DC2161A - Demo Manual

DEMO MANUAL DC2161A
LTC4231 Micropower
Hot Swap Controller
DESCRIPTION
Demonstration circuit 2161A showcases the LTC®4231
Micropower Hot Swap™ Controller in a 12V, 3A application. Included on the board are input overvoltage and
reverse voltage protection, input voltage dividers for UV
and OV detection, an output voltage LED, jumpers to
disable UV/OV, manual and remote enable control, and
quiescent current measurement. There are turrets provided
to monitor input voltage, output voltage, output status,
quiescent current, several ground connections, timer pin,
and control the ON pin. Input, output and return voltages
PERFORMANCE SUMMARY
are provided on banana jacks. The DC2161A-A version is
used to demonstrate the LTC4231-1 which remains off
after a current fault, while the DC2161A-B demonstrates
the LTC4231-2 which automatically reapplies power after
a cool-down period.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2161A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
Specifications are at TA = 25°C
Table 1
PARAMETER
CONDITIONS
VALUE
Input Supply Voltage Range
Limited by Transient Surge Protector
–24V to +24V
Nominal Operating Voltage
12V
Overvoltage Lockout
Nominal
14.4V
Undervoltage Lockout (Voltage Falling)
Nominal
9.6V
Undervoltage Lockout (Voltage Rising)
Nominal
10.8V
Output Current Limit
3A
Maximum Load Capacitance
600µF
Timer Expiration Period
2ms
Table 2. Power Input and Output Connections
NOMENCLATURE
CONNECTOR
Table 3. Test Points
DESCRIPTION
NOMENCLATURE
VIN 12V
J1
12V Input
VIN 12V
GND
J2
12V Input Return
GND
VOUT 12V, 3A
J3
12V Output
GND
J4
12V Output Return
TURRET
E1
E2, E4,
E6, E8
DESCRIPTION
12V Input Monitor
Ground
VOUT 12V, 3A
E3
12V Output Monitor
STATUS
E5
Status, Open Drain when Output
Enabled
GND
E6
Ground
IQ
E7
Quiescent Current Monitor. Use
Microammeter at This Point When JP2
Selects MEASURE IQ.
ON
E9
Enable LTC4231 Output. Enables Output
or Selects External Control of Output
TIMER
E10
TIMER Pin
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DEMO MANUAL DC2161A
JUMPERS
DC2161A contains 3 jumpers. A description of each
jumper follows.
JP1, UV/OV. This jumper selects whether or not undervoltage or overvoltage lockout is enabled. When the jumper
is in the disable position, a UV or OV condition will not
block operation of the Hot Swap Controller. The default
is ENABLE.
JP2, IQ. The LTC4231 is a low power device, meaning it
draws very little current to perform its function. Any board
leakage on the GATE pin caused by board contamination or
a defective MOSFET will cause this current to increase. JP2,
when in the MEASURE IQ position, facilitates measurement
of the quiescent current of the LTC4231 exclusive of the
current of other components on the board, such as LED
D2, output coupling capacitor C3, TVS diode D1, capacitor
C1, voltage divider R6, R7, R8 and R9, or any leakage on
the board. This current is measured via a microammeter
connected between turret E7 and GND. If the MEASURE IQ
position is selected, verify a microammeter is connected
to prevent damage to the board via leakage between VIN
and the gate of the MOSFETs. The default position for JP2
is NORMAL.
JP3, ENABLE. This jumper either enables or disables the
output or provides external control of the output. This is
provided by the ON pin of the LTC4231. When in the ON
position, the 12V VOUT is enabled. When in the OFF position, the 12V VOUT is disabled. When in the EXT position,
the ON pin is connected via a 100kΩ resistor from turret
E9 to the ON pin of the LTC4231. A logic 1 on this pin will
enable the 12V VOUT. The default position for JP3 is ON.
