DC2315A_Demo_Manual.PDF

DEMO MANUAL DC2315A
LTC4235-1/LTC4235-2
Dual 12V Ideal Diode-OR and Single
Hot Swap Controller with Current Monitor
DESCRIPTION
Demonstration circuit 2315A is intended to demonstrate
the performance of the LTC®4235-1/LTC4235-2 Dual 12V
Ideal Diode-OR and Single Hot Swap™ Controller with
Current Monitor. The controller operates in redundant
12V supply circuits, where each rail has an individual
ideal diode, and the outputs are connected to the load
through a single Hot Swap circuit. The controller enables
monitoring of the load current by providing a signal that
is 100× the sense resistor voltage.
The main board components are the LTC4235 controller,
two power MOSFETs functioning as ideal diodes and one
power MOSFET controlled as a Hot Swap switch, two
jumpers for enabling the second ideal diode (DIODE2_OFF)
and Hot Swap (ON_SEL), two LEDs to indicate power good
(PWRGD) and fault (FAULT) conditions, seven banana
jacks for connecting power supplies and load, and many
turrets and pads for observing circuit signals.
The DC2315A allows verification of the LTC4235 Hot Swap
and ideal diode functionality during individual rail ramp-up
and ramp-down events, during power supply switchover,
in steady state, and in overcurrent fault conditions.
VERSION
PART
OVERCURRENT FAULT
DC2315A-A
LTC4235-1
LATCHOFF
DC2315A-B
LTC4235-2
RETRY
The DC2315A is configured for 12V operation with a 9.0A
maximum current load.
PERFORMANCE SUMMARY
SYMBOL
Table 1. DC2315A Assembly Options
Design files for this circuit board are available at
http://www.linear.com/demo/DC2315A
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
14.0
V
11.1
4.3
A
A
Supplies
VIN
Input Supply Range
ILIM
Board Current Limit
VINTVCC
Internal Regulator Voltage
VINTVCC(UVL)
Internal VCC Undervoltage Lockout
9
OUT = 11V
OUT = 0V
8
2.3
9
3.3
4.5
5
5.5
V
INTVCC Rising
2.1
2.2
2.3
V
2
15
28
mV
12
14
V
–90
–120
µA
Ideal Diode Control
∆VFWD(REG)
Forward Regulation Voltage (VINn – VSENSE+)
∆VDGATE
External N-Channel Gate Drive (VDGATEn – VINn)
∆VFWD = 0.15V, I = 0, –1μA
10
ICPO(UP)
CPOn Pull-Up Current
CPO = IN = 12V
–50
IDGATE(FPU)
DGATEn Fast Pull-Up Current
∆VFWD = 0.2V, ∆VDGATE = 0V, CPO = 17V
IDGATE(FPD)
DGATEn Fast Pull-Down Current
∆VFWD = –0.2V, ∆VDGATE = 5V
IDGATE2(DN)
DGATE2 Off Pull-Down Current
D2OFF = 2V, ∆VDGATE2 = 2.5V
tON(DGATE)
DGATEn Turn-On Delay
tOFF(DGATE)
DGATEn Turn-Off Delay
tPLH(DGATE2)
D2OFF Low to DGATE2 High
–1.5
A
1.5
50
A
100
200
µA
∆VFWD =0.2V, CDGATE = 10nF
0.25
0.5
µs
∆VFWD = –0.2V, CDGATE=10nF
0.2
0.5
µs
50
100
µs
dc2315af
1
DEMO MANUAL DC2315A
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
mV
mV
Hot Swap Diode Control
∆VSENSE(TH)
Current Limit Sense Voltage Threshold
(VSENSE+ – VSENSE–)
OUT = 11V
OUT = 0V
22.5
