. VDC reset to 0V
DC increases from DC
SOFT START
min to DC max
VCR<VCRSS
VCR<VCRSS
Figure 4: Dimming waveform
Soft Start
SS
. When VCR = 0 the duty cycle will be at minimum (DCMIN) and
RUN MODE
19
DC=DCmax
VCR<VDIM
VCR<VDIM
ON
Soft Start
SS
. This function is enabled only in
VCR>VDIM
VCR>VDIM
VCR>VDIM
DC=0
OFF
© 2009 International Rectifier
IRS2552D