DC2116A - Demo Manual

DEMO MANUAL DC2116A
LTC4233/LTC4234
10A/20A Guaranteed SOA
Hot Swap Controller
Description
Demonstration circuit 2116A features the LTC4233/
LTC®4234 10A/20A Guaranteed SOA Hot Swap™ Controllers.
The LTC4233 and LTC4234 are ideally suited for compact
power distribution control in 2.9V to 15V applications for
hot board insertion protection, high side power switching,
and electronic circuit breaker functions. They provide a rich
set of features to support Hot Swap applications including:
• 2.5% Accurate Undervoltage and Overvoltage Protection
• Overtemperature Protection
• Configurable for Auto Retry or Latch Off for Overcurrent
Faults
• Power Good and Fault Outputs
Available in 38-pin 5mm × 9mm QFN packages, the
LTC4234 is showcased on DC2116A-A while the LTC4233
is showcased on DC2116A-B, both configured for a 12V
application. By changing a few passive components, 2.9V
to 15V applications can easily be evaluated.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2116A
• Adjustable Inrush Current Control
• Adjustable, 11% Accurate Current Limit
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.
• Adjustable Output Voltage Ramp Rate
Performance Summary
PARAMETER
Specifications are at TA = 25°C
CONDITIONS
Input Supply Voltage Range
VALUE
2.9V to 15V
Nominal Operating Voltage
12.0V
Overvoltage Lockout
Nominal
15.2V
Undervoltage Lockout (Voltage Falling)
Nominal
9.2V
Undervoltage Lockout (Voltage Rising)
Nominal
9.9V
Output Current Limit
Nominal (LTC4233)
11.2A
Nominal (LTC4234)
22.5A
Maximum Load Capacitance
Nominal
8200µF
Timer Expiration Period
Nominal
1.2ms or 2.0ms
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1
DEMO MANUAL DC2116A
Quick Start Procedure
Table 1. Power Input and Output Connections
NOMENCLATURE
CONNECTOR
DESCRIPTION
VDD
E13
12V In
GND
E14
12V In Return
VOUT
E6
12V Out
GND
E7
12V Out Return
NOMENCLATURE
TURRET
DESCRIPTION
INTVCC
E1
INTVCC monitor
TIMER
E2
TIMER pin monitor
PG
E3
PG pin monitor
ISET
E4
ISET pin monitor
IMON
E5
IMON pin monitor
GND
E8
VOUT return monitor
VOUT
E9
VOUT monitor
UV
E10
UV pin monitor
OV
E11
OV pin monitor
VDD
E12
VDD monitor
GND
E15
VDD return monitor
SENSE
E16
SENSE pin monitor
FLT
E17
FLT pin monitor
GATE
E18
GATE pin monitor
GND
E19, E20, E21
Ground
NOMENCLATURE
PART DESIGNATOR
DESCRIPTION
FAULT
D1 (Red)
Indicates Overcurrent Fault
POWER BAD
D2 (Red)
VOUT Not Up to Full Voltage
INPUT POWER
D3 (Green)
Input Voltage Present
OUTPUT POWER
D4 (Green)
Output Voltage Present
Table 2. Test Points
Table 3. LED Indicators
Table 4. Jumpers
NOMENCLATURE
PART DESIGNATOR
DESCRIPTION
AUTORETRY
JP1
ON Position for Autoretry
TIMER DURATION
JP2
1.2ms or 2.0ms Timer Duration
2
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DEMO MANUAL DC2116A
DC2116A-A Quick Start Procedure
DC2116A-A is easy to set up to evaluate the performance
of the LTC4234. Refer to Figure 1 for proper measurement
equipment setup and follow the procedure below.
Set an adjustable power supply, capable of supplying 30
amps, at 16V. Turn off power and connect the supply to
the VDD and GND banana jacks.
DC2116A has two user configurable jumper options:
Connect a suitable load to the VOUT and GND banana
jacks. This load can be an electronic load or power resistors capable of dissipating 300W.
• JP1 AUTORETRY – Set to ON for auto retry or OFF for
latch off on over-current faults. (Default position: OFF)
• JP2 TIMER DURATION – Set to 2ms for the internal 2ms
timer or 1.2ms determined by C2, C2 may be replaced
for other timer durations. (Default position: 1.2ms)
LEDs indicate the state of input power (D2), output power
(D4), FAULT (D3) and PG (D1). Load current can be monitored on the IMON turret, which has a value of 0.1V/A
determined by RMON (20k.)
NOTE: Because the LTC4234 incorporates foldback current
limiting, the nominal startup current supplied to the load
is approximately 5.7A, and may be as low as 4A. This current limit increases linearly until the FB pin exceeds 0.6V
(VOUT > 5.1V). An electronic constant current load set to
≤ 20 amps will not permit the circuit to turn on unless it
is gated on by the PG signal (as would be the case with a
DC/DC converter controlled by the PG signal). Resistive
loading will not have this problem.
