DC1052A - Demo Manual

DEMO MANUAL DC1052A
LTC4218
Hot Swap Controller
Description
Demonstration circuit DC1052A includes two separate
circuits for performance evaluation of the LTC®4218 Hot
Swap™ controller. The standard version of the controller (LTC4218) is intended to operate with 2.9V to 26.5V
rails, while the LTC4218-12 has internal adjustment for
12V applications.
One circuit of DC1052A located on the upper board area
is assembled with the LTC4218 configured for operation
with a 24V rail. The circuit on the lower board area includes
the LTC4218-12. Circuit breaker thresholds in both cases
are adjusted to 7.5A.
The LTC4218 features accurate current limiting with foldback and a ground-referred current monitor. The current
monitor sources a current that is proportional to the sense
Performance Summary
SYMBOL
voltage, and it may be converted into a voltage signal with
an appropriate resistor.
The current limit may be reduced by placing an external
resistor between GND and the ISET pin.
The LTC4218 protects the load from overvoltage and
undervoltage conditions.
The DC1052A schematic allows the LTC4218 to operate in
turn-on and turn-off modes as well as in the steady-state
mode with different loads, and in the fault state.
Design files for this circuit board are available at
http://www.linear.com/demo
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
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VDD
Input Supply Range
Typical Value
19.89
24
26.34
V
VDD(UVL)
Input Supply Undervoltage Range
VDD Rising
19.32
19.89
20.68
V
VDD(OVH)
Input Supply Overvoltage Range
VDD Rising
25.56
26.34
27.39
V
VOUT(PG)
Output Voltage Defined as Power Good
VSOURCE Rising
20.00
20.75
21.57
V
0.9
1.235
1.76
ms
7.05
1.38
7.5
1.88
7.95
2.37
A
A
24V Circuit
tTIMER
Timer Period
ILIMIT
Current Limit
VFB = 1.23V (VOUT in the Range 20.33V to 21.16V)
VFB = 0V to 0.15V (VOUT in the Range 0V to 2.6V)
CMAX24
Maximal Load Capacitance
Successful Power-Up Mode
600
μF
CMIN24
Minimal Load Capacitance
Unsuccessful Power-Up Mode
1800
μF
VDD
Input Supply Range
Typical Value
9.88
12
15.05
V
VDD(UVL)
Input Supply Undervoltage Range
VDD Rising
9.6
9.88
10.2
V
12V Circuit
VDD(OVH)
Input Supply Overvoltage Range
VDD Rising
14.7
15.05
15.4
V
VOUT(PG)
Output Voltage Defined as Power Good
VSOURCE Rising
10.2
10.5
10.8
V
0.9
1.235
1.76
ms
7.05
1.38
7.5
1.88
7.95
2.37
A
A
tTIMER
Timer Period
ILIMIT
Current Limit
VFB = 1.23V (VOUT in the Range 10.3V to 10.4V)
VFB = 0V to 0.15V (VOUT in the Range 0V to 1.27V)
CMAX12
Maximal Load Capacitance
Successful Power-Up Mode
900
μF
CMIN12
Minimal Load Capacitance
Unsuccessful Power-Up Mode
1800
μF
dc1052af
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DEMO MANUAL DC1052A
Operating Principles
The LTC4218 is suited for low voltage power control in
applications for hot board insertion or removal with electronic circuit breaker function, foldback current limit and
load current monitoring. The LTC4218 has a rich set of
features to support Hot Swap applications, including:
• Adjustable inrush current control
• 2% accurate undervoltage and overvoltage protection
• Power good and fault signaling
• Load current monitoring
• Adjustable current limit timer before power is turned
off
• Adjustable 5% accurate current limit
Quick Start Procedure
Demonstration circuit 1052A is easy to set up to evaluate
the performance of the LTC4218 and LTC4218-12. Refer
to Figure 1 for the proper measurement equipment setup
and follow the procedure below.
For the 12V circuit:
JP3 FAULT
Signal
For the 24V circuit:
JP4 AUX_UV
ON
1. Place jumpers in the following positions:
7. With power off, connect the 12V power supply terminals
to the 12VIN (E9) and GND (E12) turrets.
JP1 FAULT
Signal
JP2 AUX_UV
ON
2. With power off, connect the 24V power supply terminals
to the 24VIN (E1) and GND (E4) turrets.
