Linear Technology LTC1628 Manual Download Page 12

12

DEMO MANUAL DC236

DESIGN-READY SWITCHERS

dc236fa LT/TP 0200 1K REV A • PRINTED IN USA

 

LINEAR TECHNOLOGY CORPORATION 1998

Linear Technology  Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 

 FAX: (408) 434-0507 

 ● 

 www.linear-tech.com

A

A

D

D

C

E

E

E

E

E

E

E

E

E

E

E

E

2000.0

3000.0

200.0

200.0

C

A

A

B

F

F

F

F

F

F

F

F

F
F

F

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

F

B

B

B

B

B

HOLE CHART

NUMBER

SYMBOL

DIAMETER

OF HOLES

PLATED

A

120

4

YES

B

94

6

YES

C

70

2

NO

D

64

2

YES

E

30

24

YES

F

15

36

YES

G

10

33

YES

TOTAL

107

NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL DIMENSIONS ARE IN MILS, 

±

3

2. FINISHED HOLE SIZES ARE 

±

3

3. FINISHED MATERIAL IS FR4, 62-THICK, 2 OZ Cu, 4-LAYERS
4. PLATED HOLE WALL THICKNESS IS 1MIL MINIMUM
5. INTERNAL LAYERS ARE 1 OZ Cu

PC FAB DRAWI  G

U

Summary of Contents for LTC1628

Page 1: ...f operation are available Burst ModeTM operation offers highest efficiency while Burst Disable modeprovidesconstant frequencyoperationdownto1 of maximum designed load The frequency is externally DC co...

Page 2: ...MOSFETs may be dam aged The recommended VIN to start is 7V 5 Switch on the desired channel s by removing the RUN SS1 or RUN SS2 jumper 6 Measure VOUT1 and VOUT2 to verify output voltages of 5V 0 1V a...

Page 3: ...9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 U1 LTC1628 C7 1000pF C13 180pF R11 10 L2 10 H L1 10 H R2 0 015 R1 0 015 C5 0 1 F R3 105k 1 R5 20k 1 R9 1M R12 1M R10 1M TP1 3 3V LDO TP2 5V...

Page 4: ...43 946 0362 C7 C8 C11 C12 4 06033A102JAT1A 1000pF 25V 5 NPO Capacitor AVX 843 946 0362 C9 C10 2 06035A330JAT1A 33pF 50V 5 NPO Capacitor AVX 843 946 0362 C13 C14 2 06035C181JAT1A 180pF 50V 5 NPO Capaci...

Page 5: ...nificant reduc tion in total RMS input current which in turn allows less expensive input capacitors to be used reduces shielding requirements for EMI and improves real world operating efficiency Figur...

Page 6: ...proprietary technique to allow 2 phase operation In addition isolation between the two channels becomes more critical with 2 phase operation because switch transitions in one channel could poten tiall...

Page 7: ...daryvoltageabovethe0 8V hysteresis level The FLTCPL pin allows coupling between the two con trollers in several situations The controllers will act independently when FLTCPL is grounded When the pin i...

Page 8: ...omponents that may not be necessary depending upon the particular design include C9 C10 C13 C14 C18 and R11 Certain components may be larger than specific applications will require Theoutputcapacitanc...

Page 9: ...on is worsened by a factor of the turns ratio for any secondary flyback winding Keep these switch node related PC traces small and away from the quiet side of theIC notjustaboveandbeloweachotherontheo...

Page 10: ...ins of the IC Peak currents exceed 1A when charging the gates of the bottom MOSFETs Component Side Silkscreen Copper Layer 1 Top The traces that sense the voltage across the current sensingresistorcan...

Page 11: ...te and reliable However no responsibility is assumed for its use Linear Technology Corporation makes no represen tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpate...

Page 12: ...E 2000 0 3000 0 200 0 200 0 C A A B F F F F F F F F F F F G G G G G G G G G G G G G G G F B B B B B HOLE CHART NUMBER SYMBOL DIAMETER OF HOLES PLATED A 120 4 YES B 94 6 YES C 70 2 NO D 64 2 YES E 30 2...

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