DC469B - Demo Manual

QUICK START GUIDE FOR DEMO CIRCUITS 469A AND 469B
HIGH EFFICIENCY STEP-DOWN POWER SUPPLY
LTC3830 and LTC3832
DESCRIPTION
Demonstration circuits 469A and 469B are synchronous
step down power supplies providing up to 12A current
at programmable 2.5V, 1.8V or 1.5V. The input range is
3.1V to 8V. DC469A features the LTC3830 while DC469B
features the LTC3832. Both are voltage mode synchronous buck controllers. Both demo circuit boards provide
additional footprints for paralleling MOSFETs and input/output capacitors for higher current applications.
Also, the backside of each demo circuit board has a footprint for SO8 versions of the devices: the LTC3830-1 (on
the DC469A); and the LTC3832-1 (on the DC469B).
Before stuffing this portion of circuit, the related
LTC3830 or LTC3832 circuitry on the topside must be
removed. See the schematics for details.
Design files for this circuit board are available. Call
the LTC factory.
Table 1. Performance Summary
PARAMETER
CONDITION
VALUE
Minimum Input Voltage
3.1V
Maximum Input Voltage
8V
VOUT (2.5V)
JP1 is short (JP1 is short internally on the DC469B), JP2 and JP3 are open 2.5V ±0.05V
VOUT (1.8V)
JP2 is short, JP3 is open (on the DC469A, JP1 is open also)
1.8V ±0.05V
VOUT (1.5V)
JP3 is short, JP2 is open (on the DC469A, JP1 is open also)
1.5V ±0.05V
Maximum IOUT
Air flow 100LFM, VIN = 5V
12A
QUICK START PROCEDURE
Demonstration circuits 469A and 469B are easy to set
up to evaluate the performance of the LTC3830 and
LTC3832. Refer to Figure 1 for proper measurement
equipment setup and follow the procedure below:
NOTE: Default jumper settings: JP1 is short (DC469B:
JP1 is short internally), JP2 and JP3 are open
1. Connect the input 5V power source to VIN and GND
pins using wires capable of handling 8A current.
2. Turn on the 5V input power supply.
3. Measure VOUT. It should be 2.5V ±0.05V.
4. Increase load current to 12A. VOUT should be
2.5V ±0.05V.
5. Turn off the load.
6. Turn off the 5V input power. Short JP2 (DC469A:
open JP1 also).
7. Turn
on +5V input power. VOUT should be
1.8V ±0.05V
8. Turn off the 5V input power. Open JP2 and Short JP3.
9. Turn on 5V input power. VOUT should be 1.5V ±0.05V
1
QUICK START GUIDE FOR DEMO CIRCUITS 469A AND 469B
HIGH EFFICIENCY STEP-DOWN POWER SUPPLY
–
+
+
+
–
–
–
LOAD
+
–
+
–
+
Figure 1. Proper Measurement Equipment Setup
2
5
4
3
2
1
REVI SION HISTORY
LTC CONFIDENTIAL - For Customer Use Only
ECO
REV
0
DESCRIPTION
A
DATE
PRODUCTION RELEASE
12-19-01
APPROVED
>
VIN
D
D
VIN
TP1
PVcc2
R17
TP6
PVcc2
1
[1]
D3
PVcc1
MBR0520LT1
C10
10uF
16V
D5
C11
10uF
16V
C12
10uF
16V
3V-8V
C14
+ 220uF
10V
7343
TANT
2
0
D4
C13
10uF
16V
[1]
5 6 7 8
5 6 7 8
Q1
Q2
OPTION
D2
MMSZ5242B
C6
1uF
16V
14
C3
C1
2.2uF
10V
9
VCC
C8
0.1uF
16V
C9
[1]
1 2 3
1 2 3
2
PVcc1
U1
C
SS
IFB
G2
FREQSET
130K
RUN
G1
IMAX
0.01uF
R3
11
TP3
C7
0.1uF
16V
[1]
4
Vcc
15
R1
10
4
R4
12K
PVcc2
R15
1K
Si7892DP
8
PGND
GND
SHDN
C
1
G1
L1
12
R5
VOUT
13
16
SHEET 2
Vo
TP2
1K
5 6 7 8
Q3
5 6 7 8
1.3uH
Q4
OPTION
3
4
Si7892DP
4
4
D1
B320A
C15
+ [1]
OPT.
