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11

DEMO MANUAL DC275

DC/DC CONVERTER

PCB LAYOUT A  D FIL

U

W

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

Bottom Solder Mask

Bottom Silkscreen

Bottom Pastemask

Summary of Contents for LTC1702

Page 1: ...outputs PGOOD1 and PGOOD2 that indicate whether either output has risen to within 5 of the final output voltage An optional latching fault mode protects the load if the output rises 15 above the inten...

Page 2: ...D3 D4 ON SEMICONDUCTOR MBRS340T3 Q1 TO Q8 FAIRCHILD FDS6670A D1 E2 PWRGD1 E3 SD1 E8 GND L1 1 H C11 180 F C10 180 F C9 180 F C4 10 F C16 1 F C24 1 F C17 1 F C1 330 F C2 330 F C3 330 F Q7 Q5 Q8 Q6 D4 C...

Page 3: ...omm Con 626 301 4200 JP4 1 3801S 03G2 0 100 CC 3 Pin Jumper Comm Con 626 301 4200 JP1 JP4 2 CCIJ230 G 0 100 CC Shunt Comm Con 626 301 4200 L1 L2 2 CEP125 1R0MC H or 1 H 20A SMT Inductor Sumida 847 956...

Page 4: ...ier wire soldered to the terminals 5 Connect an ammeter in series with each of the output loads to measure output currents 6 The SD1 and SD2 pins should be left floating for normal operation and tied...

Page 5: ...o additional capacitance is needed Capacitor Considerations TheinputcapacitorsareKemetT510X337K010AS 330 F 10V tantalums The input capacitors must be rated for the RMS input ripple A good rule of thum...

Page 6: ...application will place a different value on a few points of efficiency Shutdown Soft Start Each half or the LTC1702 has a RUN SS pin This pin performs two functions when pulled to ground each shuts do...

Page 7: ...that can precisely tailor the loop response The high gain bandwidth prod uct allows the loop to be crossed over beyond 50kHz while maintaining good stability and significantly enhances load transient...

Page 8: ...forms the switch node and should be kept as small as possible to minimize radiated emissions It must also be large enough to carry the full rated output current 2 The SW1 and the SW2 pins should be c...

Page 9: ...9 DEMO MANUAL DC275 DC DC CONVERTER PCB LAYOUT A D FIL U W Top Solder Mask Top Silkscreen Top Pastemask...

Page 10: ...10 DEMO MANUAL DC275 DC DC CONVERTER PCB LAYOUT A D FIL U W Layer 1 Top Layer Layer 2 VIN Plane Layer 3 GND Plane Layer 4 Bottom Layer...

Page 11: ...y Corporation is believed to be accurate and reliable However no responsibility is assumed for its use Linear Technology Corporation makes no represen tationthattheinterconnectionofitscircuitsasdescri...

Page 12: ...THICKNESS 0 062 0 006 TOTAL OF 4 LAYERS 2 FINISH ALL PLATED HOLES 0 001 MIN 0 0015 MAX COPPER PLATE ELECTRODEPOSITED TIN LEAD COMPOSITION BEFORE REFLOW SOLDER MASK OVER BARE COPPER SMOBC 3 SOLDER MAS...

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