Linear Technology DC1185B-A, DC1185B-B, LTC3850EUF Demo Manual

Page 1
DESCRIPTION
DEMO MANUAL
DC1185B-A/-B
LTC3850EUF
Dual Phase/Dual Output
Synchronous Buck Converter
The demo board uses a high density, 2-sided drop-in layout. The power components excluding the bulk output and input capacitors, fit within a 1.35" × 0.75" area on the top layer. The control circuit resides in a 0.60" × 0.75" area on the bottom layer. The package style for the LTC3850EUF is a 4mm × 4mm 28-lead QFN with an exposed ground pad.
PERFORMANCE SUMMARY
PARAMETER CONDITION VALUE
Minimum Input Voltage 6.5V
Maximum Input Voltage 14V
Specifications are at TA = 25°C
The main features of the board include an internal 5V linear regulator for bias, RUN pins for each output, an EXTVCC
-
pin and a PGOOD signal. The board can be configured for either CCM (original setting), Burst Mode skipping operation with the MODE jumper. The board also has optional resistors for single output/dual phase operation, rail tracking, DCR sensing and synchronization to an external clock.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Note: Q1-Q4 MOSFETs changed on September 10, 2013. See Schematic Diagram.
®
, or pulse-
Version DC1185B-A
Output Voltage V
Output Voltage V
Nominal Switching Frequency 500kHz
Full-Load Efficiency (See Figure 3 for Efficiency Curves)
Version DC1185B-B
Output Voltage V
Output Voltage V
Nominal Switching Frequency 400kHz
Full-Load Efficiency (See Figure 4 for Efficiency Curves)
OUT1
OUT2
OUT1
OUT2
I
= 0A to 10A 2.0V ±2%
OUT1
I
= 0A to 10A 1.8V ±2%
OUT2
= 2.0V, I
V
OUT1
V
= 1.8V, I
OUT2
I
= 0A to 15A 1.5V ±2%
OUT1
I
= 0A to 15A 1.2V ±2%
OUT2
= 1.5V, I
V
OUT1
V
= 1.2V, I
OUT2
= 10A, VIN = 12V
OUT1
= 10A, VIN = 12V
OUT2
= 15A, VIN = 12V
OUT1
= 15A, VIN = 12V
OUT2
90.2%
89.5%
88.1%
86.5%
dc1185b-a/-bf
1
Page 2
DEMO MANUAL DC1185B-A/-B
QUICK START PROCEDURE
Demonstration circuit 1185 is easy to set up to evaluate the performance of the LTC3850EUF. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below:
Note: When measuring the output or input voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. See Figure 2 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead.
Place jumpers in the following positions:
JP1 RUN1 ON
JP2 RUN2 ON
JP3 MODE CCM
With power off, connect the input power supply to VIN and GND.
Turn on the power at the input.
Note: Make sure that the input voltage does not exceed 15V.
Check for the proper output voltages.
Version DC1158B-A:
V
V
Version DC1158B-B:
V
V
Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters.
Note: turrets. These turrets are only intended to Kelvin sense the output voltage across COUT1 and COUT4. Heavy load currents may damage the output voltage sense traces.
= 1.960V to 2.040V
OUT1
= 1.764V to 1.836V
OUT2
= 1.470V to 1.530V
OUT1
= 1.176V to 1.224V
OUT2
Do not apply load across the VOSn+ and VOSn
2
Figure 1. Proper Measurement Equipment Setup
dc1185b-a/-bf
Page 3
DEMO MANUAL
VOUT
GND
COUT
+
-
DC1185B-A/-B
QUICK START PROCEDURE
Figure 2. Measuring Output Voltage Ripple
2.0V/10A and 1.8V/10A Efficiency at VIN = 12V and fSW = 500kHz 1.5V/15A and 1.2V/15A Efficiency at VIN = 12V and fSW = 400kHz
95
90
85
80
EFFICIENCY (%)
QTOP: RJK030DPB QBOTTOM: RJK0330DPB
75
L: TOKO FDU0650-R56M = P3
0.56µH, DCR = 2.45mΩ, 3.2mΩ MAX R
70
0
= 3mΩ
SENSE
4 6 8
2
LOAD CURRENT (A)
2.0V
1.8V
10 12
Figure 3. Efficiency Curves for the DC1185B-A Figure 4. Efficiency Curves for the DC1185B-B
SINGLE OUTPUT/DUAL PHASE OPERATION
A single output/dual phase converter may be preferred for high output current applications. The benefits of single output/dual phase operation is lower ripple current through the input and output capacitors, improved load step response and simplified thermal design. To implement single output/dual phase operation, make the following modifications:
1. Tie VOUT1 to VOUT2 by tying together the exposed copper pads near J3 and J5 at the edge of the board. Use a piece of heavy copper foil.