5.8
25
8.3
27.5
10.8
VSENSE+(UVL)
SENSE+ Undervoltage Lockout
SENSE+ Rising
1.8
1.9
2
V
∆VSENSE+(HYS)
SENSE+ Undervoltage Lockout Hysteresis
10
50
90
mV
∆VHGATE
External N-Channel Gate Drive (VHGATE – VOUT)
I = 0, –1μA
10
12
14
V
∆VHGATE(H)
External N-Channel Gate High Threshold (VHGATE – VOUT)
3.6
4.2
4.8
V
IHGATE(UP)
External N-Channel Gate Pull-Up Current
Gate Drive On, HGATE = 0V
–7
–10
–13
μA
IHGATE(DN)
External N-Channel Gate Pull-Down Current
Gate Drive Off, OUT = 12V,
HGATE = OUT + 5V
1
2
4
mA
IHGATE(FPD)
External N-Channel Gate Fast Pull-Down Current
Fast Turn-Off, OUT = 12V,
HGATE = OUT + 5V
100
200
350
mA
VOUT(PGTH)
OUT Power Good Threshold
OUT Rising
10.2
10.5
10.8
V
VON(TH)
ON Pin Threshold Voltage
ON Rising
1.21
1.235
1.26
V
VON(RESET)
ON Pin Fault Reset Threshold Voltage
ON Falling
0.57
0.6
0.63
V
VD2OFF(H,TH)
D2OFF Pin High Threshold Voltage
D2OFF Rising
1.21
1.235
1.26
V
VD2OFF(L,TH)
D2OFF Pin Low Threshold Voltage
D2OFF Pin Failing
1.19
1.215
1.24
VFTMR(H)
FTMR Pin High Threshold Voltage
1.198
1.235
1.272
V
IFTMR(UP)
FTMR Pull-Up Current
FTMR = 1V, In Fault Mode
–80
–100
–120
μA
IFTMR(DN)
FTMR Pull-Down Current
FTMR = 2V, No Faults
1.3
2
2.7
μA
DRETRY
Auto-Retry Duty Cycle
0.07
0.15
0.23
%
3.6
4.1
4.6
V
99
100
15
20
Input/Output Pin
Current Monitor
∆VREG
Floating Regulator Voltage (VSENSE+ – VSENSE–)
IREG = ±1μA
VIMON(OS)
IMON Input Offset Voltage
∆VSENSE = 0V
GIMON
IMON Voltage Gain
∆VSENSE = 20mV and 5mV
VIMON(MIN)
IMON Minimum Output Voltage
∆VSENSE = 200μV
RIMON(OUT)
IMON Output Resistance
∆VSENSE = 200μV
2
±150
μV
101
V/V
40
mV
27
kΩ
dc2315af
DEMO MANUAL DC2315A
OPERATING PRINCIPLES
The LTC4235 is intended to build a combination of two
diode-OR circuits (for two rails) and a common single
Hot Swap path for inrush current limiting and overcurrent
protection.
Turrets
The LTC4235 regulates the forward voltage drop across
the ideal diode MOSFET to ensure smooth current transfer
from one supply to the other without oscillation. A fast
ideal diode MOSFET turn-on reduces the load voltage
droop during supply switchover. If the input supply fails
or is shorted, a fast turn-off minimizes reverse current
transients.
D2OFF (E20): Enable ideal diode 2.
The Hot Swap fast acting current limit and internal timed
circuit breaker protect circuit components when a shortcircuit fault occurs.
JP1 (ON_SEL): ON control signal selection.
The Hot Swap section of the LTC4235 has independent
on/off control (ON pin).
ON (E18): On control input.
EN (E19): Enable input.
PWRGD (E9): Power status output.
FAULT (E10): Fault status output.
CMON (E11): Current sense monitoring output.
Jumpers
JP2 (EN_SEL): Enable signal selection.
JP3 (DIODE2_OFF): Diode 2 Off-On control.
JP4 (PPRI_SEL): Prioritizer function selection.