3. Turn on the 24V supply and verify the output voltage
between the VOUT (E2) and GND (E3) turrets. Green
LEDs 24VIN (D2) and VOUT (D4) should light up.
4. Check the current limit by providing an electronic or
resistive load. It should be in the range of 7.05A to
7.95A. During this measurement, verify the current
monitor performance. The monitor signal related to
the current limit level should be 2.0V ± 0.17V. The
monitor signal has a 3.75A/V scale.
5. Use an oscilloscope to check the output voltage slew
rate without a load connected. It should be in the range
of 1680V/s to 2300V/s. Use an 1800μF capacitive load
to confirm that during power-up, the timer period
expires and a current limit fault is indicated by the
FAULT red LED (D5). The PG red LED (D6) indicates
that the output voltage is lower than the power good
level.
6. Place jumpers in the following positions:
8. Turn on the 12V supply and verify the output voltage
at the VOUT (E10) and GND (E11) turrets. Green LEDs
12VIN (D9) and VOUT (D11) should light up.
9. Check the current limit by providing an electronic or
resistive load. It should be in the range of 7.05A to
7.95A. During this measurement verify the current
monitor performance. The monitor signal related to
the current limit level should be 2.0V ± 0.17V. The
monitor signal has a 3.75A/V scale.
10.Check the output voltage slew rate with an oscilloscope
without a load connected. It should be in the range of
1680V/s to 2300V/s.
11. Use an 1800µF capacitive load to confirm that during
power-up the timer period expires and a current limit
fault is indicated by the FAULT red LED (D12) accompanied by the PG red LED (D13) to indicate that the
output voltage is lower than the power good level.
dc1052af
2
DEMO MANUAL DC1052A
Quick Start Procedure
Figure 1. Proper Measurement Equipment Setup
dc1052af
3
DEMO MANUAL DC1052A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
4
C1, C2, C4, C6
CAP., CER X7R 0.1µF 16V 0603
AVX 0603YC104KAT2A
2
2
C3, C5
CAP., CER X7R 0.01µF 50V 0603
AVX 06035C103KAT2A
3
0
COUT1, COUT2
OPTIONAL
4
0
CIN1, CIN2
OPTIONAL
5
8
E5-E8, E13-E16
TURRET, TEST PIN, .061"
MILL-MAX 2308-2-00-44
6
8
E1-E4, E9-E12
TURRET, TEST PIN, .095"
MILL-MAX 2501-2
7
4
JP1-JP4
JUMPER, 0.079, 3 PIN
SAMTEC, TMM-103-02-L-S
8
4
JP1-JP4
SHUNT,
SAMTEC, 2SN-BK-G
9
4
D5, D6, D12, D13
LED, SMT RED
PANASONIC, LN1251C
10
4
D2, D4, D9, D11
LED, SMT GREEN
PANASONIC, LN1351C
11
1
D1
DIODE, 600W TRANSIENT VOLTAGE SUPPRESSOR
DIODES INC., SMBJ24A
12
1
D8
DIODE, 600W TRANSIENT VOLTAGE SUPPRESSOR
DIODES INC., SMBJ12A
13
0
D3, D10, D17, D14
OPTIONAL
SMA
14
2
Q1, Q2
MOSFET N-CHANNEL 30V, POWER PAK-SO-8
VISHAY, Si7880ADP
15
2
R1, R13
RES., CHIP, 0.002Ω 1/4W 1% 1206
VISHAY, WSL12062L000FEA
16
2
R8, R18
RES., CHIP, 10Ω 1/16W 5% 0603
VISHAY, CRCW060310R0JNEA
17
2
R11, R19
RES., CHIP, 1k 1/16W 5% 0603
VISHAY, CRCW06031K00JNEA
18
1
R10
RES., CHIP, 3.24k 1/16W 1% 0603
Vishay, CRCW06033K24FKEA
19
4
R14-R17
RES., CHIP, 3.30k 1/16W 5% 0603
VISHAY, CRCW06033K30JNEA
20
4
R2, R4, R5, R6
RES., CHIP, 6.80k 1/4W 5% 1206
VISHAY, CRCW12066K80JNEA
21
2
R9, R12
RES., CHIP, 10k 1/16W 1% 0603
VISHAY, CRCW060310K0FKEA
22
2
RMON1, RMON2
RES., CHIP, 20k 1/16W 5% 0805
VISHAY, CRCW080520K0JNEA
23
1
R7
RES., CHIP, 158k 1/16W 1% 0603
VISHAY, CRCW0603158KFKEA
24
1
R3
RES., CHIP, 200k 1/16W 1% 0603
VISHAY, CRCW0603200KFKEA
25
0
RSET1, RSET2
OPTIONAL
26
1
U1
IC., HOT SWAP CONTROLLER
LINEAR, LTC4218CGN
27
1
U2
IC., HOT SWAP CONTROLLER
LINEAR, LTC4218CDHC-12
dc1052af
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.