2. Tie ITH1 to ITH2 by stuffing 0Ω at R49.
3. Tie VFB1 to VFB2 by stuffing 0Ω at R50.
4. Tie TRK/SS1 to TRK/SS2 by stuffing 0Ω at R52.
5. Tie RUN1 to RUN2 by stuffing 0Ω at R55.
6. Remove the redundant ITH compensation network and VFB divider.
95
90
85
80
EFFICIENCY (%)
75
70
0
QTOP: RJK030DPB QBOTTOM: RJK0330DPB L: VITEC 59PR9875
0.4µH, DCR = 0.47mΩ ±10% = 2mΩ
R
SENSE
6 9 12
3
LOAD CURRENT (A)
1.5V
1.2V
15 18
dc1185b-a/-bf
3
Page 4
DEMO MANUAL DC1185B-A/-B
RAIL TRACKING
Demonstration circuit 1185 is set up for independent turn-on of VOUT1 and VOUT2. The ramp-rate for VOUT1 is determined by the TRK/SS1 capacitor at C2 and the ramp­rate for VOUT2 is determined by the TRK/SS2 capacitor at C47. The turn-on of one rail will not affect the other for the original demo board.
Table 1. VOUT1 Tracking Options for a 1.5V Output
TRACK 1 DIVIDER TRK/SS1 CAPACITOR
CONFIGURATION R3 R2 C2
Soft-Start without Tracking (Original Board) Not Stuffed 0.1µF
External Coincident Tracking 17.8kΩ 20.0kΩ Not Stuffed
Table 2. VOUT2 Tracking Options for a 1.2V Output
CONFIGURATION R36 R34 R37 C47
Soft-Start without Tracking (Original Board) Not Stuffed Not Stuffed 0.1µF
Coincident Tracking to VOUT1 (1.5V) 10.0kΩ 20.0kΩ Not Stuffed
External Coincident Tracking 10.0kΩ Not Stuffed 20.0kΩ Not Stuffed
This board can be modified on the bench to allow VOUT1 to track an external signal. It can also be modified to allow VOUT an
external signal. Tables 2 and 3 cover the rail tracking
2 to track VOUT1 or to allow VOUT2 to track
options for each rail, with the DC3850B-B version used as an example.
TRACK 2 DIVIDER TRK/SS2 CAPACITOR
4
dc1185b-a/-bf
Page 5
INDUCTOR DCR SENSING
DEMO MANUAL
DC1185B-A/-B
Demonstration circuit 1185 provides an optional circuit for DCR sensing. DCR sensing uses the DCR of the in­ductor to sense
sense the inductor current instead of discrete
resistors. The advantages of DCR sensing are lower cost, reduced board space and higher efficiency, but the disadvantage is a less accurate current limit. If DCR sens
­ing is used, be sure to select an inductor current with a sufficiently
high saturation current or use an iron powder
type. Tables 3 and 4 show an example of how to modify
= 2.0V/10A
V
OUT1
= 1.8V/10A
V
OUT2
= 6.5V to 14V
V
IN
= 500kHz, typical
f
SW
L1, L2 = Toko FDU0650-R56M=P3 (0.56µH, DCR = 2.45mΩ Typ, 3.2
mΩ Max)
ILIM = Floating (R42, R44 = Open)
the DC1185 for DCR sensing using these parameters:
Table 3. V
CONFIGURATION RS1 L1 R29, R30 C14 R45 R47 R61
DCR Sensing Short with Cu