7343H
[1]
C16
+ 180uF
4V
7343H
C17
C18
+ [1] + [1]
OPT.
OPT.
7343H
7343H
2.5V/15A
C19
10uF
16V
COMP
R2
18.2K
LTC3830EGN
SENSE+
FB
7
6
1 2 3
1 2 3
R6
12.4K
1%
5
10
68pF
SENSE-
C4
C5
1500pF
C21
470pF
JP1
JP2
2.5V
B
R8
5.36K
1%
R9
2.32K
1%
JP3
1.8V
1.5V
B
[2]
C20
[1]
R7
12.7K
1%
TP4
TP7
G2
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL
PER ASME Y14.5M -1994
NOTES: UNLESS OTHERWISE SPECIFIED,
[1] DO NOT STUFF (OPTIONAL).
A
[2] FOR LTC3830-1ES8 - REPLACE CIRCUITRY IN DOTTED FRAME
THIRD ANGLE PROJECTION
(DO NOT STUFF) WITH CIRCUITRY ON SHEET 2.
CONTRACT NO.
APPROVALS
DRAWN
MEI
DATE
12-19-01
CHECKED
TECHNOLOGY
TITLE
A
APPROVED
STEP-DOWN POWER SUPPLY
SIZE CAGE CODE
DESIGNER
B
DO NOT SCALE DRAWING
4
3
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
SCH,LTC3830EGN HIGH EFFICIENCY
ENGINEER
5
SHEET 2
Tuesday, January 07, 2003
SCALE:NONE
2
DWG NO
REV
A
DC469A
FILENAME: 469A-2.DSN
SHEET
1
1
OF
2
5
4
3
2
1
REVISION HISTORY
LTC CONFIDENTIAL - For Customer Use Only
ECO
REV
<ECO#>
A
DESCRIPTION
DATE
PROTO
APPROVED
>
12-19-01
D
D
Vcc
PVcc2
PVcc1
C24
[2]
0.1uF
R16
1K
U2[2]
[2]
2
[2]
PVcc1
G1
Vcc/PVcc2
G2
SS
FB
1
G1
C25
7
2.2uF
10V
C28
4
C
0.1uF
6
COMP
GND
3
[2]
R12
16.5K
1%
68pF
1500pF
[2]
SHEET 1
Vo
5
C27
G2
[2]
C
[2]C26
8
SHEET 1
R14
LTC3830-1ES8
C22
[1]
15K
[2]
[2]
R13
16.9K
1%
C23
[1]
B
B
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCE ON ANGLE - - 2 PLACES - - 3 PLACES - - INTERPRET DIM AND TOL
PER ASME Y14.5M -1994
THIRD ANGLE PROJECTION
A
CONTRACT NO.
APPROVALS
DATE
DRAWN MEI
12-19-01
TECHNOLOGY
TITLE
CHECKED
APPROVED
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
SCH,LTC3830ES8 HIGH EFFICIENCY
STEP-DOWN POWER SUPPLY
A
ENGINEER
SIZE
DESIGNER
CAGE CODE
DWG NO
DO NOT SCALE DRAWING
5
4
Tuesday, January 07, 2003
3
SCALE:NONE
REV
A
DC469A
A
FILENAME: 469A-2.DSN
2
SHEET
2
OF
1
2
5
4
3
2
1
REVI SION HISTORY
LTC CONFIDENTIAL - For Customer Use Only
ECO
REV
0
DESCRIPTION
B
DATE
PRODUCTION RELEASE
12-19-01
APPROVED
>
VIN
D
D
VIN
TP1
PVcc2
R17
TP6
PVcc2
1
[1]
D3
PVcc1
MBR0520LT1
C10
10uF
16V
D5
C11
10uF
16V
C12
10uF
16V
3.1V-8V
C14
+ 220uF
10V
7343
TANT
2
0
D4
C13
10uF
16V
TP4
GND
[1]
5 6 7 8
5 6 7 8
Q1
Q2
OPTION
D2
MMSZ5242B
C6
1uF
16V
14
C3
C1
2.2uF
10V
9
VCC
C8
0.1uF
16V
C9
[1]
1 2 3
1 2 3
2
PVcc1
U1
C
SS
IFB
G2
FREQSET
130K
RUN
G1
IMAX
0.01uF
R3
11
TP3
C7
0.1uF
16V
[1]
4
Vcc
15
R1
10
4
R4
12K
PVcc2
R15
1K
Si7892DP
8
PGND
GND
SHDN
C
1
G1
L1
12
R5
VOUT
13
16
SHEET 2
Vo
TP2
1K
5 6 7 8
Q3
5 6 7 8
1.3uH
Q4
OPTION
3
4
Si7892DP
4
4
D1
B320A
C15
+ [1]
OPT.
