DC1819A - Demo Manual

DEMO MANUAL DC1819A
LTC4415EMSE
Dual 4A Ideal Diodes with
Adjustable Current Limit
DESCRIPTION
Demonstration circuit 1819A features the LTC®4415EMSE
dual ideal diodes. Each independent ideal diode can be
used to replace a standard diode for improved low forward
drop in applications requiring maximum headroom and
overall system efficiency.
EN1 and EN2. As initially configured, by setting to BOTH
the user can apply input voltages and loads on each diode
independently. Selecting PRIORITY allows the LTC4415 to
automatically switch over between inputs when the proper
input voltage threshold on IN1 is achieved.
The input supply voltage ranges are from 1.7V to 5.5V for
each input/output pair. As initially configured, LTC4415 can
provide a maximum current limit of 4A for each diode,
but is jumper-selectable up to 6A (internal current limit).
The voltage of the current limit pins, CLIM1 and CLIM2,
can also be monitored for a scaled representation of the
output current.
Status and warning LEDs and test points are provided for
the logic output pins STAT1, STAT2 and WARN1, WARN2,
respectively.
For evaluation, each diode can be controlled by the ENABLE CONTROL jumper, JP1, or by the enable input pins,
PERFORMANCE SUMMARY
Optionally, the LTC4415EDHC version can also be used
for evaluation. It is a pin-compatible drop-in replacement.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
(TA = 25°C)
PARAMETER
CONDITIONS
VALUE
Minimum Input Voltage
VINx
1.7V
Maximum Input Voltage
VINx
5.5V
Maximum Output Current
CLIMx Resistor-Adjustable
4A
CLIMx Internal Limit
6A
CLIMx Clamp Voltage
Current Limit
0.5V
Forward Voltage Drop
VINx = 3.6V, IOUTx = 1A
50mV Typ
Reverse Turn-Off Voltage
VINx – VOUTx
–30mV
Enable Threshold
EN1 and EN2
800mV
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DEMO MANUAL DC1819A
QUICK START PROCEDURE
Demonstration circuit 1819A is easy to set up to evaluate
the performance of the LTC4415. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below.
1. Set the jumpers as below:
JP1
JP2
JP3
BOTH
4A
4A
2. With all power off, connect input 1 and 2 (VIN1 and
VIN2) power supplies capable of at least 4A each, the
loads (VOUT1 and VOUT2), and meters as shown in
Figure 1.
3. Preset the system loads to 0A and the input supplies
to 0V, 0A current limit.
4. Turn on the supplies, setting the current limit above 4A.
Adjust the voltages to the desired value, up to 5.5V.
Optional
1. For prioritization enable switchover set jumper JP1 to
PRIORITY.
2. For independent, external control of the enable pins,
remove the shunt on jumper JP1. Apply the logic control
signal on EN1 and EN2 as necessary.
3. With all power off, change the CLIM1 and CLIM2 settings
on jumpers JP2 and JP3 for different current limits.
4. For load sharing or evaluation of the diode-OR function, connect the two diode outputs, OUT1 and OUT2,
together. The source of highest voltage will appear at
the output.
5. For independent path control from a common input,
connect the two diode inputs, IN1 and IN2, together.
5. Turn on the loads and adjust as necessary.
6. Monitor CLIM1 and CLIM2 pin voltages for a scaled
representation of the output currents.
7. Adjust the supply voltages further and observe how the
output states change accordingly. STAT1 and STAT2 will
change state if the input voltage drops below the UVLO
threshold.
8. Adjust the loads into current limit and observe how the
WARN1 and WARN2 states change accordingly.
