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International Rectifier IR3821, User Manual, Page: 14 / 16

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International Rectifier IR3821 User Manual Download Page 14

IRDC3821

Rev 0.1
01/07/2008

Solder Resist

It is recommended that the lead lands are Non Solder Mask Defined (NSMD). The solder resist 
should be pulled away from the metal lead lands by a minimum of 0.025mm to ensure NSMD 
pads.

The land pad should be Solder Mask Defined (SMD), with a minimum overlap of the solder resist 
onto the copper of 0.05mm to accommodate solder resist mis-alignment. 

Ensure that the solder resist in between the lead lands and the pad land is 

≥

0.15mm due to the 

high aspect ratio of the solder resist strip separating the lead lands from the pad land.

Summary of Contents for IR3821

Page 1: ...nput under voltage lockout for proper start up and pre bias start up An output over current protection function is implemented by sensing the voltage developed across the on resistance of the synchron...

Page 2: ...ld be connected to Vcc and Vcc CONNECTIONS and OPERATING INSTRUCTIONS LAYOUT The PCB is a 4 layer board All of layers are 2Oz copper The IR3821 SupIRBuck and all of the passive components are mounted...

Page 3: ...IRDC3821 Rev 0 1 01 07 2008 3 Fig 1 Connection diagram of IR3821 evaluation board Vin 12v GROUND Connection Diagram VCC GROUND PGood VOUT 1 8v GROUND...

Page 4: ...IRDC3821 Rev 0 1 01 07 2008 4 Fig 2 Board layout top overlay Fig 3 Board layout bottom overlay rear view...

Page 5: ...IRDC3821 Rev 0 1 01 07 2008 5 Fig 4 Board layout mid layer I Fig 5 Board layout mid layer II Single point connection between AGND and PGND AGND Plain PGND Plain...

Page 6: ...Vcc 1 C2 10uF C5 N S R9 0 R1 21k R10 Open C3 10uF R3 30 1K R4 1 96K R2 60 4k C4 10uF C15 22uF R6 20 C16 22uF C25 0 1uF C17 22uF R12 6 98K J1 SS C9 Open C18 22uF C19 22uF C20 22uF A 1 B 1 D2 Open 1 2 R...

Page 7: ...d BAT54S 12 1 L1 1 0uH SMT Inductor 2 3mOhm 20 11 5x 10mm Delta MPL105 1R0 13 1 R1 21 0K Thick film 1 10W 1 0603 Vishey Dale CRCW060321K0FKEA 14 1 R3 30 1K Thick film 1 10W 1 0603 Vishey Dale CRCW0603...

Page 8: ...pple 7A load Ch3 Vout Ch4 Iout Fig 11 Inductor node at 7A load Ch1 LX Ch4 Iout Fig 12 Short Hiccup Recovery Ch2 VSS Ch3 Vout Fig 9 Pre Bias Start up 0A Load Ch1 Vin Ch2 VSS Ch3 Vout Fig 8 Start up at...

Page 9: ...IRDC3821 Rev 0 1 01 07 2008 9 TYPICAL OPERATING WAVEFORMS Vin Vcc 12V Vo 1 8V Io 3 5A 7A Room Temperature No Air Flow Fig 13 Transient Response 3 5A to 7A step Ch3 Vout Ch4 Iout...

Page 10: ...IRDC3821 Rev 0 1 01 07 2008 10 TYPICAL OPERATING WAVEFORMS Vin Vcc 12V Vo 1 8V Io 7A Room Temperature No Air Flow Fig 14 Bode Plot at 7A load shows a bandwidth of 62 kHz and phase margin of 51 degrees...

Page 11: ...ATING WAVEFORMS Vin 12V Vo 1 8V Io 0 7A Room Temperature No Air Flow 50 60 70 80 90 0 5 1 5 2 5 3 5 4 5 5 5 6 5 Load Current A Efficiency Efficiency VCC VIN 12V Efficiency VIN 12V VCC 5V 0 0 0 5 1 0 1...

Page 12: ...IRDC3821 Rev 0 1 01 07 2008 12 THERMAL IMAGES Vin Vcc 12V Vo 1 8V Io 7A Room Temperature No Air Flow Fig 17 Thermal Image at 7A load Test point 1 is the IR3821...

Page 13: ...h should be equal to the maximum part lead length 0 3 mm outboard extension The outboard extension ensures a large and inspectable toe fillet The pad lands the 4 big pads other than the 11 IC pins len...

Page 14: ...minimum of 0 025mm to ensure NSMD pads The land pad should be Solder Mask Defined SMD with a minimum overlap of the solder resist onto the copper of 0 05mm to accommodate solder resist mis alignment...

Page 15: ...e the occurrences of lead shorts If too much solder is deposited on the center pad the part will float and the lead lands will be open The maximum length and width of the land pad stencil aperture sho...

Page 16: ...St El Segundo California 90245 USA Tel 310 252 7105 TAC Fax 310 252 7903 This product has been designed and qualified for the Consumer market Visit us at www irf com for sales contact information Dat...

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