7343H
[1]
C16
+ 180uF
4V
7343H
C17
C18
+ [1] + [1]
OPT.
OPT.
7343H
7343H
2.5V/1.8V/1.5V
C19
10uF
16V
@12A
COMP
R2
18.2K
SEE NOTE: [2]
LTC3832EGN
SENSE+
FB
7
6
1 2 3
1 2 3
R6
9.53K
1%
5
10
150pF
SENSE-
C4
C5
3300pF
C21
470pF
JP1
R8
16.5K
1%
JP2
R9
8.66K
1%
JP3
1.8V
B
C20
[1]
1.5V
R7
3.01K
1%
B
TP7
GND
G2
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL
PER ASME Y14.5M -1994
NOTES: UNLESS OTHERWISE SPECIFIED,
[1] C9,C15,C17,C18,C20,D4,D5,Q2,Q4 OPTIONAL - DO NOT STUFF.
A
[2] DC469B-A: COMPONENTS INSIDE DOTTED FRAME SHEET 1.
DC469B-B: COMPONENTS ON SHEET 2 INSTEAD.
THIRD ANGLE PROJECTION
CONTRACT NO.
APPROVALS
DRAWN
MEI
DATE
12-19-01
CHECKED
TECHNOLOGY
TITLE
A
STEP-DOWN POWER SUPPLY
ENGINEER
SIZE CAGE CODE
DESIGNER
B
DO NOT SCALE DRAWING
4
3
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
SCH,LTC3832EGN/-1ES8 HIGH EFFICIENCY
APPROVED
5
SHEET 2
Monday, January 06, 2003
SCALE:NONE
2
DWG NO
REV
B
DC469B
FILENAME: 469B-1.DSN
SHEET
1
1
OF
2
5
4
3
2
1
REVISION HISTORY
LTC CONFIDENTIAL - For Customer Use Only
ECO
REV
<ECO#>
B
DESCRIPTION
DATE
PROTO
APPROVED
>
12-19-01
D
D
Vcc
PVcc2
PVcc1
C24
[2]
0.1uF
R16
1K
U2[2]
[2]
2
PVcc1
G1
Vcc/PVcc2
G2
SS
FB
1
G1
C25
SHEET 1
[2]
7
2.2uF
10V
C28
G2
SHEET 1
Vo
[2]
5
C
[2]C26
8
4
C
0.1uF
6
COMP
GND
3
[2]
R12
9.53K
1%
150pF
C27
R14
3300pF
15K
[2]
[2]
LTC3832-1ES8
C22
[1]
[2]
R13
3.01K
1%
C23
[1]
B
B
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCE ON ANGLE - - 2 PLACES - - 3 PLACES - - INTERPRET DIM AND TOL
PER ASME Y14.5M -1994
THIRD ANGLE PROJECTION
A
CONTRACT NO.
APPROVALS
DATE
DRAWN MEI
12-19-01
TECHNOLOGY
TITLE
CHECKED
APPROVED
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
SCH,LTC3832EGN/-1ES8 HIGH EFFICIENCY
STEP-DOWN POWER SUPPLY
A
ENGINEER
SIZE
DESIGNER
CAGE CODE
DWG NO
DO NOT SCALE DRAWING
5
4
Monday, January 06, 2003
3
SCALE:NONE
REV
B
DC469B
A
FILENAME: 469B-1.DSN
2
SHEET
2
OF
1
2
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