LTC4236-1 [Linear]
Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor;
| 型号： | LTC4236-1 |
| 厂家： | 
Linear |
| 描述： | Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor |
| 文件： | 总8页 (文件大小：266K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
powerMOSFETcontrolledasaHotSwapswitch,twojump-
ers for enabling the second ideal diode and Hot Swap, four
LEDstoindicatethepowergoodstate, faultcondition, 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.
Table 1. DC2314A Assembly Options
TheDC2314AallowsverificationoftheLTC4236HotSwap
andidealdiodefunctionalityduringindividualrailramp-up
and ramp-down events, during power supply switchover,
in steady state, and in overcurrent fault conditions.
Version
Part
Overcurrent Fault
LATCHOFF
DC2314A-A
DC2314A-B
LTC4236-1
LTC4236-2
RETRY
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.
The DC2314A is configured for 12V operation with a 10A
current load.
BOARD AND CONTROLLER PERFORMANCE SUMMARYSpecifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supplies
V
Input Supply Range
2.9
8.91
4.5
18.0
11.11
5.5
V
A
V
V
IN
I
Board Current Limit
OUT = 11V
10
5
LIM
V
V
Internal Regulator Voltage
INTVCC
Internal V Undervoltage Lockout
INTV Rising
2.1
2.2
2.3
INTVCC(UVL)
CC
CC
Ideal Diode Control
ΔV
ΔV
Forward Regulation Voltage (V – V )
SENSE
2
15
28
mV
FWD(REG)
DGATE
INN
External N-Channel Gate Drive
IN < 7V, ΔV
= 0.15V; I = 0, –1µA
5
10
7
12
14
14
V
V
FWD
(V
DGATE1
– V ) and (V
– V
)
IN = 7V to 18V, ΔV = 0.15V; I = 0, –1μA
FWD
IN1
DGATE2
D2SRC
I
CPO Pull-Up Current
CPO = IN = D2SRC = 2.9V
CPO = IN = D2SRC = 18V
–60
–50
–100
–90
–130
–120
µA
µA
CPO(UP)
n
I
I
I
t
t
t
DGATE Fast Pull-Up Current
ΔV
ΔV
= 0.2V, ΔV = 0V, CPO = 17V
DGATE
–1.5
1.5
A
A
DGATE(FPU)
DGATE(FPD)
DGATE2(DN)
ON(DGATE)
OFF(DGATE)
PLH(DGATE2)
n
FWD
FWD
DGATE Fast Pull-Down Current
= –0.2V, ΔV
= 5V
n
DGATE
DGATE2 Off Pull-Down Current
D2OFF = 2V, ΔV
= 2.5V
= 10nF
50
100
0.25
0.2
200
0.5
0.5
µA
µs
µs
µs
DGATE2
DGATE Turn-On Delay
ΔV
FWD
ΔV
FWD
= 0.2V, C
DGATE
n
DGATE Turn-Off Delay
= –0.2V, C
= 10nF
n
DGATE
D2OFF Low to DGATE2 High
50
100
dc2314af
1
DEMO MANUAL DC2314A
BOARD AND CONTROLLER PERFORMANCE SUMMARYSpecifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Hot Swap Diode Control
ΔV
Current Limit Sense Voltage Threshold
SENSE
FB = 1.3V
FB = 0V
22.5
5.8
25
8.3
27.5
10.8
mV
mV
SENSE(TH)
+
–
(V
– V
)
SENSE
+
+
V
SENSE Undervoltage Lockout
SENSE Rising
1.8
10
1.9
50
2
V
SENSE+(UVL)
+
ΔV
ΔV
SENSE Undervoltage Lockout Hysteresis
90
mV
SENSE+(HYS)
HGATE
External N-Channel Gate Drive (V
– V
)
IN < 7V, I = 0, –1μA
IN = 7V to 18V, I = 0, –1μA
5
10
7
12
14
14
V
V
HGATE
OUT
ΔV
Gate High Threshold (V
– V )
OUT
3.6
–7
1
4.2
–10
2
4.8
–13
4
V
μA
HGATE(H)
HGATE(UP)
HGATE(DN)
HGATE(FPD)
HGATE
I
I
I
External N-Channel Gate Pull-Up Current
External N-Channel Gate Pull-Down Current
Gate Drive On, HGATE = 0V
Gate Drive Off, OUT = 12V, HGATE = OUT +5V
mA
mA
External N-Channel Gate Fast Pull-Down Current Fast Turn-Off, OUT = 12V, HGATE = OUT +5V
100
200
350
Input/Output Pin
V
V
V
V
ON, FB Pin Threshold Voltage
ON Pin Fault Reset Threshold Voltage
D2OFF Pin High Threshold
FTMR, DTMR Pin High Threshold
FTMR Pull-Up Current
Voltage Rising
ON Falling
1.21
0.57
1.21
1.198
–80
1.235
0.6
1.26
0.63
1.26
1.272
–120
2.7
V
V
IN(TH)
ON(RESET)
D2OFF(H,TH)
TMR(H)
D2OFF Rising
1.235
1.235
–100
2
V
V
I
I
FTMR = 1V, in Fault Mode
FTMR = 2V, No Faults