Discrete R (Original Board)
Configured as a 2.0V/10A Converter Using DCR Sensing and Discrete Sense Resistors
OUT1
DCR FILTER/DIVIDER RESISTORS
2.37kΩ 6.49kΩ
SENSE
Strip or Very Short and Thick Piece of Wire
3mΩ 2010 Package
Toko FDU0650-R56M=P3
Toko FDU0650-R56M=P3
R
FILTER
SENSE
RESISTORS
Open 0.1µF
100Ω 1nF Open Open Open
SENSE FIILTER
CAPACITOR
SENSE1– TO L1–
JUMPERTOP BOTTOM
Table 4. V
CONFIGURATION RS2 L2 R39, R40 C15 R51 R53 R62
DCR Sensing Short with Cu
Discrete R (Original Board)
Configured as a 1.8V/10A Converter Using DCR Sensing and Discrete Sense Resistors
OUT2
DCR FILTER/DIVIDER RESISTORS
2.37kΩ 6.49kΩ
SENSE
Strip or Very Short and Thick Piece of Wire
3mΩ 2010 Package
Toko FDU0650-R56M=P3
Toko FDU0650-R56M=P3
R
FILTER
SENSE
RESISTORS
Open 0.1µF
100Ω 1nF Open Open Open
SENSE FIILTER
CAPACITOR
SENSE1– TO L1–
JUMPERTOP BOTTOM
dc1185b-a/-bf
5
Page 6
DEMO MANUAL DC1185B-A/-B
SYNCHRONIZATION TO AN EXTERNAL CLOCK
The LTC3850 uses a phase-lock-loop which forces its internal clock to be synchronized to an external clock. Once synchronized, the rising edge of the top FET gate is aligned to the rising edge of the external clock. The external clock signal needs to be applied to the LTC3850’s MODE pin which is tied to the turret labeled SYNC. The internal phase lock loop is stabilized by a network on the FREQ pin of the LTC3850. To set up the DC1185 for synchronization to an external clock, follow the steps below.
1. Remove R7.
2. Stuff 10kΩ at R8.
3. Stuff 10nF at R10.
4. Leave 1nF at C12.
5. Float the MODE pin by placing the MODE jumper in the BM position.
6. Apply the external clock from the turret la-beled SYNC to GND.
6
dc1185b-a/-bf
Page 7
DEMO MANUAL
DC1185B-A/-B
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C11, C32, C36 CAP, 0805 4.7µF 10% 6.3V X5R AVX 08056D475K AT
2 5 C12, C14, C15, C41, C44 CAP, 0603 1nF 10% 50V X7R AVX 06035C102KAT
3 5 C2, C17, C20, C21, C47 CAP, 0603 0.1µF 10% 25V X7R TDK C1608X7R1E104K
4 2 C43, C42 CAP, 0603 100pF 5% 25V X7R AVX 06033C101J AT
5 1 CIN1 CAP, 180µF 20% 16V OSCON SANYO OSCON 16SVP180MX
6 2 CIN2, CIN3 CAP, 1210 10µF 10% 16V X5R TAIYO YUDEN EMK325BJ106KN-T
7 2 COUT1, COUT4 CAP, 1210 47µF 20% 6.3V X5R TDK C3225X5R0J476MT
8 4 COUT2, COUT3, COUT5, COUT6 CAP, 7343 330µF 20% 2.5V POSCAP SANYO 2R5TPE330M9
9 2 D2, D1 DIODE, CMDSH-3 SOD323 CENTRAL CMDSH-3TR
10 2 L1, L2 IND, 0.56µH TOKO FDU0650-R56M=P3
11 2 Q1, Q3 XSTR, N-CHANNEL MOSFET RENESAS RJK0305DPB
12 2 Q2, Q4 XSTR, N-CHANNEL MOSFET RENESAS RJK0330DPB
