Linear Technology DC2055A, Demo Manual, Page: 9 / 10

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dc2055afa
DEMO MANUAL DC2055A
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
5 5
4 4
3 3
2 2
1 1
D
D
C
C
B
B
A
A
VOUT2
IOUT2
IO2STEP_CLK
2512
1210
1210
REMOVE ZERO OHM JUMPERS FOR DUAL-OUTPUT OPERATION
OPTIONAL 5mm x 6mm Dual-MOSFETs
OPTIONAL 5.5V BIAS
ON
OFF
BIAS
VOUT1
LOAD STEP CIRCUIT 1
IOUT1
IO1STEP_CLK
2512
1210
1210
FDMS3620S
FDMS3620S
FDMS3620S
FDMS3620S
LOAD STEP CIRCUIT 2
FDMS3620S
FDMS3620S
FDMS3620S
FDMS3620S
BUCK CONVERTER WITH VERY LOW DCR INDUCTOR
HZ
VIN
VIN
EXTVCC
+5.5V
VIN
VIN
VIN
TG2 BG2
SW2
VFB1
VFB2
VO1_SNS-
VO2_SNS-
ITH1
ITH2
TK/SS1
TK/SS2
RUN1
RUN2
TG1 BG1
SW1
VOUT1
VIN
VOUT2
TG4 BG4
SW4
TG3 BG3
SW3
VOUT1
VOUT2
TAVG1
TAVG2
SIZE DATE:
IC NO.
REV.
SHEET
OF
TITLE:
APPROVALS
PCB DES. APP ENG.
TECHNOLOGY
Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Tuesday, November 19, 2013
33
HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS
HAORAN W.
B
LTC3875EUJ
DEMO CIRCUIT 2055A
SIZE DATE:
IC NO.
REV.
SHEET
OF
TITLE:
APPROVALS
PCB DES. APP ENG.
TECHNOLOGY
Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Tuesday, November 19, 2013
33
HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS
HAORAN W.
B
LTC3875EUJ
DEMO CIRCUIT 2055A
SIZE DATE:
IC NO.
REV.
SHEET
OF
TITLE:
APPROVALS
PCB DES. APP ENG.
TECHNOLOGY
Fax: (408)434-0507 Milpitas, CA 95035 Phone: (408)432-1900 1630 McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Tuesday, November 19, 2013
33
HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS
HAORAN W.
B
LTC3875EUJ
DEMO CIRCUIT 2055A
Q11
OPT
Q11
OPT
4
2
3
1
5
6
7
8
9
C29 100uF 6.3V C29 100uF 6.3V
Q18 OPT Q18 OPT
4
2
3
1
5
6
7
8
9
R50 34.8K 1% R50 34.8K 1%
Q6 OPT Q6 OPT
4
2
3
1
5
6
7
8
9
R46
0
R46
0
R67
0
R67
0
Q10 OPT Q10 OPT
4
2
3
1
5
6
7
8
9
+
COUT11 330uF
7343
+
COUT11 330uF
7343
J9J9
1
2
3
4
5
R53
0
R53
0
C31 0.22uF C31 0.22uF
CIN7 OPT CIN7 OPT
J7J7
1
2
3
4
5
C35 0.22uFC350.22uF
C27 10uF 16V C27 10uF 16V
CIN9 OPT CIN9 OPT
+
COUT9 330uF
7343
+
COUT9 330uF
7343
CIN6 OPT CIN6 OPT
C32 0.22uFC320.22uF
+
COUT12 330uF
7343
+
COUT12 330uF
7343
CIN8 OPT CIN8 OPT
J10J10
1
2
3
4
5
R54
0
R54
0
CIN11 OPT CIN11 OPT
E19
GND
E19
GND
U2
LT1763CDE
U2
LT1763CDE
NC
1
NC
4
OUT
3
OUT
2
ADJ
5
BYP
6
GND
7
SHDN
8
NC
9
IN
10
IN
11
NC
12
GND
13
C28 10uF 16V C28 10uF 16V
+
COUT10 330uF
7343
+
COUT10 330uF
7343
Q8
RJK0305DPB
Q8
RJK0305DPB
1
2
5
3
4
R61
0
R61
0
J8J8
1
2
3
4
5
R58 0.005 R58 0.005
R72
0
R72
0
CIN12 OPT CIN12 OPT
C36 0.22uFC360.22uF
R56 0.005 R56 0.005
C34 100uF 6.3V C34 100uF 6.3V
Q12 OPT Q12 OPT
4
2
3
1
5
6
7
8
9
Q9
OPT
Q9
OPT
4
2
3
1
5
6
7
8
9
E17
GND
E17
GND
CIN17 OPT CIN17 OPT
E16E16
Q17
OPT
Q17
OPT
4
2
3
1
5
6
7
8
9
E18E18
R48
0
R48
0
R52 10K R52 10K
C30 100uF 6.3V C30 100uF 6.3V
R49 10K R49 10K
Q7
RJK0305DPB
Q7
RJK0305DPB
1
2
5
3
4
Q5
OPT
Q5
OPT
4
2
3
1
5
6
7
8
9
JP5JP5
1
2
3
CIN10 OPT CIN10 OPT
R66
0
R66
0
R57 10K R57 10K
C33 100uF 6.3V C33 100uF 6.3V
R59
0
R59
0
R47 OPT R47 OPT
R55 10K R55 10K
R51
0
R51
0
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