DC2314A - Demo Manual

DEMO MANUAL DC2314A
LTC4236-1/LTC4236-2
Dual Ideal Diode-OR and Single Hot
Swap Controller with Current Monitor
DESCRIPTION
Demonstration circuit 2314A is intended to demonstrate
the performance of the LTC4236-1/LTC4236-2 Dual Ideal
Diode-OR and Single Hot Swap Controller with Current
Monitor. The controller operates in redundant 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 LTC4236 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 and Hot Swap, four
LEDs to indicate the power good state, fault condition, and
the state of the MOSFETs operating as ideal diodes, seven
banana jacks for connecting power supplies and loads,
and many turrets and pads for observing circuit signals.
The DC2314A allows verification of the LTC4236 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
DC2314A-A
LTC4236-1
LATCHOFF
DC2314A-B
LTC4236-2
RETRY
The DC2314A is configured for 12V operation with a 10A
current load.
Table 1. DC2314A Assembly Options
Design files for this circuit board are available at
http://www.linear.com/demo/DC2314A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
BOARD AND CONTROLLER PERFORMANCE SUMMARY Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
OUT = 11V
18.0
V
8.91
10
11.11
A
4.5
5
5.5
V
INTVCC Rising
2.1
2.2
2.3
V
Supplies
VIN
Input Supply Range
ILIM
Board Current Limit
VINTVCC
Internal Regulator Voltage
VINTVCC(UVL)
Internal VCC Undervoltage Lockout
2.9
Ideal Diode Control
ΔVFWD(REG)
Forward Regulation Voltage (VINN – VSENSE)
2
15
28
mV
ΔVDGATE
External N-Channel Gate Drive
(VDGATE1 – VIN1) and (VDGATE2 – VD2SRC)
IN < 7V, ΔVFWD = 0.15V; I = 0, –1µA
IN = 7V to 18V, ΔVFWD = 0.15V; I = 0, –1μA
5
10
7
12
14
14
V
V
ICPO(UP)
CPOn Pull-Up Current
CPO = IN = D2SRC = 2.9V
CPO = IN = D2SRC = 18V
–60
–50
–100
–90
–130
–120
µA
µA
IDGATE(FPU)
DGATEn Fast Pull-Up Current
ΔVFWD = 0.2V, ΔVDGATE = 0V, CPO = 17V
–1.5
A
IDGATE(FPD)
DGATEn Fast Pull-Down Current
ΔVFWD = –0.2V, ΔVDGATE = 5V
1.5
A
IDGATE2(DN)
DGATE2 Off Pull-Down Current
D2OFF = 2V, ΔVDGATE2 = 2.5V
tON(DGATE)
DGATEn Turn-On Delay
tOFF(DGATE)
DGATEn Turn-Off Delay
tPLH(DGATE2)
D2OFF Low to DGATE2 High
50
100
200
µA
ΔVFWD = 0.2V, CDGATE = 10nF
0.25
0.5
µs
ΔVFWD = –0.2V, CDGATE = 10nF
0.2
0.5
µs
50
100
µs
dc2314af
1
DEMO MANUAL DC2314A
BOARD AND CONTROLLER PERFORMANCE SUMMARY Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
27.5
10.8
mV
mV
Hot Swap Diode Control
ΔVSENSE(TH)
Current Limit Sense Voltage Threshold
(VSENSE+ – VSENSE–)
FB = 1.3V
FB = 0V
22.5
5.8
25
8.3
VSENSE+(UVL)
SENSE+ Undervoltage Lockout
SENSE+ Rising
1.8
1.9
2
V
ΔVSENSE+(HYS)
SENSE+ Undervoltage Lockout Hysteresis
10
50
90
mV
ΔVHGATE
External N-Channel Gate Drive (VHGATE – VOUT) IN < 7V, I = 0, –1μA
IN = 7V to 18V, I = 0, –1μA
5
10
7
12
14
14
V
V
ΔVHGATE(H)
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
VIN(TH)
ON, FB Pin Threshold Voltage
Voltage 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
D2OFF Rising
1.21
1.235
1.26
V
VTMR(H)
FTMR, DTMR Pin High Threshold
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
100
101
V/V
5.5
2.9
V
V
27
kΩ
Input/Output Pin
Current Monitor
GIMON
IMON Voltage Gain
ΔVSENSE = 20mV and 5mV
99
VIMON(MAX)
IMON Maximum Output Voltage
ΔVSENSE = 70mV, 5V ≤ SENSE+ ≤ 18V
ΔVSENSE = 35mV, SENSE+ = 2.9V
3.5
2.7
RIMON(OUT)
IMON Output Resistance
ΔVSENSE = 200μV
15
2
20
dc2314af
DEMO MANUAL DC2314A
OPERATING PRINCIPLES
The LTC4236 is intended to build a combination of a diodeOR circuit for two rails and a common single Hot Swap
path for inrush current limiting and overcurrent protection.