13 1 R10 RES, 0603 3.16k 1% 1/10W VISHAY CRCW06033K16FKEA
14 1 R18 RES, 0603 2.2Ω 5% 1/10W VISHAY CRCW06032R20JNEA
15 1 R27 RES, 0603 30.1k 1% 1/10W VISHAY CRCW060330K1FKEA
16 4 R29, R30, R39, R40 RES, 0603 100Ω 5% 1/10W VISHAY CRCW0603100RJNEA
17 2 R31,R35 RES, 0603 8.66k 1% 1/10W VISHAY CRCW06038K66FKEA
18 2 R32,R33 RES, 0603 20k 1% 1/10W VISHAY CRCW060320KFKEA
19 1 R43 RES, 0603 25.5k 1% 1/10W VISHAY CRCW060325K5FKEA
20
21 2 R7, R4 RES, 0603 10k 1% 1/16W VISHAY CRCW060310K0FKEB
22 3 R8, R9, R25 RES, 0603 0Ω JUMPER PANASONIC ERJ3GEY0R00V
23 2 RS2, RS1 RES, 2010 0.003Ω 5% 1/2W VISHAY WSL20103L000FEA
24 1 U1 IC, LTC3850EUF LINEAR TECH. LTC3850EUF
Additional Circuit Components
1 0 CIN5, CIN4 CAP, 1210 OPTION OPTION
2 0 C1, C37, C38, C47, C48, C49 CAP, 0603 OPTION OPTION
3 1 C50 CAP, 0603 1µF 20% 16V X7R AVX 0603YC105M AT2A
4 0 D4, D3 DIODE, SCHOTTKY 40V 3A OPTION OPTION
5 0 Q5, Q6, Q7, Q8 DO NOT STUFF OPTION
6 3 R1, R3, R36 RES, 0603 0Ω JUMPER PANASONIC ERJ3GEY0R00V
7 0 R2, R26, R28, R34, R37, R38, R41, R42,
Hardware
1 12 E1-E6, E9-E14 TURRET MILL-MAX 2501-2-00-80-00-00-07-0
2 2 JP2, JP1 HEADER, 3-PIN, 2mm SAMTEC TMM-103-02-L-S
3 1 JP3 HEADER, 4-PIN SAMTEC TMM-104-02-L-S
4 6 J1, J2, J3, J4, J5, J6 JACK, BANANA KEYSTONE 575-4
5 3 JP1-JP3 SHUNT, 2mm SAMTEC 2SN-BK-G
1 R46 RES, 0603 100k 5% 1/10W VISHA
(DC1185B-A)
Y CRCW0603100KJNEB
RES, 0603 OPTION OPTION R44, R45, R47, R49, R50-R53, R55, R60-R62
dc1185b-a/-bf
7
Page 8
DEMO MANUAL DC1185B-A/-B
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C11, C32, C36 CAP, 0805 4.7µF 10% 6.3V X5R AVX 08056D475K AT
2 5 C12, C14, C15, C41, C44 CAP, 0603 1nF 10% 50V X7R AVX 06035C102K AT
3 5 C2, C17, C20, C21, C47 CAP, 0603 0.1µF 10% 25V X7R TDK C1608X7R1E104K
4 2 C43, C42 CAP, 0603 100pF 5% 25V X7R AVX 06033C101JAT
5 1 CIN1 CAP, 180µF 20% 16V OSCON SANYO OSCON 16SVP180MX
6 2 CIN2, CIN3 CAP, 1210 10µF 10% 16V X5R TAIYO YUDEN EMK325BJ106KN-T
7 2 COUT1, COUT4 CAP, 1210 100µF 20% 6.3V X5R TDK C3225X5R0J107MT
8 4 COUT2, COUT3, COUT5, COUT6 CAP, 7343 330µF 20% 2.5V POSCAP SANYO 2R5TPE330M9
9 2 D2, D1 DIODE, CMDSH-3 SOD323 CENTRAL CMDSH-3TR
10 2 L1, L2 IND, 0.4µH VITEC 59PR9875
11 2 Q1, Q3 XSTR, N-CHANNEL MOSFET RENESAS RJK0305DPB
12 2 Q2, Q4 XSTR, N-CHANNEL MOSFET RENESAS RJK0330DPB
13 1 R10 RES, 0603 2.55k 1% 1/10W VISHAY CRCW06032K55FKEB
14 1 R18 RES, 0603 2.2Ω 5% 1/10W VISHAY CRCW06032R20JNEA
15 1 R27 RES, 0603 17.8k 1% 1/10W VISHAY CRCW060317K8FKEA
16 4 R29, R30, R39, R40 RES, 0603 100Ω 5% 1/10W VISHAY CRCW0603100RJNEA
