MCOTS-C-28-40-HZ-D-M [SYNQOR]
DC-DC REG PWR SUPPLY MODULE;
| 型号： | MCOTS-C-28-40-HZ-D-M |
| 厂家： | 
SYNQOR WORLDWIDE HEADQUARTERS |
| 描述： | DC-DC REG PWR SUPPLY MODULE |
| 文件： | 总17页 (文件大小：7215K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MCOTS-C-28-40-HZ
Single Output
Half-brick
MILITARY COTS DC/DC CONVERTER
16-40V
16-50V
40V
12.5A
95%@6.25A/93%@12.5A
Continuous Input Transient Input
Output
Output
Efficiency
Full Power Operation: -55°C to +100°C
The MilQor series of Mil-COTS DC/DC converters brings
SynQor’s field proven high-efficiency synchronous
rectification technology to the Military/Aerospace
industry. SynQor’s ruggedized encased packaging
approach ensures survivability in demanding
environments. Compatible with the industry standard
format, these converters operate at a fixed frequency,
and follow conservative component derating guidelines.
They are designed and manufactured to comply with a
wide range of military standards.
Mil-COTS
-M-F
MCOTS-C-28-40-HZ-N
VERTER
A
DC/DC CON
28IN
@ 12.5
40VOUT
Safety Features
• 2250V, 30 MΩ input-to-output isolation
• Certified 60950-1 requirement for basic insulation
(see Standards and Qualifications page)
Designed and Manufactured in the USA
Control Features
n/Off control referenced to input return
Remote sense for the output voltage
Mechanical Features
• Industry standard half-brick pin-out
Wide output voltage trim range of +10%, -50%
Optional: Active current share for parallel applications
• Size:
2.49” x 2.39” x 0.51”
(63.1 x 60.6 x 13.0 mm)
• Total weight: 4.9 oz. (139 g)
• Flanged baseplate version available
Protection Features
nput under-voltage lockout
• Output current limit and short circuit protection
ctive back bias limit
uto-recovery output over-voltage protection
hermal shutdown
Operational Features
•
•
High efficiency, 93% at full rated load current
Operating input voltage range: 16-40V
• Fixed frequency switching provides predictable EMI
• No minimum load requirement
Screening/Qualification
S9100 and ISO 9001:2008 certified facility
Qualification consistent with MIL-STD-883
Available with S-Grade or M-Grade screening
Temperature cycling per MIL-STD-883, Method 1010,
Condition B, 10 cycles
Burn-In at 100C baseplate temperature
Final visual inspection per MIL-STD-2008
Full component traceability
Specification Compliance
MCOTS series converters (with an MCOTS filter) are designed to meet:
•
MIL-HDBK-704 (A-F)
RTCA/DO-160E Section 16
MIL-STD-1275 (B,D)
DEF-STAN 61-5 (Part 6)/(5 or 6)
MIL-STD-461 (C, D, E)
RTCA/DO-160E Section 22
•
•
•
•
•
Product # MCOTS-C-28V-40-HZ
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013 Page 1
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
BLOCK DIAGRAM
REGULATION STAGE
ISOLATION STAGE
CURRENT
SENSE
1
9
Vout(+)
Vin(+)
4
IN RTN
5
OUT RTN
GATE DRIVERS
GATE CONTROL
CURRENT
LIMIT
UVLO
7
2
OPTO-ISOLATION
DATA COUPLING
TRIM
ON/OFF
PRIMARY
CONTROL
SECONDARY
CONTROL
8
3
SENSE(+)
Share (-) (Full Feature Option)
B
6
Share (+) (Full Feature Option)
SENSE(-)
TYPICAL CONNECTION DIAGRAM
Vout(+)
Vin(+)
Electrolytic
Capacitor
Vsense(+)
External
Input
Filter
Rtrim-up
or
Vin
Trim
ON/OFF
Vin(_)
Cload
Rtrim-down
Iload
Vsense(_)
Vout(_)
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 2
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
MCOTS-C-28V-40-HZ ELECTRICAL CHARACTERISTICS
Ta = 25 °C, Vin = 28dc unless otherwise noted; full operating temperature range is -55 °C to +100 °C baseplate temperature with appropriate power
derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Operating Transient Protection
Isolation Voltage
-1
60
40
50
V
V
V
Continuous
Continuous
100 ms transient, square wave
Input to Output
Input to Base-Plate
Output to Base-Plate
Operating Temperature
Storage Temperature
2250
2250
2250
100
135
18
Vdc
Vdc
Vdc
°C
°C
V
Basic Insulation, Pollution Degree 2
-55
-65
-2
Baseplate temperature
Voltage at ON/OFF input pin