Each ideal diode MOSFET is activated from an individual
charge pump source and the second ideal diode has an
additional on/off control (D2OFF pin).
LEDs
The DC2315A-A (LTC4235-1) features a latchoff circuit
breaker, while the DC2315A-B (LTC4235-2) provides
automatic retry after a fault.
D4: Indicates fault signal.
D3: Indicates power good signal.
Banana Jacks with Associated Turrets
IN1 (E1, E2): First rail input.
IN2 (E5, E6): Second rail input.
GND (E3, E4, E7, E8, E14, E15, E21, E22): Power and
control ground.
SENSE+ (E16, E17): SENSE+ power node.
OUT (E12, E13): Circuit output for load connection.
dc2315af
3
DEMO MANUAL DC2315A
QUICK START PROCEDURE
Demonstration circuit 2315A is easy to set up to evaluate the performance of the LTC4235. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below.
The DC2315A test includes independent test of the LTC4235
Hot Swap functionality and ideal diode functionality.
HOT SWAP FUNCTIONALITY TEST
This test is performed with a single rail operation when the
output is provided through two series connected MOSFETs.
One MOSFET functions as an ideal diode and the other as
a Hot Swap circuit switch.
The parameters of the three different transients completely
characterize the Hot Swap circuit performance. These
transients are:
n
A Power-Up Without Any Additional Load
n
A Current Limit Operation After Successful Power-Up
n
A Power-Up With Shorted Output
1.Initially, install the jumpers in the following positions,
if the first ideal diode is used in the test:
JP1: ON_SEL in the position OFF
JP2: EN_SEL in the position EN
JP3: DIODE2_OFF in the position OFF_EXT
If the second ideal diode is used:
JP1: ON_SEL in the position OFF
JP2: EN_SEL in the position EN
JP3: DIODE2_OFF in the position ON
Connect a +12V power supply to turrets IN1 and GND.
Do not load the output. Place the current probe on the
+12V wire, voltage probes on the OUT turret and a
voltmeter on the CMON and GND turrets.
4
Provide an ON signal at the ON pin by changing the JP1
header position from the OFF position to 12V. Observe
the transient. The output voltage rise time should be in
the range of 8.9ms – 19.7ms. The PWRGD green LED
D3 must light. The voltmeter at the CMON turret should
display an absolute value not larger than 15mV. Turn
off the rail using the ON_SEL jumper.
2.Connect a disabled electronic load to the OUT turret
and GND. Turn on the rail and slowly increase the
load current up to the circuit breaker threshold level.
The current limit range should be from 8.0A to 11.1A.
The voltage at the CMON turret should be in the range
from 2.22V to 2.77V. Turn off the rail with the ON_SEL
jumper.
3.Initially short the output with an external wire. Place the
current probe on this wire. Turn on the rail and record
the current shape. The maximum current should be in
the 2.3A to 4.3A range, and the voltage at the CMON
turret should be in the range from 0.57V to 1.09V.
IDEAL DIODE FUNCTIONALITY TEST
In this test, both ideal diodes are active and small variations in the input voltage forces one ideal diode to be off
and the other ideal diode to be on.
Connect input turrets (IN1 and IN2) of each ideal diode
with independent lab supplies. Adjust each input voltage
to +12V with maximum possible accuracy. Place one
voltmeter between IN1 and IN2 turrets to measure the
difference between the two input voltages. Connect an
electronic load to the output turret. Activate both rail and
keep a load around 9A. Play with the input voltage levels
and check that when the difference between input voltages
exceeds 28mV, only one rail feeds the load.