The LTC4236 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.
The Hot Swap fast acting current limit and internal timed
circuit breaker protect circuit components when a shortcircuit fault occurs.
The Hot Swap section of the LTC4236 has independent
on/off control (ON pin).
Each ideal diode MOSFET is activated from an individual
charge pump source, and the second one has an additional
on/off control (D2OFF pin).
The LTC4236 features an adjustable debounce time — the
delay time between events when the controller is enabled
and when it starts up.
The DC2314A-A (LTC4236-1) circuit features a latchoff
circuit breaker, and DC2314A-B (LTC4236-2) provides
automatic retry after a fault.
dc2314af
3
DEMO MANUAL DC2314A
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, E26): SENSE+ power node.
OUT (E12, E13): Circuit output for load connection.
TURRETS
ON (E18): Hot Swap ON control input.
EN (E19): Enable input.
D2OFF (E20): Enable ideal diode 2.
PWRGD (E9): Power status output.
FAULT (E10): Fault status output.
CMON (E11): Current sense monitoring output.
JUMPERS
JP1 (ON_SEL): Hot Swap ON control signal selection.
JP2 (EN_SEL): ENABLE signal selection.
JP3 (DIODE2_OFF): Diode 2 OFF-ON control.
JP4 (PPRI_SEL): Prioritizer function selection.
JP5 (FB_SEL): Foldback circuit selection.
JP6 (DEBOUNCE): Debounce time selection.
JP8 (DSTAT2_SEL): DSTAT2 pin functionality selection.
JP9 (D2OFF_SEL): D2OFF control in the prioritizer mode.
LEDS
D3: Indicates PWRGD pin signal.
D4: Indicates FAULT pin signal.
D5: Indicates DSTAT1 pin signal.
D6: Indicates DSTAT2 pin signal.
4
dc2314af
DEMO MANUAL DC2314A
QUICK START PROCEDURE
Demonstration circuit 2314A is easy to set up to evaluate LTC4236. Refer to Figure 1 for proper measurement
equipment setup and follow the procedure below:
The DC2314A test includes independent test of the LTC4236
Hot Swap functionality and ideal diode functionality.
HOT SWAP FUNCTIONALITY TEST
This test is performed with singe rail operation when the
output is provided through two series connected MOSFETs.
One MOSFET functions as an ideal diode and the other
one as a Hot Swap circuit switch.
The parameters of four different transients completely
characterize the Hot Swap circuit performance. These
transients are:
A Power-Up Without Any Additional Load
A Current Limit Operation After Successful Power-Up
A Power-Up With Shorted Output
A Power-Up With Pure Capacitive Load For Confirming
Foldback Current Limiting
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 (or IN2)
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.
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 8.3ms – 19.7ms. The PWRGD green LED
D3 must light up. 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 8.91A to 11.11A.
The voltage at the CMON turret should be in the range
from 2.18V to 2.83V. 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 2.30A to 4.36A range, and the voltage at the CMON
turret should be in the range from 0.57V to 1.09V.
4. With no rail voltages and JP1 in the OFF position, connect
a 1000μF capacitor to the board output. Place a scope
current probe on any wire between the board and the
1000μF capacitor, and a voltage probe at the output.
Provide +12V to any input (IN1 or IN2) and enable the
ON signal. Confirm that current limit is characterized
by a foldback functionality.
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 individual 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 rails and
keep the load around 1A to 3A. Play with the input voltage
levels and be sure that when the difference between input
voltages exceeds 28mV, only one rail feeds the load.