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Recommended External Input Capacitance
Input Filter Component Values (Lin\C2)
Maximum Input Current
No-Load Input Current
Disabled Input Current
Response to Input Transient
Input Terminal Ripple Current
Recommended Input Fuse
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
16
28
40
V
50V transient for 100 ms
15.1
14.2
0.5
15.4
14.5
0.9
470
0.34\23
15.7
14.8
1.5
V
V
V
µF
µH\µF
A
mA
mA
V
Typical ESR 0.1-0.2 Ω
Internal values; see Figure D
At low line, Full load and 10% trim up
45
350
8
280
5
3.5
400
0.25 V/us input transient
RMS
Fast acting external fuse recommended
mA
A
50
39.34
39.80
40.00
40.56
V
See Note 1
±0.25\100
±0.25\100
±0.360
%\mV
%\mV
V
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
±1.00
41.20
V
Over sample, line, load, temperature & life
20 MHz bandwidth; See Note 2
Full Load
100
25
200
50
mV
mV
RMS
Full Load
Operating Output Current Range
0
13.8
12.5
16.3
A
A
V
A
mA
mF
Subject to thermal derating
Output Voltage 10% Low
See Note 3
Negative current drawn from output
Negative current drawn from output
12.5 A Resistive Load
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Back-Drive Current Limit while Enabled
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
15
16
4
2
0
6
6
1.5
3
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A-5
A/µs)
Settling Time
2.2
V
50% to 75% to 50% IOUT max, 100 µF load cap
To within 1% VOUT nom
500
µs
Output Voltage Trim Range
Output Over-Voltage Protection
EFFICIENCY
-50
47.2
#N/A!
10
51.2
#N/A!
%
V
#N/A!
%
Across Pins 8 & 6; Figure C
Over full temp range
#N/A!
49.2
#N/A!
93
100% Load
See Figure 1 for efficiency curve
50% Load
95
%
See Figure 1 for efficiency curve
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 3
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
MCOTS-C-28V-40-HZ ELECTRICAL CHARACTERISTICS
Ta = 25 °C, Vin = 28dc unless otherwise noted; full operating temperature range is -55 °C to +100 °C baseplate temperature with appropriate power
derating. Specifications subject to change without notice.
Parameter
DYNAMIC CHARACTERISTICS
Min.
Typ.
Max.
Units Notes & Conditions
Turn-On Transient
Turn-On Time
24
35
40
ms
Full load, Vout=90% nom; See Note 5
Output Voltage Overshoot
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
5
%
No Load, 1.5mF load cap
2250
30
1000
V
MΩ
pF
Isolation Capacitance (input to output)
See Note 4
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
Maximum Baseplate Temperature, Tb
FEATURE CHARACTERISTICS
125
125
125
100
°C
°C
°C
°C
Package rated to 150 °C
UL rated max operating temp 130 °C
Switching Frequency
230
240
250
kHz
Isolation stage switching freq. is half this
ON/OFF Control
Off-State Voltage
On-State Voltage
2.4
-2.0
18.0
0.8
V
V
ON/OFF Control
Pull-Up Voltage
Pull-Up Resistance
15
50
125
10
18
V
kΩ
°C
°C
Over-Temperature Shutdown OTP Trip Point
Over-Temperature Shutdown Restart Hysteresis
RELIABILITY CHARACTERISTICS
Calculated MTBF per MIL-HDBK-217F (GB)
Calculated MTBF per MIL-HDBK-217F (GM)
Field Demonstrated MTBF
Average PCB Temperature
6
4.1
0.92
10 Hrs. Tb = 70 °C
10 Hrs. Tb = 70 °C
10 Hrs. See our website for details
6
6
Note 1: Line and load regulation is limited by duty cycle quantization and does not indicate a shift in the internal voltage reference.
Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com).
Note 3: If the output voltage falls below the Output DC Current Limit Shutdown Voltage for more than 50ms, then the unit will enter into hiccup mode,
with a 500ms off-time.
Note 4: Higher values of isolation capacitance can be added external to the module.
Note 5: Add 30ms to Full-Featured Turn-On Time to allow for synchronization
STANDARDS COMPLIANCE
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1/R:2011-12
Basic Insulation
CAN/CSA-C22.2 No. 60950-1/A1:2011
EN60950-1/A12:2011
Note: An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new releases or
download from the SynQor website.
