DC2173A - Demo Manual

DEMO MANUAL DC2173A
LTC3769
60VIN, Low IQ Synchronous
Boost Controller
DESCRIPTION
Demonstration circuit DC2173A is a DC/DC synchronous
boost converter featuring the LTC®3769 constant frequency
current mode synchronous boost controller. The DC2173A
generates a 48V output voltage and provides 1.5A to 6A
of output current.
1.Directly from the input voltage
The 150kHz constant switching frequency operation results
in a small and efficient circuit.
The onboard low power bias supply, based on LTC3630
high efficiency, 65V 500mA synchronous step-down converter provides a stable 10V bias voltage, which increases
the overall efficiency at high input voltages.
This board operates over a wide 6V to 60V input voltage range, has a 28µA quiescent current during standby
mode, and has a low power onboard bias supply along
with adjustable current limit. The user can select Burst
Mode® operation, pulse skipping, or continuous conduction
mode at light loads via an onbourd jumper. This converter
provides high output voltage accuracy (typically ±3%) over
the entire load and temperature range.
The DC2173A supports the following methods for biasing
the LTC3769 onboard controller as follows:
PERFORMANCE SUMMARY
2.With the onboard low power bias supply
3.From the output voltage after start-up
4.Connecting to an external voltage source
The DC2173A has a small circuit footprint and is a high
performance, cost effective solution for telecom, automotive and Power over Ethernet applications.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2173A
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Specifications are at TA = 25°C
PARAMETER
CONDITIONS
Minimum Input Supply Voltage
IOUT = 0A to 1.5A
6
V
Maximum Input Supply Voltage
IOUT = 0A to 6.0A
60
V
Output Voltage Range
VIN = 6V to 36V, IOUT = 0A to 6.0A
Typical Switching Frequency
Typical Output Ripple (VOUT, 48V)
Efficiency Typical (VOUT, 48V, VIN 12V)
ILOAD = 3A
MIN
TYP
48 ±3%
MAX
UNITS
V
150
kHz
200
mV
96
%
dc2173afa
1
DEMO MANUAL DC2173A
QUICK START PROCEDURE
Demonstration circuit 2173A is easy to set up to evaluate the performance of the LTC3769 controllers. Refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below:
NOTE. When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the VIN or
VOUT and GND terminals. See Figure 2 for proper scope
probe technique.
1.Place jumper RUN (J2) in ON position, place jumper
MODE (JP1) in PULSE SKIP position.
2.Place jumper AUX (JP4) in ON position.
3.Place jumper OVP (JP3) in OFF position.
4.With power off, connect the input power supply to VIN
and GND.
Turn the input power source on and slowly increase the
input voltage. Be careful not to exceed 60V.
NOTE: Make sure that the input voltage VIN does not exceed 60V. If higher operating voltage is required, power
components with higher voltage ratings should be used.
4.Check for the proper output voltage of 48V. If there
is no output, temporarily disconnect the load to make
sure that the load is not set too high.
To synchronize DC2173A with external clock insert jumper
MODE (JP1) in BURST position and apply clock signals
to terminal CLKIN (E12).
DC2173A Bias Circuits
The demo board DC2173A shipped to be biased from the
internal low power bias supply based on LTC3630. It’s
accomplished by populating R42, which connect output
of auxiliary power supply to VBIAS. If input or output
voltages are desired as a bias source, then resistors R31
or R32 should be installed, instead of R42. Another possibility is to use external power source, by connecting it
to terminal EXTVCC (E13). Please refer to LTC3769 data
sheet for details. On board low power converter can be
disabled by placing jumper AUX (JP4) in OFF position.
Converter Efficiency
DC2173A exceeds 96% efficiency at 12V input voltage
generating 48V at 3A, see Figure 3. DC2173A delivers 3A
of output current at 12V input; however output current
changes in a range from 1.5A to 6A depending on input
voltage. Figure 4 demonstrates maximum output current,
as function of input voltage, assuming 48V output voltage.
All measurements were conducted at room temperature,
natural convection cooling with no air flow.