+
ADJUSTABLE
POWER SUPPLY
+
+
–
–
–
TEST
LOADS
DC2116 F01
Figure 1. Proper Measurement Equipment Setup
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3
DEMO MANUAL DC2116A
dc2116a-a Quick Start Procedure
Turn on the power supply; verify the input voltage is 12V.
Verify the output voltage and the load current; D3 and D4
should both be illuminated (input voltage and output voltage, respectively) and both D1 (FLT) and D2 (PG) should be
off. On power-up, observe the slope of VOUT. This should
be in the range of 0.15 to 0.55V/ms, corresponding to a
ramp-up time of 22ms to 80ms to 12V. With the circuit
functioning, additional evaluations can now be performed.
OV/UV/PG thresholds – Set the input supply to zero and
ramp the voltage slowly, observing the following events.
Above 10.0V, the circuit will be out of UV lockout and the
output should ramp up, lighting D4. Above 10.9V the FB
pin will be past its threshold, asserting the PG pin high and
extinguishing D2. Increasing the supply past 15.2V will
engage OV lockout; D4 will extinguish and D2 will light.
Note that the voltages indicated in this step are maximums,
taking into consideration the tolerances of the resistors
and the LTC4234 thresholds.
Current Limit Thresholds – With the input supply set to
12V, load the output with a 0.59Ω power resistor capable of
dissipating 300W. Power should remain on, as the current
will be below the 20A minimum current limit threshold.
Next, load the output with a 0.48Ω power resistor. Power
should be interrupted, as the current will be above the 25A
maximum current limit threshold.
Inrush into capacitive load – One of the main functions of
a Hot Swap circuit is to provide controlled ramp-up into a
capacitive load to avoid disturbing the input power supply. For the following tests, ensure that the AUTORETRY
jumper is set to OFF and the TIMER DURATION jumper
is set to 2.0ms. To guarantee that current limit is never
reached during ramp-up into a capacitor, the current must
be less than the minimum current limit threshold of 4A
when the gate ramp rate is at its maximum value of 0.6V/
ms. (Note that the minimum current limit threshold occurs
when the FB pin is at 0V.)
C = i/(dV/dt) = 4A/(0.6V/ms) = 6667µF
Thus the circuit will always power up successfully with a
6000µF capacitor at VOUT, and observation of the TIMER
turret post will show that it never begins to ramp.
DC2116A-B Quick Start Procedure
The LTC4233, on the DC2116A-B, should be tested as
above with actual values scaled to values shown in the
data sheet.
4
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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.
A
B
C
D
INPUT
P0WER
OFF
ON
CIN
OPT
D3
GREEN
+
-B
ASS'Y
-A
2 ms
1.2 ms
20A
LTC4234
10A
CURRENT
U1
LTC4233
5
1
R1
10K
5%
0805
3
2
5
4
36
31
34
2
1
39
33
6
E16
SENSE
C1
1.0uF
16V
CUSTOMER NOTICE
R9
20K
R8
226K
C2
0.1uF
16V
R10
20K
R7
140K
VDD
INTVCC
TIMER
FLT
SENSE
SENSE-
OV
UV
VDD
VDD
VDD
U1*
4
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
APPROVALS
E19
GND
I MON
I SET
PG
GATE
FB
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
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.
M.HAWKINS
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG. R. SMITH
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
JP2
TIMER DURATION
3
2
1
FAULT
D1
RED
R4
10K
5%
0805
AUTORETRY
JP1
* ASSEMBLY OPTIONS
E21
E20
E1
E2
E17
E11
E10
E15
GND
D5
SMAJ22A
1. ALL RESISTORS ARE 0603 PACKAGE, 1% U.O.N.
NOTE:
GND
GND
INTVCC
TIMER
FLT
OV
UV
BANANA
GND
E14
BANANA
VDD
E13
1
2
E12
2
1
2
1
VDD
3
3
RMON
20K
0805
DATE:
N/A
SIZE
GATE
05/21/2013
1
SHEET
DEMO CIRCUIT 2116A
IC NO.LTC4233/LTC4234
2
IMON
ISET
PG
E7
VOUT
GND
BANANA
BANANA
1
1
OF 1
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E5
E4
E3
E8
OPT
E6
+ COUT2
GND
POWER
BAD
R6
10K
5%
0805
COUT1
22uF
25V
E9
DATE
05/21/2013
10/20 AMP INTEGRATED
HOT SWAP CONTROLLER
TECHNOLOGY
RSET
OPT
0805
E18
OPT
CGATE
OPT
D2
RED
OUTPUT
P0WER
+
VOUT
APPROVED
ROBERT SMITH
PRODUCTION
1
DESCRIPTION
REVISION HISTORY
D4
GREEN
R5
10K
5%
0805
RGATE
R3 20K
R2
150K
VOUT
1
REV
TITLE: SCHEMATIC
38
35
32
37
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
-
ECO
2
2
1
4
SENSE
8
SENSE
40
GND
7
2
1
5
A
B
C
D
DEMO MANUAL DC2116A
Schematic Diagram
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5
DEMO MANUAL DC2116A
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.
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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
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Linear Technology Corporation
LT 0815 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
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