17 2 R31, R35 RES, 0603 5.9k 1% 1/10W VISHAY CRCW06035K90FKEA
18 2 R32, R33 RES, 0603 20k 1% 1/10W VISHAY CRCW060320KFKEA
19 1 R43 RES, 0603 10.0k 1% 1/10W VISHAY CRCW060310K0FKEB
20 1 R46 RES, 0603 100k
21
22 3 R8, R9, R25 RES, 0603 0Ω JUMPER PANASONIC ERJ3GEY0R00V
23 2 RS2, RS1 RES, 2010 0.002Ω 5% 1/2W VISHAY WSL20102L000FEA
24 1 U1 IC, LTC3850EUF LINEAR TECH. LTC3850EUF
Additional Circuit Components
1 0 CIN5, CIN4 CAP, 1210 OPTION OPTION
2 0 C1, C37, C38, C47, C48, C49 CAP, 0603 OPTION OPTION
3 1 C50 CAP, 0603 1µF 20% 16V X7R AVX 0603YC105MAT2A
4 0 D4, D3 DIODE, SCHOTTKY 40V 3A OPTION OPTION
5 0 Q5, Q6, Q7, Q8 DO NOT STUFF OPTION
6 3 R1, R3, R36 RES, 0603 0Ω JUMPER PANASONIC ERJ3GEY0R00V
7 0 R2, R26, R28, R34, R37, R38, R41,
Hardware
1 12 E1-E6, E9-E14 TURRET MILL-MAX 2501-2-00-80-00-00-07-0
2 2 JP2, JP1 HEADER, 3-PIN, 2mm SAMTEC TMM-103-02-L-S
3 1 JP3 HEADER, 4-PIN SAMTEC TMM-104-02-L-S
4 6 J1, J2, J3, J4, J5, J6 JACK, BANANA KEYSTONE 575-4
5 3 JP1-JP3 SHUNT, 2mm SAMTEC 2SN-BK-G
2 R7, R4 RES, 0603 10k 1% 1/16W VISHAY CRCW060310K0FKEB
(DC1185B-B)
5% 1/10W VISHAY CRCW0603100KJNEB
RES, 0603 OPTION OPTION R42, R44, R45, R47, R49, R50-R53, R55, R60-R62
8
dc1185b-a/-bf
Page 9
SCHEMATIC DIAGRAM
1
2
3
4
5
6
7
8
A
B
C
D
11
11
11
DEMO MANUAL
DC1185B-A/-B
A
MIKE S.
REVISION HISTORY
REVISION HISTORY
REVISION HISTORY
PROD1 12/12/07
PROD1 12/12/07
PROD1 12/12/07
DESCRIPTION DATE APPROVEDECO REV
DESCRIPTION DATE APPROVEDECO REV
DESCRIPTION DATE APPROVEDECO REV
CHANGE: Q1,Q2,Q3,Q4 08/04/13 MIKE S.
1.1
VIN
VIN+
J1J1
E5E5
VIN
6.5V - 14V
+
12
CIN1
180uF
180uF
VIN-
GND
J2J2
E6E6
16V+CIN1
16V
VIN
E11E11
VL1-
CIN4
OPT
CIN4
OPT
CIN2
10uF
CIN2
10uF
Q5
OPTQ5OPT
783 6 5
4
783 6 5
4
Q1
[1]Q1[1]
<
VO1+
L1 [1]L1 [1]
2 1
2 1
J3J3
VOUT1
RS1
RS1
VSW1
VOUT1
[1]
C32
C32
COUT1
COUT1
[1]
[1]
783 6 5
Q6
783 6 5
Q2
4.7uF
4.7uF
COUT3
+
COUT2
+
{1}
{1}
OPTQ6OPT
[1]Q2[1]
2010
6.3V
6.3V
330uF
330uF
330uF
330uF
D4
B
VO1-
GND
J4J4
E12E12
2.5V+COUT3
2.5V
2.5V+COUT2
2.5V
2 1
OPTD4OPT
4
4
VIN
2 1
2 1
INTVCC
VO2+
E13E13
VL2-
CIN5
OPT
CIN5
OPT
L2 [1]L2 [1]
CIN3
10uF
CIN3
10uF
Q7
OPTQ7OPT
783 6
2
5
1
4
783 6
2
5
1
4
Q3
[1]Q3[1]
J5J5
RS2
RS2
VOUT2
VOUT2
COUT6
COUT5
[1]
[1]
VSW2
Q8
Q4
[1]
C36
4.7uF
C36
4.7uF
330uF
2.5V+COUT6
330uF
2.5V
+
330uF
2.5V+COUT5
330uF
2.5V
+
COUT4
{1}
COUT4
{1}
2010
D3
783 6 5
OPTQ8OPT
783 6 5
[1]Q4[1]
C
X2X2
X1X1
VO2-
GND
J6J6
E14E14
6.3V
6.3V
2 1
OPTD3OPT
2 1
4
2 1
4
1
1
Represents
VL1-
R61
R61
S1-
R47
OPT
R47
OPT
R45
R45
OPT
OPT
VSW1 S1+
IMPLEMENTED, SHORT RSENSE1 & RSENSE2.