5.Once the proper output voltages are established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
dc2173afa
2
DEMO MANUAL DC2173A
QUICK START PROCEDURE
GND
VIN
Figure 1. Proper Measurement Equipment Setup
Figure 2. Measuring Input or Output Ripple
97.0
7
96.5
6
95.5
5
95.0
IOUT (A)
EFFICIENCY (%)
96.0
94.5
94.0
4
3
93.5
14V
12V
10V
6V
93.0
92.5
92.0
0.5
1.0
2.0
1.5
LOAD (A)
2.5
2
1
3.0
dc2173a F03
Figure 3. DC2173A, Efficiency vs Load for
Different Input Voltages
5
10
15
VIN (V)
20
25
dc2173a F04
Figure 4. Maximum Output Current vs Input Voltage
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
3
CIN1, COUT6, COUT7
CAP., 33µF, 63V, EP-CAP
SUN ELECTRONICS, 63HVH33M
2
8
CIN2-CIN4, COUT1-COUT5
CAP., X7S, 4.7µF 100V, 20%, 1210
TDK, C3225X7S2A475M
3
1
C2
CAP., NPO, 100pF, 25V, 10%, 0603
AVX, 06033A101KAT2A
4
1
C3
CAP., X7R, 15nF, 25V, 10%, 0603
AVX, 06033C153KAT2A
dc2173afa
3
DEMO MANUAL DC2173A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
5
4
C4, C15, C16, C17
CAP., X5R, 0.1µF, 25V, 10%, 0603
AVX, 06033D104KAT2A
6
1
C5
CAP., NPO, 1000pF, 25V, 10%, 0603
AVX, 06033A102KAT2A
7
1
C8
CAP., X5R, 4.7µF, 25V, 10%, 0805
AVX, 08053D475KAT2A
8
1
C18
CAP., X7R, 0.1µF, 100V, 10%, 1206
AVX, 12061C104KAT2A
9
1
C20
CAP., X7R, 47nF, 25V, 10%, 0603
AVX, 06033C473KAT2A
10
1
C21
CAP., X5R, 22µF, 16V, 10%, 1206
AVX, 1206YD226KAT2A
11
2
C22, C23
CAP., X7R, 2.2µF, 100V, 10%, 1206
MURATA, GRM31CR72A225KA73
12
1
D1
DIODE, SCHOTTKY 70V 0.07A SOD323-2
INFINEON, BAS 170W E6327
13
1
L1
IND, 10µH
COILCRAFT, SER2918H-103KL
14
1
L2
INDUCTOR, POWER 220µH 0.51A SMD
WURTH ELEC., 744775222
15
3
Q1, Q2, Q3
MOSFET, N-CH 60V 100A TDSON-8
INFINEON, BSC028N06LS3 G
16
2
RSNS1, RSNS2
RES., 0.006Ω 1/2W 1% 2010 SMD
VISHAY, WSL20106L000FEA
17
5
R2, R3, R13, R15, R42
RES., CHIP, 0Ω, 1%, 0603
VISHAY, CRCW06030000Z0EA
18
1
R5
RES., CHIP, 30.1k, 1%, 0603
VISHAY, CRCW060330K1FKEA
19
1
R6
RES., CHIP, 475k, 1%, 0603
VISHAY, CRCW0603475KFKEA
20
1
R8
RES., CHIP, 12.1k, 1%, 0603
VISHAY, CRCW060312K1FKEA
21
1
R9
RES., CHIP, 15k, 1%, 0603
VISHAY, CRCW060315K0FKEA
22
1
R17
RES., CHIP, 10Ω, 1%, 0603
VISHAY, CRCW060310R0FKEA
23
2
R26, R35
RES., CHIP, 100k, 1%, 0603
VISHAY, CRCW0603100KFKEA
24
1
R33
RES., CHIP, 150k, 1%, 0805
VISHAY, CRCW0805150KFKEA
25
1
R34
RES., CHIP, 38.3k, 1%, 0603
VISHAY, CRCW060338K3FKEA
26
1
R39
RES., CHIP, 47k, 1%, 0603
VISHAY, CRCW060347K0FKEA
27
1
R40
RES., CHIP, 523k, 1%, 0603
VISHAY, CRCW0603523KFKEA
28
1
R41
RES., CHIP, 80.6k, 1%, 0603
VISHAY, CRCW060380K6FKEA
29
1
U1
I.C. LTC3769IUFD, QFN24UF-4X4
LINEAR TECH., LTC3769IUFD#PBF
30
1
U2
I.C. LTC3630AEMSE, MSE-16L
LINEAR TECH., LTC3630AEMSE#PBF
Additional Demo Board Circuit Components
1
1
C19
OPT
2
3
D2, D3, D4
OPT
3
1
Q4
OPT
4
10
R1, R4, R10, R11, R12, R14, R31,
R32, R37, R38
OPT
Hardware: For Demo Board Only
1
9
E1-E9
TURRET, TESTPOINT, 091"
MILL-MAX, 2501-2-00-80-00-00-07-0
2
1
JP1
HEADER, 2X3 6POS 0.100" DUAL GOLD
SAMTEC, TSW-103-07-L-D
3
3
JP2, JP3, JP4
HEADER, 2mm SINGLE STR 3POS
SULLINS, NRPN031PAEN-RC
4
4
J1, J2, J3, J4
BANANA JACK NON-INSULATED 0.218"
KEYSTONE, 575-4
5
1
XJP1
SHUNT, 2POS0 0.100" (2.54mm) CTRS
SAMTEC, SNT-100-BK-G
6
3
XJP2, XJP3, XJP4
SHUNT, 2mm CTRS
SAMTEC, 2SN-BK-G
7
4
MTGS
HEX STANDOFF 6-32 NYLON 3/4"
KEYSTONE, 1903D
8
4
MTGS
MACHINE SCREW, PAN PHILLIPS 6-32
B & F, PMSSS 632 0038 PH
dc2173afa
4
A
B
C
D
*
R35
JP3
OVP
JP2
3
2
1
3
2
1
100K
OVMODE
INTVCC
6
4
2
MODE
JP1
R33
150K
0805
R34
38.3K
VIN
5
3
1
INTVCC
D2
OPT
SGND
R5
30.1k
R10
OPT
INTVCC
U1
11
12
RUN
SS
8
9
7
LTC3769EUF
5
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
OPT
C19
4
INTVCC
SS
RUN
SGND
PLLIN / MODE
FREQ
OPT
R11
1000pF
C5
C15
0.1uF
INTVCC 5
R4
OPT
50mV
R1 75mV FLOAT
OPT
100mV
VOUT FOLLOWS VIN WHEN VIN > REGULATED VOUT
ON
OFF
OFF
ON
E9
E8
NOTES:
RUN
CLKIN
BURST MODE
(SYNC)
EXTVCC
RUN
INTVCC
E7
E6
PULSE SKIP
CCM
GND
EXTVCC
E5
13
100K
19
R8
12.1K
15K
R9
OVMODE
PGND
INTVCC
EXTVCC
PGND
VBIAS
BG
BOOST
C16
0.1uF
R3
0
R6
475K
0805
C3
15nF
0
R2
VBIAS
VOUT
0.1uF
C17
EXTVCC
0
3
R15
D1
BAS170W
1
2
OPT
R31
C8
4.7uF
0805
VBIAS
C4
0.1uF
C2
100pF
10
22
23
24
1
21
20
SENSE1+
SENSE1-
VIN
R32
4
OFF
ON
INTVCC
INTVCC
0
OPT
R42
VOUT
VAUX
5
Q1
OPT
4
JP4
AUX
3
2
1
4
Q2
BSC028N06LS3
1
2
3
R26
3
Q3
BSC028N06LS3
R39
47K
R38
OPT
5
3
11
12
C23
2.2uF
100V
1206
COUT1
4.7uF
100V
3225
ISET
FBO
RUN
VIN
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SW
10
6
7
SCALE = NONE
VICTOR K.
LT
APPROVALS
SS
VPRG2
VPRG1
9
1
COUT3
4.7uF
100V
3225
R12
OPT
VFB
COUT2
4.7uF
100V
3225
SER2918H-103
L1
10uH
R14
OPT
U2
LTC3630AEMSE
CUSTOMER NOTICE
R37
OPT
C18
0.1uF
100V
1206
C22
2.2uF
100V
1206
D3
OPT
2
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
D4
OPT
VIN
Q4
BSC028N06LS3
4
1
2
3
PGOOD
1
2
14
SENSE1-
2
ILIM
3
SENSE1+
15
VFB
16
ITH
17
SW
5
1
2
3
5
1
2
3
18
PGOOD
OVMODE
TG
PGND
25
5
1
2
3
INTVCC
GND
4
GND
8
GND
16
GND
14
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.
17
5
1
VAUX
C21
22uF
16V
1206
63HVH33M
CIN1
33uF
63V
+ COUT7
33uF
63V
63HVH33M
VOUT
+
DATE
E4
J4
*
VOUT
GND
VOUT-
*
VOUT+
VIN-
GND
6 - 60V
VIN
VIN+
48V / 1 - 3.0A
J3
E3
E2
J2
J1
E1
VICTOR K. 05-01-2014
APPROVED
DATE:
N/A
SIZE
LTC3769EUF
SHEET 1
1
DEMO CIRCUIT 2173A
Thursday, May 01, 2014
IC NO.
2
OF 1
REV.
HIGH VOLTAGE, LOW IQ, SYNCHRONOUS BOOST CONVERTER
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
CIN4
4.7uF
100V
3225
+ COUT6
33uF
63V
63HVH33M
CIN3
4.7uF
100V
3225
VIN
PRODUCTION
DESCRIPTION
REVISION HISTORY
TECHNOLOGY
R41
80.6K
R40
523K
COUT5
4.7uF
100V
3225
CIN2
4.7uF
100V
3225
TITLE: SCHEMATIC
C20
47nF
220uH
L2
COUT4
4.7uF
100V
3225
0.006
2010
RSNS1
0.006
2010
R13
0
2
-
RSNS2
R17
10
REV
ECO
A
B
C
D
DEMO MANUAL DC2173A
SCHEMATIC DIAGRAM
dc2173afa
5
DEMO MANUAL DC2173A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) 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 LTC 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 LTC 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. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC 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
dc2173afa
6
Linear Technology Corporation
LT 0714 • REV A PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
Similar pages