D
C
B
GND
1
2
E9
E4
1
2
2
Future Use
DC1052A-B
1
U1
LTC4218CGN
DC1052A-A
+ CIN2
(Opt.)
JP2
D9
LED
(GRN)
R14
3.3K
OFF
ON
1
2
3
+ CIN1
(Opt.)
AUX_UV
D2
LED
(GRN)
R2
6.8K
1206
ASSEMBLY
Table
E12
D8
SMBJ12A
12VIN
GND
D1
SMBJ24A
1
2
C2
0.1uF
16V
C1
0.1uF
16V
8
7
6
5
4
3
2
1
GATE
PG
FAULT
FB
IMON
ISET
SENSE-
SENSE+
SOURCE
GND
INTVCC
TIMER
OV
UV
VDD
NC
U1
LTC4218CGN
9
10
11
12
13
14
15
16
8
7
6
5
4
GATE
PG
FAULT
FB
IMON
ISET
SENSE-
SENSE+
SOURCE
GND
INTVCC
TIMER
OV
UV
VDD
NC
9
10
11
12
13
14
15
16
Future Use
LTC4218CDHC-12
U2
3
POSITIVE 12V HOT SWAP
C6
0.1uF
16V
C4
0.1uF
16V
3
2
1
U2
LTC4218CDHC-12
R13
.002
POSITIVE 24V HOT SWAP
R12
10K
1%
R10
3.24K
1%
R3
200K
1%
4
RMON2
20K
1%
RSET2
(Opt.)
RMON1
20K
1%
RSET1
(Opt.)
1
3
2
1
3
2
1
JP1
JP3
8
7
6
5
R18
10
R8
10
1
JP4
ON
AUX_UV
3
OFF
2
D13
LED
(RED)
PG
R17
3.3K
D6
LED
(RED)
PG
R6
6.8K
1206
8
7
6
5
3
2
1
3
2
1
6
D14
(Opt.)
5
6
E8
E7
E6
E5
C3
0.01uF
R11
1K
D3
(Opt.)
COUT1
(Opt.)
D10
(Opt.)
COUT2
(Opt.)
ISET
IMON
PG
FAULT Output
ISET
IMON
PG
FAULT Output
R9
10K
1%
R7
158K
1%
7
E2
GND
24V/7.5A
VOUT
E10
E11
D11
LED
(GRN)
R15
3.3K
7
Tuesday, February 05, 2008
1
Demo Circuit 1052A-A/B
LTC4218CGN, LTC4218CDHC-12
Positive 24V, Positive 12V Hot Swap
1630 McCARTHY BLVD.
MILPITAS, CA. 95035
PHONE (408) 954-8400 FAX (408) 434-0507
8
1
GND
12V/7.5A
VOUT
SUM110MO3-03P
Alternate Part For Q1
E3
D4
LED
(GRN)
R4
6.8K
1206
8
LINEAR TECHNOLOGY CORPORATION
E16
E15
E14
E13
C5
0.01uF
R19
1K
Q2
Si7880ADP
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.
This Circuit Is Proprietary To Linear Technology And
Supplied For Use With Linear Technology Parts.
Customer Notice
D7
(Opt.)
Q1
Si7880ADP
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
Auto-Retry
Signal
FAULT
5
Auto-Retry
Signal
FAULT
FAULT
D5
LED
(RED)
R5
6.8K
1206
D12
LED
(RED)
FAULT
R16
3.3K
2
A
1
2
1
2
E1
R1
.002
4
1
2
4
4
3
1
2
2
1
1
2
24VIN
2
2
1
1
2
1
2
1
2
1
D
C
B
A
DEMO MANUAL DC1052A
Schematic Diagram
dc1052af
5
DEMO MANUAL DC1052A
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
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ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
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appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
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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
dc1052af
6
Linear Technology Corporation
LT 0513 • PRINTED IN USA
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●
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