NOTE:
WHEN DCR SENSING IS
ITH2
R49
R49
R50
R50
OPT
OPT
OPERATION OPTIONAL DCR SENSING
ITH1
VFB1 VFB2
OPTIONAL JUMPERS FOR
SINGLE OUTPUT/DUAL PHASE
on PCB
Tooling Holes
OPT
OPT
R51
R51
VSW2 S2+
REMOVE R30, R29, R40 & R39
CALCULATE R45, R47, C14 AND
R51, R53 & C15 PER THE DATA
STUFF R61 AND R62 WITH 0 OHMS.
TRK/SS2TRK/SS1
R52
R52
OPT
OPT
D
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
VL2-
R62 OPTR62 OPT
TECHNOLOGY
TECHNOLOGY
TECHNOLOGY
S2-
R53
OPT
R53
OPT
OPT
OPT
DATE
DATE
DATE
APPROVALS
APPROVALS
APPROVALS
CONTRACT NO.
CONTRACT NO.
CONTRACT NO.
SHEET. ALSO REFER TO QSG
FOR EXAMPLE.
RUN2RUN1
R55
R55
OPT
OPT
OPT
OPT
1
1
1
REV
REV
REV
OF
OF
OF
8
SHEET
SHEET
SHEET
DC1185B
DC1185B
DC1185B
DWG NO
DWG NO
DWG NO
1185B-1.DSNNONE
1185B-1.DSNNONE
1185B-1.DSNNONE
FILENAME:
FILENAME:
FILENAME:
BUCK CONVERTER
BUCK CONVERTER
BUCK CONVERTER
7
CAGE CODE
CAGE CODE
CAGE CODE
SCH, LTC3850EUF, DUAL OUTPUT SYNCHRONOUS
SCH, LTC3850EUF, DUAL OUTPUT SYNCHRONOUS
SCH, LTC3850EUF, DUAL OUTPUT SYNCHRONOUS
SIZE
SIZE
SIZE
SCALE:
SCALE:
MIKE S. 08/05/13
CHECKED
APPROVED
ENGINEER
DESIGNER
CHECKED
APPROVED
ENGINEER
DESIGNER
CHECKED
APPROVED
ENGINEER
DESIGNER
47uF
COUT1/COUT4
R10
3.16K
SCALE:
Tuesday, September 10, 2013
Tuesday, September 10, 2013
Tuesday, September 10, 2013
6
100uF
5
2.55K
FSW
TITLE
TITLE
TITLE
10/31/06
10/31/06
10/31/06
MEI
MEI
MEI
DRAWN
DRAWN
DRAWN
SET RSENSE FILTER TIME CONSTANT0.6nH/RSENSE FOR 2010 PACKAGE.
NOTE:
4
JP3
JP3
CCMBM
3
2
MODE
MODE
PS
1
R4
10.0KR410.0K
INTVCC
INTVCCVIN
C1
OPTC1OPT
R10R1
Linear Technology has made a best effort to
Linear Technology has made a best effort to
Linear Technology has made a best effort to
0
E1E1
R27
[1]
R27
[1]
C37
OPT
C37
OPT
R7
10.0KR710.0K
R26
OPT
R26
OPT
1
2
RUN1
ON
SYNC
and reliable operation in the actual application, Component
Applications Engineering for assistance.
and reliable operation in the actual application, Component
Applications Engineering for assistance.
and reliable operation in the actual application, Component
Applications Engineering for assistance.
