Linear Technology LTC1628 Скачать руководство пользователя страница 3

3

DEMO MANUAL DC236

DESIGN-READY SWITCHERS

1

2

3

4

5

6

7

8

9

10

11

12

13

14

TOP VIEW

G PACKAGE

28-LEAD PLASTIC SSOP

28

27

26

25

24

23

22

21

20

19

18

17

16

15

RUN/SS1

SENSE1

+

SENSE1

V

OSENSE1

FREQSET

STBYMD

FCB

I

TH1

SGND

3.3V

OUT

I

TH2

V

OSENSE2

SENSE2

SENSE2

+

FLTCPL

TG1

SW1

BOOST1

V

IN

BG1

EXTV

CC

INTV

CC

PGND

BG2

BOOST2

SW2

TG2

RUN/SS2

LTC1628CG

+

+

+

+

RUN/SS1

SENSE

+

SENSE1

V

OSENSE1

FREQSET

STBYMD

FCB

I

TH1

SGND

3.3V

OUT

I

TH2

V

OSENSE2

SENSE2

SENSE2

+

FLTCPL

TG1

SW1

BOOST1

V

IN

BG1

EXTV

CC

INTV

CC

PGND

BG2

BOOST2

SW2

TG2

RUN/SS2

1

2

3

4

5

6

7

8

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

µ

H

L1,10

µ

H

R2,0.015

R1,0.015

C5,0.1

µ

F

R3,105k,1%

R5

20k,1%

R9

1M

R12

1M

R10

1M

TP1

3.3V

LDO

TP2

5V

R4,63.4k,1%

R6,20k,1%

R8,15k

R7,15k

C11
1000pF

C3
0.1

µ

F

C18
0.1

µ

F

D1
MBRM
140T3

V

IN

5V TO
30V

V

OUT2

3.3V
4A PK

DC236 F02

V

OUT1

5V
4A PK

D2
MBRM
140T3

C17

22

µ

F

50V

C1,150

µ

F,6V

C2,180

µ

F,4V

SP CAP

GND

SP CAP

C16
4.7

µ

F

M1a

M1b

M2b

M2a

C4

0.1

µ

F

C15
1

µ

F

D4

D3

C12
1000pF

C10
33pF

C9
33pF

C19

C21

C20

C8,1000pF

C14,180pF

C6,0.1

µ

F

0.01

µ

×

 3

SWITCHING FREQUENCY = 300kHz
D3, D4 = CMDSH-3TR
M1, M2 = FDS8936A
L1, L2 = PANASONIC N6 SERIES 10.1

µ

H

Figure 2. LTC1628 Fixed 5V/4A, 3.3V/4A, High Efficiency Dual Regulator

PACKAGE A  D SCHE   ATIC DIAGRA   S

U

W

W

Содержание LTC1628

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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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