IRDC3899-P1V2
9/18/2012
12
THERMAL IMAGES Vin=12.0V, Vo=1.2V, Io=0-9A, Room Temperature, No Air flow
Fig. 17: Thermal Image of the board at 9A load
Test point 1 is IR3899
Test point 2 is inductor
Page 1: ...external frequency synchronization with smooth clocking internal LDO and pre bias start up Output over current protection function is implemented by sensing the voltage developed across the on resista...
Page 2: ...vide the desired tracking ratio between output voltage and the tracking input CONNECTIONS and OPERATING INSTRUCTIONS LAYOUT The PCB is a 4 layer board 2 23 x2 using FR4 material All layers use 2 Oz co...
Page 3: ...IRDC3899 P1V2 9 18 2012 3 Connection Diagram Vin Gnd Gnd Vout Enable VDDQ Vref Sync S Ctrl AGnd PGood Vsns Vcc Vcc Top View Bottom View Fig 1 Connection Diagram of IR3899 98 97 Evaluation Boards...
Page 4: ...IRDC3899 P1V2 9 18 2012 4 Fig 2 Board Layout Top Layer Fig 3 Board Layout Bottom Layer Single point connection between AGnd and PGnd...
Page 5: ...IRDC3899 P1V2 9 18 2012 5 Fig 5 Board Layout Mid Layer 2 Fig 4 Board Layout Mid Layer 1...
Page 6: ...ohm SYNC 1 C16 47uF Agnd 1 C17 47uF R7 N A C18 47uF C19 47uF C20 47uF R13 0 ohm C25 N S C23 2 2uF S_Ctrl 1 C12 1nF A 1 B 1 R18 49 9K C1 330uF 25V R50 0 ohm C27 N S VCC C8 2200pF VCC Input ceramic 1206...
Page 7: ...7nF 0603 25V X7R 10 Murata GRM188R71E472KA01J 10 1 C32 1 0uF 0603 25V X5R 10 Murata GRM188R61E105KA12D 11 1 L1 1 0uH SMD 6 36x6 56x3mm 5 62m Coilcraft XAL6030 102ME 12 1 R1 5 23K Thick Film 0603 1 10W...
Page 8: ...Fig 10 Output Voltage Ripple 9A load Ch1 Vout Fig 11 Inductor node at 9A load Ch2 LX Fig 8 Start up at 9A Load Ch1 Vin Ch2 Vo Ch3 Pgood Ch4 Vcc Fig 7 Start up at 9A Load Ch1 Vin Ch2 Vo Ch3 PGood Ch4 E...
Page 9: ...IRDC3899 P1V2 9 18 2012 9 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 0 9A Room Temperature no air flow Fig 13 Transient Response 0A to 3A step Ch1 Vout Ch4 Iout...
Page 10: ...IRDC3899 P1V2 9 18 2012 10 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 0 9A Room Temperature no air flow Fig 14 Bode Plot at 9A load shows a bandwidth of 78 13KHz and phase margin of 55 5 degrees...
Page 11: ...ficiency versus load current TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 1 2V Io 0 9A Room Temperature no air flow 74 76 78 80 82 84 86 88 90 0 9 1 8 2 7 3 6 4 5 5 4 6 3 7 2 8 1 9 Efficiency Io A 0 0 0 2...
Page 12: ...IRDC3899 P1V2 9 18 2012 12 THERMAL IMAGES Vin 12 0V Vo 1 2V Io 0 9A Room Temperature No Air flow Fig 17 Thermal Image of the board at 9A load Test point 1 is IR3899 Test point 2 is inductor...
Page 13: ...be placed to an accuracy of 0 050mm on both X and Y axes Self centering behavior is highly dependent on solders and processes and experiments should be run to confirm the limits of self centering on s...
Page 14: ...indow in order to accommodate any layer to layer misalignment i e 0 1mm in X Y However for the smaller Signal type leads around the edge of the device IR recommends that these are Non Solder Mask Defi...
Page 15: ...lder paste to make good solder joints with the ground pad high reductions sometimes create similar problems Stencils in the range of 0 125mm 0 200mm 0 005 0 008 with suitable reductions give the best...
Page 16: ...90245 USA Tel 310 252 7105 TAC Fax 310 252 7903 This product has been designed and qualified for the Industrial market Visit us at www irf com for sales contact information Data and specifications sub...