OPERATING PRINCIPLES
The LTC4231 is a Micropower Hot Swap Controller that
has a 2.7V to 36V operating range and a –40V to 40V absolute maximum voltage for the IN pin. This demo circuit
is populated for +12V operation, but it can easily be readjusted for any voltage between 2.7V and 36V by replacing R6, R7, R8, and R9 in the UVL, UVH, and OV divider
string. These values should be selected using guidelines
suggested in the LTC4231 data sheet to minimize current
drain. The DC2161A is populated with a Si7960DP dual
MOSFET with one section used as a pass MOSFET and the
other section used for reverse voltage protection. It also
has a 15mΩ sense resistor. This combination provides
an output current of 3A. Pads are provided on the PCB
for external MOSFET and sense resistor connections for
other voltages and currents.
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DEMO MANUAL DC2161A
QUICK START PROCEDURE
DC2161A is easy to set up to evaluate the performance
of the LTC4231.
Connect a power supply capable of delivering greater than
3.5A of current between 10V and 20V to the VIN jack J1
with its return lead connected to GND J2. Monitor the input
voltage at turrets E1 and E2. Place a voltmeter between
turrets E3 and E4. Connect an ammeter between J3 and the
test loads. Connect the return lead of the test loads to jack
J4. The connections are shown schematically in Figure 1.
The active load should be set to provide a resistive load
since the LTC4231 may not start into a constant current
load. With the resistive load set at 5.4Ω, vary the input
voltage from 9V to 17V and from 17V to 9V to check the
UV and OV thresholds.
Set the input voltage to 12V, vary the load resistance, and
observe output indicator D2. Determine from the ammeter
that the output remains on at 3A (4Ω). The output should
turn off at approximately 3.2A.
Reduce the load resistance to below 4Ω and observe an
auto reset in the DC2161A-B. In the DC2161A-A, power
will have to be removed and then applied to the input to
reset the LTC4231.
Remove the resistive load from the output and replace it
with a 500µF capacitor. Observe the polarity when connecting the capacitor. Upon application of input voltage,
LED D2 should illuminate to indicate VOUT is present. This
indicates the Hot Swap Controller is capable of starting
into a 500µF capacitor.
A
POWER
SUPPLY
V
V
TEST
LOADS
Figure 1. Proper Equipment Measurement Set-Up
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DEMO MANUAL DC2161A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
1
C1
CAP., X7R, 0.1µF 25V, 10%, 0603
MURATA, GRM188R71E104KA01D
2
0
C2
CAP., 0402
OPT
3
1
C3
CAP., TANT, 100µF 25V, 20%, 7343
AVX, TAJE107M025RNJ
4
1
C4
CAP., X7R, 0.082µF 16V, 10%, 0402
MURATA, GRM155R71C823KA88D
5
1
D1
DIODE, SUPPRESSORS,600W, SMB-DIODE
FAIRCHILD SEMI., SMBJ24CA
6
1
D2
LED, GREEN, LED-ROHM-SML-010
ROHM, SML-010FTT86
7
10
E1-E10
TURRET, TESTPOINT 0.064"
MILL-MAX, 2308-2-00-80-00-00-07-0
8
2
JP1, JP2
HEADER, 2mm SINGLE 3POS
SULLINS, NRPN031PAEN-RC
9
1
JP3
HEADER, 2mm DOUBLE 3POS
SAMTEC, TMM-103-02-L-D
10
4
J1, J2, J3, J4
JACK, BANANA
KEYSTONE, 575-4
11
1
Q1
MOSFET, DUAL-CH, 60V, SO8-POWERPAK
VISHAY SILICONIX, Si7960DP-T1-GE3
12
1
R1
RES., CHIP, 10, 1/16W, 1%, 0603
VISHAY, CRCW060310R0FKEA
13
1
R2
RES., SENSE, 0.015, 1/4W, 1%, 1206
VISHAY, WSL1206R0150FEA
14
1
R3
RES., CHIP, 10, 1/16W, 1%, 0402
VISHAY, CRCW040210R0FKED
15
0
R4
RES., 0402
OPT
16
1
R5
RES., CHIP, 3.32kΩ, 1/16W, 1%, 0603
VISHAY, CRCW06033K32FKEA
17
1
R6
RES., CHIP, 1.24MΩ, 1/8W, 1%, 0805
VISHAY, CRCW08051M24FKEA
18
1
R7
RES., CHIP, 12.4kΩ, 1/16W, 1%, 0402
VISHAY, CRCW040212K4FKED
19
1
R8
RES., CHIP, 24.9kΩ, 1/16W, 1%, 0402
VISHAY, CRCW040224K9FKED
20
1
R9
RES., CHIP, 75kΩ, 1/16W, 1%, 0402
VISHAY, CRCW040275K0FKED
21
2
R10, R11
RES., CHIP, 100kΩ, 1/16W, 5%, 0402
VISHAY, CRCW0402100KJNED
22
3
SHUNTS AS
SHOWN ON ASSY
DWG
SHUNT, 2mm CTRS.