μA
μA
FTMR(UP)
FTMR(DN)
FTMR Pull-Down Current
1.3
Current Monitor
G
IMON Voltage Gain
ΔV
= 20mV and 5mV
99
100
20
101
V/V
IMON
SENSE
+
V
IMON Maximum Output Voltage
ΔV
SENSE
ΔV
SENSE
= 70mV, 5V ≤ SENSE ≤ 18V
3.5
2.7
5.5
2.9
V
V
IMON(MAX)
+
= 35mV, SENSE = 2.9V
R
IMON Output Resistance
ΔV
SENSE
= 200μV
15
27
kΩ
IMON(OUT)
dc2314af
2
DEMO MANUAL DC2314A
OPERATING PRINCIPLES
TheLTC4236isintendedtobuildacombinationofadiode-
OR circuit for two rails and a common single Hot Swap
pathforinrushcurrentlimitingandovercurrentprotection.
The Hot Swap section of the LTC4236 has independent
on/off control (ON pin).
Each ideal diode MOSFET is activated from an individual
chargepumpsource,andthesecondonehasanadditional
on/off control (D2OFF pin).
The LTC4236 regulates the forward voltage drop across
theidealdiodeMOSFETtoensuresmoothcurrenttransfer
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 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.
The Hot Swap fast acting current limit and internal timed
circuit breaker protect circuit components when a short-
circuit fault occurs.
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.
dc2314af
4
DEMO MANUAL DC2314A
QUICK START PROCEDURE
Demonstration circuit 2314A is easy to set up to evalu-
ate LTC4236. Refer to Figure 1 for proper measurement
equipment setup and follow the procedure below:
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.
TheDC2314AtestincludesindependenttestoftheLTC4236
Hot Swap functionality and ideal diode functionality.
HOT SWAP FUNCTIONALITY TEST
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.
This test is performed with singe rail operation when the
outputisprovidedthroughtwoseriesconnectedMOSFETs.
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:
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.
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
4.WithnorailvoltagesandJP1intheOFFposition,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.
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
IDEAL DIODE FUNCTIONALITY TEST
-
In this test, both ideal diodes are active and small varia
tions 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
withindividualindependentlabsupplies.Adjusteachinput
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.
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.
dc2314af
5
DEMO MANUAL DC2314A
QUICK START PROCEDURE
–
POWER
SUPPLY 1
+
LOAD
SWITCH
+
POWER
SUPPLY 2
–
Figure 1. Measurement Equipment Setup
dc2314af
6
DEMO MANUAL DC2314A
SCHEMATIC DIAGRAM
1
2
2
2
2
2
1
1
1
1
4
T
E
O U
5 2
H G A T
R
R
F T M
2 1
6 2
1
-
S E N S E
+
+
C S
R E
3
2
S E N S E
D G A T E
D T M
1 1
G
5 1
2
9
8
C
D 2 S R
4
2
C P O
F
D 2 O F
8 1
0 1
7
2 I N
1
D G A T E
8 2
4
C N
7 1
6 1
1 I N
C N
4
1
C P O
7 2
4
2
1
1
1
1
2
2
2
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
DEMO MANUAL DC2314A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
Thisdemonstrationboard(DEMOBOARD)kitbeingsoldorprovidedbyLinearTechnologyisintendedforuseforENGINEERINGDEVELOPMENT
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.
Thisnoticecontainsimportantsafetyinformationabouttemperaturesandvoltages. Forfurthersafetyconcerns, pleasecontactaLTCapplication
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
dc2314af
LT 0116 • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
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