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DEMO MANUAL DC1819A
QUICK START PROCEDURE
+
VIN1
+
–
+
+
–
–
–
LOAD1
+
VIN2
+
–
+
+
–
–
–
LOAD2
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC1819A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
4
C1, C2, C3, C4
CAP, CHIP, X5R,10μF, ±10%, 16V, 0805
MURATA, GRM21BR61C106KE15L
2
1
R1
RES, CHIP, 100k, ±1%, 1/16W, 0402
VISHAY, CRCW0402100KFKED
3
1
R2
RES, CHIP, 2k, ±1%, 1/16W, 0402
VISHAY, CRCW04022K00FKED
4
1
R3
RES, CHIP, 21.5k, ±1%, 1/10W, 0402
VISHAY, CRCW040221K5FKED
5
2
R9, R10
RES, CHIP, 1k, ±1%, 1/16W, 0402
VISHAY, CRCW04021K00FKED
6
1
U1
IC, LTC4415EMSE
LINEAR TECH., LTC4415EMSE#PBF
Additional Demo Board Circuit Components
1
4
C5, C6, C7, C8
CAP, CHIP, X5R,10μF, ±10%, 6.3V, 0603
TDK, C1608X5R0J106K
2
2
D1, D2
LED, SMT, GREEN, 0603
LITE-ON, LTST-C190KGKT
3
2
D3, D4
LED, SMT, YELLOW, 0603
LITE-ON, LTST-C190YKT
4
2
R4, R5
RES, CHIP, 10k, ±5%, 1/16W, 0402
VISHAY, CRCW040210K0JNED
5
2
R6, R13
RES, CHIP, 143Ω, ±1%, 1/16W, 0402
VISHAY, CRCW0402143RFKED
6
2
R8, R12
RES, CHIP, 332Ω, ±1%, 1/16W, 0402
VISHAY, CRCW0402332RFKED
7
4
R14, R15, R16, R17
RES, CHIP, 1k, ±5%, 1/16W, 0402
VISHAY, CRCW04021K00JNED
8
2
R7, R11
RES, CHIP, 1k, ±1%, 1/16W, 0402
VISHAY, CRCW04021K00FKED
9
4
R18, R19, R20, R21
RES, CHIP, 1Ω, ±5%, 1/16W, 0402
VISHAY, CRCW04021R00JNED
TEST POINT, TURRET, 0.094"
MILL-MAX, 2501-2-00-80-00-00-07-0
Hardware/Components (For Demo Board Only)
2
8
E1, E2, E5, E8, E14, E15, E16, E17
1
9
E3, E4, E6, E7, E9, E10, E11, E12, E13
TEST POINT, TURRET, 0.061"
MILL-MAX, 2308-2-00-80-00-00-07-0
3
1
JP1
3 Pin Jumper, 2mm
SAMTEC, TMM-103-02-L-S
4
2
JP2, JP3
2 × 5 Pin Jumper, 2mm
SAMTEC, TMM-105-02-L-D
5
3
JP1-3
6
4
SHUNT, 2mm
SAMTEC, 2SN-KB-G
STAND-OFF, NYLON, 0.500"
KEYSTONE, 8833
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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.
1
2
3
4
E4
E3
E2
GND
CLIM2
CLIM1
GND
E9
E8
E7
E6
1.7V - 5.5V
VIN2
EN2
EN1
GND
1.7V - 5.5V
E5
R19
1
5%
4
R6
143
R5
10k
R4
10k
C6
10μF
6.3V
0603
VIN2
BOTH
JP1
R8
332
R7
1k
R9
1k
R10
1k
CLIM2
JP3
Iout (A) = 500/RCLPROG
CLIM1
JP2
R3
21.5k
R2
2k
ENABLE
CONTROL
R1
100k
INTERNAL 6A
4A
2A
1A
0.5A
PRIORITY
R18
1
5%
C5
10μF
6.3V
0603
R11
1k
6A INTERNAL
4A
2A
1A
0.5A
R12
332
3
R13
143
C2
10μF
16V
0805
C1
10μF
0805
16V
4
5
7
8
6
3
1
2
CLIM1
CLIM2
IN2
IN2
EN2
EN1
IN1
IN1
OUT2
OUT2
OUT1
OUT1
WARN2
STAT2
WARN1
STAT1
10
9
16
15
12
11
13
14
C3
10μF
16V
0805
C4
10μF
16V
0805
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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.
CUSTOMER NOTICE
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
17
GND
U1
LTC4415EMSE
1
R14
1K
5%
GRN
D1
STAT1
VIN1
SCALE = NONE
NC
JOSH Y.
PCB DES.
APP ENG.
APPROVALS
2
E1
2
1
2
VIN1
3
R16
1K
5%
GRN
D3
STAT2
VIN2
2
REV
DESCRIPTION
YLW
TECHNOLOGY
R20
1
5%
C7
10μF
6.3V
0603
R21
1
5%
C8
10μF
6.3V
0603
E14
E13
E12
E11
E18
E17
E16
GND
VOUT2
1.7V - 5.5V
4A
GND
WARN2
E15
VOUT1
1.7V - 5.5V
4A
STAT2
DATE
08-19-11
WARN1
STAT1
E10
GND
JOSH Y.
APPROVED
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
PRODUCTION FAB
D4
WARN2
R17
1K
5%
1
REVISION HISTORY
IC NO.
DATE: 08-19-11
N/A
SIZE
1
LTC4415EMSE
DEMO CIRCUIT 1819A
SHEET 1
OF
1
2
REV.
DUAL 4A IDEAL DIODES WITH ADJUSTABLE CURRENT LIMIT
TITLE: SCHEMATIC
R15
1K
5%
YLW
D2
WARN1
ECO
1
2
4
1
2
VIN1
1
2
3
4
DEMO MANUAL DC1819A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC1819A
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
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Linear Technology Corporation
LT 1011 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 2011
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