SAMTEC, 2SN-BK-G
23
4
MH1-MH4
STAND-OFF, NYLON 0.25"
KEYSTONE, 8831 (SNAP ON)
DC2161A-A Additional Demo Board Circuit Components
1
1
2
1
DC2161A-GENERAL BOM
U1
I.C., MICROPOWER HOT SWAP CONTROLLER, MS12
LINEAR TECH., LTC4231IMS-1
DC2161A-B Additional Demo Board Circuit Components
1
1
2
1
DC2161A-GENERAL BOM
U1
I.C., MICROPOWER HOT SWAP CONTROLLER, MS12
LINEAR TECH., LTC4231IMS-2
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4
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.
A
B
C
GND
VIN
12V
E2
ON
J2
E1
E9
5
2
1
C1
0.1uF
0603
R1
10
0603
1
2
3
R11
100k
R10
100k
JP1
HD1X3-079
DISABLE
ENABLE
UV/OV
*
ASSY
A
B
U1
LTC4231-1
LTC4231-2
SUFFIX
1
2
4
1. ALL CAPACITORS ARE IN MICROFARADS, 0402.
2. ALL RESISTORS ARE IN OHM, 0402.
NOTE: UNLESS OTHERWISE SPECIFIED
D1
SMBJ24CA
R8
23.7k
R7
8.45k
JP3
HD2X3-079
ENABLE
1
2
3
4
5
6
R9
66.5k
R6
1.24M
0805
IN
ON
EXT
OFF
7
6
5
4
2
GNDSW
OV
UVH
UVL
IN
1/4W
1206
12
TIMER
STATUS
SOURCE
11
JP2
IQ
C4
0.082uF
3
BOB S.
KIM T.
2
SCALE = NONE
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
C2
OPT
2
__
ECO
+
2
D2
GREEN
R5
12.1k
0603
E8
E7
E6
E10
E5
J4
DATE
GND
IQ
GND
TIMER
STATUS
GND
VOUT
12V, 3A
08-06-14
LTC4231IMS-1/ 2
DEMO CIRCUIT 2161A
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E4
E3
J3
BOB S.
APPROVED
DATE:
Wednesday, August 06, 2014
IC NO.
1
SHEET 1
2
OF 1
REV.
MICROPOWER HOT SWAP CONTROLLER
N/A
SIZE
DESCRIPTION
PRODUCTION
1
REVISION HISTORY
TECHNOLOGY
C3
100uF
25V
7343
REV
TITLE: SCHEMATIC
OUT
APPROVALS
R4
OPT
Q1B
Si7960DP
6
3
5
NORMAL MEASURE IQ
CUSTOMER NOTICE
10
9
*
R3
10
Q1A
Si7960DP
8
7
1
U1
LTC4231
SENSE
3
2
R2
0.015
3
4
GATE
J1
1
SENSE
ON
GATE
GND
8
4
SOURCE
1
2
3
1
2
D
5
A
B
C
D
DEMO MANUAL DC2161A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC2161A
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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6
Linear Technology Corporation
LT 1114 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
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