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IR3897 Datasheet(PDF) 39 Page - International Rectifier

Part # IR3897
Description  4A HIGHLY INTEGRATED SUPLRBUCK
PDF  45 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3897 Datasheet(HTML) 39 Page - International Rectifier

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AUGUST 08, 2012 |DATA SHEET |    Rev 3.3
39
IR3897 
4A Highly Integrated SupIRBuck
TM  
Single‐Input Voltage, Synchronous Buck Regulator  
PD‐97663
TYPICAL OPERATING WAVEFORMS 
Vin = 12V, Vo = 1.2V, Iout = 0‐4A, Room Temperature, No Air Flow  
 
  
 
 
 
 
 
Figure 43: Feed Forward for Vin change from 7 to16V   
 
                   Figure 44: Start/Stop using S‐Ctrl pin,  
             and back to 7V, Ch2:Vo, Ch4:Vin   
 
 
              Ch1:Enable, Ch2:Vo, Ch3:pGood, Ch4:S‐Ctrl 
 
 
 
 
 
 
 
Figure 45: External Frequency Synchronization to  
 
Figure 46: Over Voltage protection,  
    800KHz from free running 600KHz , Ch1:LX, Ch2:Vo,Ch4‐Rt/Sync                                                 Ch2‐Vo,Ch3‐PGood 
 
 
 
 
 
 
 
Figure 47: Voltage Margining using Vref pin                            
       48: Voltage tracking using Vp pin     
 
 
     Ch2‐Vo,Ch3‐Vref,Ch4‐PGood 
 
 
 
           Ch2‐Vo,Ch3‐Vp,Ch4‐PGood



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