dc2315af
DEMO MANUAL DC2315A
QUICK START PROCEDURE
Figure 1. Proper Measurement Equipment Setup
dc2315af
5
DEMO MANUAL DC2315A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
8
C1, C2, C6, C7, C8, C9, C13, C14
CAP., 0.1μF, X7R, 50V, 10%, 0603
TDK, C1608X7R1H104K
2
0
C3, C4
CAP., 100μF, ALUM. ELECT., 50V, 20%, SMT (OPTIONAL) SUNCON, 50CE100BS
3
1
C5
CAP., 100μF, ALUM. ELECT., 50V, 20%, SMT
4
1
C10
CAP., 0.01μF, X7R, 50V, 10%, 0603
AVX, 06035C103KAT2A
5
2
C11, C15
CAP., 0.1μF, X7R, 16V,10%, 0603
AVX, 0603YC104KAT2A
6
1
C12
CAP., 0.47μF, X7R, 16V, 10%, 0603
TDK, C1608X7R1C474K
SUNCON, 50CE100BS
7
2
D1,D2
DIODE, TVS, 17V, SMA
DIODES INC., SMAJ17A-13-F
8
1
D3
LED,GREEN, WATERCLEAR, 3×2mm
ROHM, SML-010FTT86
9
1
D4
LED,RED, WATERCLEAR, 3×2mm
ROHM, SML-010VTT86
10
7
E1, E3, E5, E7, E12, E14, E16
BANANA JACK, NON-INSULATED
KEYSTONE, 575-4
11
8
E2, E4, E6, E8, E13, E15, E17, E21 TEST POINT, TURRET, 0.094" MTG. HOLE
MILL-MAX, 2501-2-00-80-00-00-07-0
12
7
E9, E10, E11, E18, E19, E20, E22
TEST POINT, TURRET, 0.064" MTG. HOLE
MILL-MAX, 2308-2-00-80-00-00-07-0
13
2
JP1, JP4
CONN,, HEADER, 2×2, 2mm, THRU-HOLE, VERTICAL SAMTEC, TMM-102-02-L-D
14
2
JP2, JP3
CONN., HEADER, 1×3, 2mm, THRU-HOLE, VERTICAL SAMTEC, TMM-103-02-L-S
15
4
MP1, MP2, MP3, MP4
STANDOFF, NYLON 0.5"
KEYSTONE, 8833 (SNAP ON)
16
3
Q1, Q2, Q3
MOSFET, N-CH 30V 60A METAL OXIDE, PPAK
VISHAY, SIR158DP-T1-GE3
17
1
RS1
RES., 0.0025Ω, METAL ELEMENT, 1%, 1/2W 2010
VISHAY, WSL20102L500FEA
18
2
R1, R2
RES., 100Ω, 1/10W, 1%, 0603
YAGEO, RC0603FR-07100RL
19
2
R3, R9
RES., 1k, 1/10W, 1%, 0603
YAGEO, RC0603JR-071KL
20
1
R4
RES., 10Ω, 1/10W, 1%, 0603
YAGEO, RC0603FR-0710RL
21
1
R5
RES., 2k, 1/10W, 1%, 0603
YAGEO, RC0603FR-072KL
22
1
R6
RES., 13.7k, 1/10W, 1%, 0603
YAGEO, RC0603FR-0713K7L
23
2
R7, R8
RES., 3.0k, 1/8W, 1%, 0805
VISHAY, CRCW08053K00FKEA
24
1
R10
RES., 2.49k, 1/10W, 1%, 0603
YAGEO, RC0603FR-072K49L
25
1
R11
RES., 21k, 1/10W, 1%, 0603
VISHAY, CRCW060321K0FKEA
26
4
XJP1, XJP2, XJP3, XJP4
SHUNT, 2mm
SAMTEC, 2SN-BK-G
1
U1
IC, IDEAL DIODE & Hot Swap CONTROLLER, QFN
LINEAR TECH., LTC4235IUFD-1
1
U1
IC, IDEAL DIODE & Hot Swap CONTROLLER, QFN
LINEAR TECH., LTC4235IUFD-2
DC2315A-A
1
DC2315A-B
1
6
dc2315af
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
D2OFF
IN1
EN
ON
GND
GND
IN2
IN2
SENSE+
SENSE+
IN1
E1
1
3
4
3
E20
2
1
5
NC