dc2314af
5
DEMO MANUAL DC2314A
QUICK START PROCEDURE
–
POWER
SUPPLY 1
+
LOAD
SWITCH
+
POWER
SUPPLY 2
–
Figure 1. Measurement Equipment Setup
6
dc2314af
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
E16
IN1
6
8
5
7
JP4
E19
E22
E21
6
3
5
E20
2
4
1
+
5
OFF
R23 56.2k
C4
100uF
50V
OPT
R22 28.7k
OFF
12V
5V
3.3V
5V
3.3V
4
E18
2
3
PPRI_SEL
D2OFF
IN1
EN
PROBE GND
GND
JP1
E8
ON_SEL
E7
IN2
E6
E26
E2
1
GND
ON
SENSE+
GND
2.9V - 18V
IN2
E5
SENSE+
SENSE+
2.9V - 18V
IN1
E1
2
1
1
2
D
R10
2.2k
TP2
C2
0.1uF
50V
R2
100
TP9
C7
0.1uF
50V
IN1
1
JP3
3
2
1
4
C6
0.1uF
50V
DIODE2_OFF
3
2
OFF-EXT
ON
C14
0.1uF
50V
JP2
EN_SEL
3
2
1
INTVCC
C13
0.1uF
50V
INTVCC
R5
2k
1%
R6
13.7k
1%
DIS_EXT
EN
R20
4.64k
1%
CPO1
D2OFF_SEL
R11
20k
R21
2.21k
1%
D2
SMAJ17A
R1
100
4
2
1
1
2
OPT
D2SRC
5
TP4
INTVcc
EN
GND
EP
ON
3
2
1
TP10
TP3
C8
DTMR
TP12
STANDOFF,NYLON,SNAP-ON,0.50"
STANDOFF,NYLON,SNAP-ON,0.50"
MP3
LABEL,DEMO BOARD SERIAL NUMBER
MP4 STANDOFF,NYLON,SNAP-ON,0.50"
PCB, DC2314A REV01
PCB1
STANDOFF,NYLON,SNAP-ON,0.50"
MP2
LB1
5
15
U1 *
REG
TP5
C9
0.1uF
50V
SENSE+
C15
0.1uF
16V
INTVCC
3
2
1
3
RS1
0.0025
1/2W
25
14
20
21
22
23
24
C11
0.1uF
16V
TP7
FB
FTMR
R19
2k
1%
TP8
IMON
8
6
3
7
5V
4
1
5
2
SENSE+
R9 1k
R14
1k
1%
VCC
3.3V
2 12V
JP5
FB_SEL
C10
0.01uF
50V
R3
1k
R4
10
3
2
1
CUSTOMER NOTICE
IMON
DSTAT2
DSTAT1
FAULT
PWRGD
FB
TP11
HG
INTVCC
TP6
5
Q3
SiR158DP
4
E11
R15
4.87k
1%
APPROVALS
C12
0.47uF
16V
R17
2.37k
1%
D3
GREEN
PWRGD
R7
3.0k
0805
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
SIZE: 11X17
1
DSTAT2
DSTAT1
FAULT
PWRGD
D2OFF_SEL
3
2
1
3
2
JP8
PULL-UP
D2OFF
DSTAT2_SEL
JP7
E24
E23
E10
E9
GND
GND
OUT
OUT
ADJ., 9A
R_GND
DSTAT2
D2OFF_SEL
E15
E14
E13
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
LTC4236-2
DC2314A-B
U1
LTC4236-1
DC2314A-A
SKU #
ASSEMBLY TABLE
THIS SCHEMATIC DEPICTS U1 USAGE FOR DC2314A-A.
SEE ASSEMBLY TABLE BELOW FOR ALTERNATE U1
USED ON DIFFERENT ASSEMBLY VARIANT SKU#.
* NOTES:
D6
GREEN
D2_ON
R13
3.0k
0805
C5
100uF
50V
E12
TITLE: DEMO CIRCUIT SCHEMATIC,
D5
GREEN
D1_ON
R12
3.0k
0805
+
1
1
SHEET
1
OF
710-DC2314A_REV 01
SCHEMATIC NO. AND REVISION:
DATE: Tuesday, October 27, 2015
PCA BOM: 700-DC2314A-A_REV01
PCA ASS'Y: 705-DC2314A_REV01
1
DUAL IDEAL DIODE-OR AND SINGLE HOT SWAP CONTROLLER
WITH CURRENT MONITOR
CMON
R16
15k
1%
D4
RED
FAULT
R8
3.0k
0805
SCALE = NONE
DC2314A-A
SKU NO.
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
IC NO.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
LTC4236-1
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
100ms
ADJ.
DEBOUNCE
JP6
LTC4236-UFD-1
0.1uF
50V
CPO2
DG2
3
2
1
Q2 SiR158DP
PCA ADDITIONAL PARTS
13
6
29
19
5
R18 0
Q4 SiR158DP
DG1
MP1
TP1
5
Q1
SiR158DP
4
4
4
C1
0.1uF
50V
27
CPO1
D1
SMAJ17A
IN2
C3
100uF
50V
OPT
8
D2SRC
E4
9
DGATE2
GND
2
REG
2
1
GND
CS+
2
1
1
2
3
3
SENSE+
2
1
4
28
IN1
NC
16
7
DGATE1
NC
17
10
CPO2
D2OFF
18
1
SENSE-
5
12
DTMR
11
26
HGATE
FTMR
OUT
2
1
+
E3
A
B
C
D
DEMO MANUAL DC2314A
SCHEMATIC DIAGRAM
dc2314af
7
DEMO MANUAL DC2314A
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
dc2314af
Linear Technology Corporation
LT 0116 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
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