background image

3

DEMO MANUAL DC275

DC/DC CONVERTER

REFERENCE
DESIGNATOR

QUANTITY

PART NUMBER

DESCRIPTION

VENDOR

TELEPHONE

C1 to C3

3

T510X337K010AS

330

µ

F 10V 10% Tantalum Capacitor

Kemet

(408) 986-0424

C4

1

1206ZG106ZAT1A

10

µ

F 10V Y5V Capacitor

AVX

(843) 946-0362

C5 to C8, C16,

9

06036D105MAT1A

1

µ

F 6V X5R Capacitor

AVX

(843) 946-0362

C17, C20, C23
C24

C9 to C12,

8

EEFUEOG181R

180

µ

F 4V SP Capacitor

Panasonic

(714) 373-7334

C19, C25 to
C27

C13

1

06035C821MAT1A

820pF 50V X7R Capacitor

AVX

(843) 946-0362

C14, C18

2

06035C681MAT1A

680pF 50V X7R Capacitor

AVX

(843) 946-0362

C15, C21

2

06035A270MAT1A

27pF 50V NPO Capacitor

AVX

(843) 946-0362

C22

1

06035C332MAT1A

3300pF 50V X7R Capacitor

AVX

(843) 946-0362

D1, D2

2

MBR0520LT1

Schottky Diode

ON Semiconductor

(602) 244-6600

D3, D4

2

MBRS340T3

Schottky Diode

ON Semiconductor

(602) 244-6600

E1, E4, E8 to E11

6

2501-2

1-Pin Terminal

Mill-Max

(516) 922-6000

E2, E3, E5 to E7

5

2308-2

1-Pin Terminal

Mill-Max

(516) 922-6000

JP1 to JP3

3

3801S-02G2

0.100"CC 2-Pin Jumper

Comm 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

µ

H 20A SMT Inductor

Sumida

(847) 956-0667

ETQP6F1R0SSP

Panasonic

(714) 373-7334

Q1 to Q8

8

FDS6670A

SO-8 N-Channel MOSFET

Fairchild

(408) 822-2126

R1

1

CR16-100JM

10

 1/16W 5% Chip Resistor

Tad

(714) 255-9123

R2, R10

2

CR16-273JM

27k 1/16W 5% Chip Resistor

Tad

(714) 255-9123

R3

1

CR16-122JM

1.2k 1/16W 5% Chip Resistor

Tad

(714) 255-9123

R4, R5

2

CR16-1002FM

10k 1/16W 1% Chip Resistor

Tad

(714) 255-9123

R6

1

CR16-4022FM

40.2k 1/16W 1% Chip Resistor

Tad

(714) 255-9123

R7

1

CR16-2002FM

20k 1/16W 1% Chip Resistor

Tad

(714) 255-9123

R8, R14

2

CR16-103JM

10k 1/16W 5% Chip Resistor

Tad

(714) 255-9123

R9

1

CR16-473JM

47k 1/16W 5% Chip Resistor

Tad

(800) 508-1521

R11

1

CR16-162JM

1.6k 1/16W 5% Chip Resistor

Tad

(800) 508-1521

R12

1

CR16-1582FM

15.8k 1/16W 1% Chip Resistor

Tad

(800) 508-1521

R13

1

CR16-4991FM

4.99k 1/16W 1% Chip Resistor

Tad

(800) 508-1521

R15

1

CR16-683JM

68k 1/16W 5% Chip Resistor

Tad

(800) 508-1521

R16

1

CR16-8871FM

8.87k 1/16W 1% Chip Resistor

Tad

(800) 508-1521

U1

1

LTC1702CGN

24-Lead SSOP IC

LTC

(408) 432-1900

PARTS LIST

Содержание LTC1702

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Отзывы: