DC2011A - Demo Manual

DEMO MANUAL DC2011A
LT8613: 42V, 6A Micropower
Synchronous Step-Down
Regulator with Current Sense
DESCRIPTION
Demonstration Circuit 2011A is a 42V, 6A micropower
synchronous step-down regulator with current sense
featuring the LT®8613. The demo board is designed for
5V output from a 5.8V to 42V input. The wide input range
allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8613 is a compact,
high efficiency, and high speed synchronous monolithic
step-down switching regulator. The integrated power
switches and inclusion of all necessary circuitry reduce
the components count and solution size. Ultralow 3µA
quiescent current in Burst Mode® operation achieves
high efficiency at very light loads. Fast minimum on-time
of 40ns enables high VIN to low VOUT conversion at high
frequency.
The LT8613 switching frequency can be programmed
either via oscillator resistor or external clock over a 200kHz
to 2.2MHz range. The SYNC pin on the demo board is
grounded by default for low ripple Burst Mode operation.
To synchronize to an external clock, move JP1 to SYNC
and apply the external clock to the SYNC turret. Once JP1
is on SYNC position, a DC voltage of 3V or higher can be
applied to the SYNC turret for pulse skipping operation.
The DC2011A has output current limit set at 6A by default. The current limit can be moved to the input side for
application where input supply current is limited. ICTRL
and IMON on the board set and monitor the regulated
current, respectively.
Figure 1 shows the efficiency of DC2011A circuit. Figure 2
shows the LT8613 temperature rising on DC2011A demo
board under different load conditions. The rated maximum
load current is 6A, while derating is necessary for certain
VIN and thermal conditions. The demo board has an EMI
filter installed. To use the EMI filter, the input should be
tied to VEMI terminal, not VIN terminal.
The LT8613 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this demo manual
for DC2011A. The LT8613 is assembled in a 3mm × 6mm
plastic QFN package with exposed pads for low thermal
resistance. Proper board layout is essential for minimum
EMI and maximum thermal performance. See the data
sheet section “PCB Layout” and “High Temperature Considerations”.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2011A
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.
PERFORMANCE SUMMARY
Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
VIN
Input Supply Range
VOUT
Output Voltage
IOUT
Maximum Output Current
fSW
Switching Frequency
EFE
Efficiency at DC
MIN
TYP
MAX
42
V
5
5.125
V
5.8
4.875
Derating Is Necessary for Certain VIN and
Thermal Conditions
6
665
VIN = 12V , IOUT = 3A
UNITS
A
700
94
735
kHz
%
dc2011afa
1
DEMO MANUAL DC2011A
QUICK START PROCEDURE
Demonstration Circuit 2011A is easy to set up to evaluate the performance of the LT8613. Refer to Figure 3 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 4 for the proper
scope technique.
1.Place JP1 on GND position.
2.With power off, connect the input power supply to VIN
and GND.
3.With power off, connect the load from VOUT to GND.
4.Turn on the power at the input.
NOTE. Make sure that the input voltage does not exceed 42V.
5.Check for the proper output voltage (VOUT = 5V).
NOTE. If there is no output, temporarily disconnect the load
to make sure that the load is not set too high or is shorted.
6.Once the proper output voltage is established, adjust
the load within the operating ranges and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
7.An external clock can be added to the SYNC terminal
when SYNC function is used (JP1 on the SYNC position). Please make sure that RT should be chosen to
set the LT8613 switching frequency equal to or below
the lowest SYNC frequency. See the data sheet section
“Synchronization”.
90
100
VIN = 12V
80
TEMPERATURE RISING (°C)
95
EFFICIENCY (%)
90
VIN = 24V
85
80
75
70
VOUT = 5V
fSW = 700kHz
SYNC = GND
65
60
0
1
4
3
2
LOAD CURRENT (A)
5
60
50
40
30
20
VOUT = 5V
fSW = 700kHz
10
6
DC2011A G01
Figure 1. Efficiency vs. Load Current (Using VIN Terminal)
2
70
0
6
12
30
24
18
INPUT VOLTAGE (V)
IOUT = 6A
IOUT = 5.5A
IOUT = 5A
IOUT = 4.5A
IOUT = 4A
36
42
DC2011A G2
Figure 2. Temperature Rising vs. Input Voltage
dc2011afa
DEMO MANUAL DC2011A
QUICK START PROCEDURE
Figure 3. Proper Measurement Equipment Setup
VOUT
GND
Figure 4. Measuring Output Ripple
dc2011afa
3
DEMO MANUAL DC2011A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
CAP., X5R, 10µF, 50V, 10% 1210
MURATA, GRM32ER61H106KA12L
Required Circuit Components
1
1
C2
2
2
C4, C12
CAP., X5R, 0.1µF, 50V, 10% 0402
TDK, C1005X5R1H104K
3
1
C6
CAP., X5R, 100µF, 10V, 20% 1210
MURATA, GRM32ER61A107ME20L
4
2
C7, C11
CAP., X7R, 1.0µF, 25V, 10% 0603
MURATA, GRM188R71E105KA12D
5
1
C8
CAP., X7R, 0.1µF, 50V, 10% 0603
MURATA, GRM188R71H104KA93D
6
1
C9
CAP., C0G, 10pF, 50V, 5% 0603
MURATA, GRM1885C1H100JA01D
7
1
L1
IND, 3.3µH, IHLP2525EZ-01
VISHAY, IHLP2525EZER3R3M01
8
1
R1
RES., CHIP., 0Ω, 1/2W, 1% 1210
VISHAY, CRCW12100000Z0EA
9
1
R5
RES., CHIP., 0.008Ω, 1/2W, 1%, 2010
VISHAY, WSL20108L000FEA
10
2
R6, R7
RES., CHIP., 0Ω, 1/10W, 0603
VISHAY, CRCW06030000Z0EA
11
1
R8
RES., CHIP., 60.4k,1/10W, 1%, 0603
VISHAY, CRCW060360K4FKE
12
2
R9, R12
RES., CHIP., 100k,1/10W, 1%, 0603
VISHAY, CRCW0603100KFKEA
13
1
R10
RES., CHIP., 1M, 1/10W, 1%, 0603
VISHAY, CRCW06031M00FKEA
14
1
R11
RES., CHIP., 243k, 1/10W, 1%, 0603
VISHAY, CRCW0603243KFKEA
15
1
U1
IC, REGULATOR, 28-QFN, UDE
LINEAR TECH., LT8613EUDE#PBF
Additional Demo Board Circuit Components
1
1
C1
CAP., ALUM 22µF 63V
SUNCON, 63CE22BS
2
2
C3, C10
CAP., X5R, 10µF, 50V, 10% 1210
MURATA, GRM32ER61H106KA12L
3
0
C5 (OPT)
CAP., 0603
4
1
C15
CAP., X5R, 0.1µF, 50V, 10% 0402
TDK, C1005X5R1H104K
5
1
FB1
FERRITE BEAD 100Ω 8A SMD 1812
WÜRTH ELEKTRONIK, 74279226101
6
1
L2
IND., 6.8µH, IHLP3232DZ-01
VISHAY, IHLP3232DZER6R8M01
7
0
R2, R3, R4 (OPT)
RES., 0603
8
1
R7
RES., CHIP., 0Ω, 1/10W, 1%, 0603
VISHAY, CRCW06030000Z0EA
Hardware/Components (For Demo Board Only)
4
1
12
E1-E12
TESTPOINT, TURRET, 0.094"
MILL-MAX, 2501-2-00-80-00-00-07-0
2
1
JP1
HEADER, 3-PIN 0.079" SINGLE ROW
SULLINS, NRPN031PAEN-RC
3
1
XJP1
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
4
4
MH1-MH4
STAND-OFF, NYLON 0.50" TALL
KEYSTONE, 8833 (SNAP ON)
dc2011afa
DEMO MANUAL DC2011A
SCHEMATIC DIAGRAM
D
C
B
A
E2
E1
VIN
5.8V - 42V E12
VEMI
GND
C15
0.1uF
50V
0402
5
5
FB1
74279226101
C3
10uF
50V
1210
E7
E6
E9
E5
E8
4
+ C1
22uF
63V
SUNCON
63CE22BS
L2
6.8uH
IHLP3232DZER6R8M01
C10
10uF
50V
1210
EN/UV
SYNC
GND
IMON
ICTRL
TR/SS
E11
SYNC
GND
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
4
JP1
3
2
1
R1
R2
OPT
0
1210
R3
OPT
C2
10uF
50V
1210
C7
1uF
25V
ISN
3
R12
100k
R4
OPT
R8
60.4k
U1
LT8613EUDE
BST
ICTRL
ISN
ISP
SW
SW
SW
SW
SW
INTVCC
FB
PG
BIAS
RT
TR/SS
IMON
SYNC
EN/UV
5
6 VIN
7 VIN
VIN
4
1
27
28
21
2
3
8
9 PGND
10 PGND
PGND
20
15
16
17
18
19
26
25
22
24
23
2
2
C4
0.1uF
0402
L1
3.3uH
C5
OPT
R10
0
R6
0
R7
1Meg
C9
100k
R9
IHLP2525EZER3R3M01
ISP
ISN
R11
243k
10pF
R5
0.008
2010
VOUT
1
C6
100uF
10V
1210
1
*
E3
PG
GND
*
VOUT
5V / 6A
SEE DEMO MANUAL
C11
1uF
E4
E10
D
C
B
A
dc2011afa
5
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.
ISP
C12
0.1uF
50V
0402
C8
0.1uF
3
11
12 GND
13 GND
14 GND
GND
29
GND
DEMO MANUAL DC2011A
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
6
dc2011afa
Linear Technology Corporation
LT 0515 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 2015
Similar pages