Customer Notice:
Customer Notice:
Customer Notice:
design a circuit that meets customer-supplied specifications;
however, it remains the customer's responsibility to verify proper
substitution and printed circuit board layout may significantly
affect circuit performance or reliability. Contact Linear
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
design a circuit that meets customer-supplied specifications;
however, it remains the customer's responsibility to verify proper
substitution and printed circuit board layout may significantly
affect circuit performance or reliability. Contact Linear
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
design a circuit that meets customer-supplied specifications;
however, it remains the customer's responsibility to verify proper
substitution and printed circuit board layout may significantly
affect circuit performance or reliability. Contact Linear
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
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 representa­tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
VIN
4.7uF
4.7uF
CMDSH-3D1CMDSH-3
VINF
20
BG1
ITH1
C2
R2
0
D2
C11
C11
0.1uF
0.1uF
C17
C17
R18 2.2R18 2.2
INTVCC
19
18
17
VIN
BG2
INTVCC
ITH2
VFB2
VFB1
R32 20.0KR32 20.0K
R33 20.0KR33 20.0K
C43 100pFC43 100pF
C42
100pF
C42
100pF
R31
[1]
R31
[1]
0.1uFC20.1uF
OPTR2OPT
VOUT1
16
PGND
6
TRK/SS2
C44
C44
R35
R35
R34
R34
R250R25
15
9
RUN2
1nF
1nF
0
BOOST2
RUN2
OPT
OPT
CMDSH-3D2CMDSH-3
13
14
TG2
SW2
ILIM10EXTVCC11PGOOD
VIN
[1]
[1]
R36 0R36 0
E10E10
TRK/SS2
C21
C21
S2+
8
12
C47
C47
R37
R37
0.1uF
0.1uF
C15
C15
7
SENSE2+
0.1uF
0.1uF
OPT
OPT
SENSE2-
SGND
R38
R38
R40
100
R40
100
1nF
1nF
S2-
R39
100
R39
100
29
R43
[1]
R43
[1]
C49
OPT
C49
OPT
R44
OPT
R44
OPT
R42
OPT
R42
OPT
R41
OPT
R41
OPT
INTVCC
C48
OPT
C48
OPT
3
JP2JP2
OFF
E2E2
RUN2
OPT
OPT
1ON2
GND
INTVCC
EXTVCC
E3E3
R46
R46
C50
1uF
C50
1uF
EXTVCC
INTVCCVINF
R60
OPT
R60
OPT
STUFF R60 WITH 0 OHMS FOR
100K
100K
PGOOD
E4E4
PGOOD
4.6V<VIN<5.5V
NOTE:
D1
C20
0.1uF
C20
0.1uF
R30
100
R30
100
C14
1nF
C14
1nF
R9 0R9 0
S1+
S1-
R29
100
R29
100
27
23
28
22
21
TG1
SW1
BOOST1
SENSE1-
SENSE1+
U1
U1
LTC3850EUF
LTC3850EUF
TRK/SS11ITH12VFB13VFB24ITH25TRK/SS2
MODE24FREQ
RUN1
25
26
TRK/SS1
RUN1
C12
1nF
C12
1nF
0
[1]
[1]
R80R8
R10
R10
R28
OPT
R28
OPT
C38
OPT
C38
OPT
3
JP1JP1
OFF
C41 1nFC41 1nF
R30R3
E9E9
TRK/SS1
&
8.66K
5.9K
ITH1 ITH2
R43
25.5K
10.0K
4
30.1K
17.8K
VOUT1 VOUT2
TOP FEED BACK R
RENESAS RJK0330DPB
3
RENESAS RJK0305DPB RENESAS RJK0330DPB
RENESAS RJK0305DPB
0.4uH
2
TOKO FDU0650-R56M=P3
0.003
0.002 VITEC 59PR9875
1.8V/10A
1.2V/15A
VOUT1
THESE ARE ONLY INTENDED TO KELVIN SENSE THE OUTPUT VOLTAGE ACROSS COUT1
AND COUT4.
ASSY VOUT2 RS1, RS2 L1, 2 Q1, 3 Q2, 4 R27 R31, R35
2. FSW = 400kHz For Assy - B
3. DO NOT APPLY LOAD FROM THE VO1+ TO VO1- OR FROM THE VO2+ TO VO2- TURRETS.
1. FSW = 500kHz For Assy - A
2.0V/10A
- A
1.5V/15A
- B
1
[1]
dc1185b-a/-bf
9
Page 10
DEMO MANUAL DC1185B-A/-B
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica­tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
Linear Technology Corporation
10
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
dc1185b-a/-bf
LT 1213 • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2013
Page 11
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Analog Devices Inc.: DC1185B-A DC1185B-B
Loading...