VIN1
JP1
4
R10
2.49k
R11
21k
OFF
12V
C4
100uF
50V
OPT
2
+
ON_SEL
PPRI_SEL
JP4
E19
E18
SENSE+
E8
E7
E6
9V-14V
E5
E17
E16
E2
9V-14V
2
1
1
2
C14
0.1uF
50V
1
3
2
C2
0.1uF
50V
R5
2k
EN_SEL
DIS_EXT
EN
JP2
R6
13.7k
D2
SMAJ17A
R2
100
INTVCC
4
C6
0.1uF
50V
C13
0.1uF
50V
TP9
CPO1
TP2
C7
0.1uF
50V
IN1
10
5
21
14
4
EN
GND
EP
ON
INTVcc
TP3
C8
0.1uF
50V
DG1
TP1
5
Q1
SiR158DP
4
2
1
1
2
IN1
3
2
1
19
CPO1
R1
100
3
IN1
D
CPO2
1
3
2
3
2
1
OFF_EXT
ON
GND
PROBE GND
U1 *
C9
0.1uF
50V
TP5
DG2
5
TP4
Q2
SiR158DP
LTC4235-1
DIODE2_OFF
JP3
6
IN2
C1
0.1uF
50V
8
CPO2
D1
SMAJ17A
7
DGATE2
4
12
REG
C3
100uF
50V
OPT
SENSE+
E22
E21
3
REG
1
SENSE-
E4
2
SENSE+
GND
C11
0.1uF
16V
TP7
C15
0.1uF
16V
FTMR
HG
TP6
TP8
IMON
C10
0.01uF
50V
R3
1k
R4
10
CUSTOMER NOTICE
11
9
15
5
3
2
1
Q3 SiR158DP
R9
1k
GREEN
D3
R7
3.0k
0805
APPROVALS
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
E11
E10
E9
STANDOFF, NYLON 0.5"
STANDOFF, NYLON 0.5"
MP3
MP4
STANDOFF, NYLON 0.5"
PCB1 PCB FAB, DC2315A REV01
STANDOFF, NYLON 0.5"
MP2
PCA ADDITIONAL PARTS
MP1
SIZE: N/A SCALE = NONE
Friday, September 11, 2015
1
SHEET
1
OF
710-DC2315A_REV01
SCHEMATIC NO. AND REVISION:
1
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: DEMO CIRCUIT SCHEMATIC,
CMON
FAULT
PWRGD
LTC4235-2
DC2315A-B
U1
LTC4235-1
SKU#
DC2315A-A
DATE:
2
GND
GND
USE TABLE BELOW FOR ALTERNATE U1.
DC2315A-A
SKU NO.
E15
E14
OUT
ADJ., 9A
OUT
DUAL IDEAL DIODE AND SINGLE HOT SWAP CONTROLLER
WITH CURRENT MONITOR
C12
0.47uF
16V
RED
D4
R8
3.0k
0805
SENSE+
C5
100uF
50V
E13
E12
1
SCHEMATIC DEPICTS U1 USED ON SKU# DC2315A-A.
*
+
PCA BOM: 700-DC2315A-A_REV02
PCA ASS'Y: 705-DC2315A_REV01
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
PCB DES.
M.HAWKINS
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO APP ENG. V.OSTREROV
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
IC NO.
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
LTC4235-1
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
IMON
FTMR
FAULT
PWRGD
16
RS1 0.0025
17
OUT
E3
18
HGATE
4
3
2
1
GND
4
20
DGATE1
D2OFF
13
2
1
1
2
+
5
A
B
C
D
DEMO MANUAL DC2315A
SCHEMATIC DIAGRAM
dc2315af
7
DEMO MANUAL DC2315A
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
8
dc2315af
Linear Technology Corporation
LT 0915 • 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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