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IP1206PBF Datasheet(PDF) 15 Page - International Rectifier

Part # IP1206PBF
Description  Synchronous Buck Multiphase Optimized LGA Power Block
PDF  30 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IP1206PBF Datasheet(HTML) 15 Page - International Rectifier

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2/26/2008
www.irf.com
15
iP1206PbF
Fault Protection
The iP1206 monitors the output voltage for over voltage protection and power good indication. It senses
the R
ds(on) of low side MOSFET for over current protection. It also protects the output for prebias
conditions. Fig. 15 below shows the IC’s operating waveforms under different fault conditions.
t0 –t1: Vcc, VCH and Enable signals passed their respective UVLO threshold. Soft start sequence starts.
t1 –t2: Power Good signal flags high.
t1 –t3: Output voltage ramps up and reaches the set voltage.
t4 –t5: OC event, SS ramps down. IC in Hiccup mode.
t5–t6: OC is removed, recovery sequence, fresh SS.
t6 –t7: Output voltage reaches the set voltage.
t8: OVP event. HDrv turns off and LDrv Turns on. The IC latches off.
t9 –t10: Manually recycled the Vcc after latched OVP.
t
11: PreBias start up.
Fig. 15: Fault Conditions
SS
PGood
t1 t2 t3
Vo
1.0V
1.8V
90%Vfb
Set Voltage
OCP Threshold
Iout
3V
POR
t0
t4
t5
t6
t7
t8
t9
t10
Pre_Bias Voltage
t11



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