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 4
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
100
95
90
85
80
75
70
65
60
100
95
90
85
80
75
70
65
60
16 Vin
28 Vin
40 Vin
16 Vin
28 Vin
40 Vin
-55ºC
25ºC
100ºC
0
1
2
3
4
5
6
7
8
9
10 11 12 13
Case Temperature (ºC)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for
Figure 2: Efficiency at nominal output voltage and 60% rated power vs.
minimum, nominal, and maximum input voltage at 25°C.
case temperature for minimum, nominal, and maximum input voltage.
60
50
40
30
20
60
50
40
30
20
16 Vin
16 Vin
10
10
0
28 Vin
28 Vin
40 Vin
40 Vin
0
-55ºC
25ºC
100ºC
0
1
2
3
4
5
6
7
8
9
10 11 12 13
Case Temperature (ºC)
Load Current (A)
Figure 3: Power Dissipation at nominal output voltage vs. load current
Figure 4: Power Dissipation at nominal output voltage and 60% rated power
for minimum, nominal, and maximum input voltage at TCASE=25°C.
vs. case temperature for minimum, nominal, and maximum input voltage.
14
12
10
8
50
40
30
6
20
4
16 Vin
10
28 Vin
2
40 Vin
0
0
50
60
70
80
90
100
110
0
2
4
6
8
10
12
14
16
18
20
Load Current (A)
Base Plate Temperature (°C)
Figure 6: Output I-V Characteristics (output voltage vs. load current)
showing typical current limit curves. See Current Limit section in the
Application Notes.
Figure 5: Thermal Derating (maximum output current vs. base plate
temperature) at nominal input voltage.
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 5
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
Figure 7: Typical Startup Waveform, input voltage pre-applied, ON/OFF Pin
Figure 8: Turn-On Transient at full resistive load and zero output capacitance
on Ch 2.
initiated by Vin. Ch 1: Vout (20V/div). Ch 2: Vin (20V/div).
Figure 9: Input Terminal Current Ripple, iC, at full rated output current and
nominal input voltage with 470µF electrolytic capacitor (0.5 A/div). Bandwidth:
20MHz. See Figure 13.
Figure 10: Output Voltage Ripple, Vout, at nominal input voltage and rated load
current (100 mV/div). Load capacitance: 1µF ceramic capacitor and 100µF
eletrolytic capacitor. Bandwidth: 20 MHz. See Figure 13.
Figure 11: Output Voltage Response to Step-Change in Load Current (50%-
75%-50% of Iout(max); dI/dt = 5 A/µs). Load cap: 1 µF ceramic and 100 µF
electrolytic capacitors. Ch 1: Vout (2V/div), Ch 2: Iout (5A/div).
Figure 12: Output Voltage Response to Step-Change in Input Voltage (250V/
ms). Load cap: 100 µF electrolytic output capacitance. Ch 1: Vout (10V/div), Ch
2: Vout (20V/div).
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 6
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
1 µF
ceramic capacitor
3.3 µH
source impedance
i
DC-DC
Converter
C
VOUT
VSOURCE
470 µF,
0.2Ω ESR
electrolytic capacitor
100 µF,
150mΩ ESR
electrolytic capacitor
Figure 13: Test Set-up Diagram showing measurement points for Input
Terminal Ripple Current (Figure 9) and Output Voltage Ripple (Figure 10).
Figure 14: Output Short Load Current (10A/div) as a function of time (20ms/
div) when the converter attempts to turn on into a 1 mΩ short circuit.
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 7
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
BASIC OPERATION AND FEATURES
CONTROL FEATURES
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits
the user to control when the converter is on or off. This input is
referenced to the return terminal of the input bus, Vin(-).
In the negative logic version, the ON/OFF signal is active low
(meaning that a low voltage turns the converter on). Figure A
details possible circuits for driving the ON/OFF pin. Figure B is a
detailed look of the internal ON/OFF circuitry.
REMOTE SENSE Pins 8(+) and 6(-): The SENSE(+) and
SENSE(-) inputs correct for voltage drops along the conductors
that connect the converter’s output pins to the load.
Pin 8 should be connected to Vout(+) and Pin 6 should be
connected to Vout(-) at the point on the board where regulation
is desired. If these connections are not made, the converter will
deliver an output voltage that is slightly higher than its specified
value.
Note: The Output Over-Voltage Protection circuit senses the
voltage across the output (Pins 9 and 5) to determine when it
should trigger, not the voltage across the converter’s sense leads
(Pins 8 and 6). Therefore, the resistive drop on the board should
be small enough so that output OVP does not trigger, even during
load transients.
This converter series uses a two-stage power conversion topology.
The first stage keeps the output voltage constant over variations in
line, load, and temperature. The second stage uses a transformer
to provide the functions of input/output isolation and voltage step-
down to achieve the low output voltage required.
Both the first stage and the second stage switch at a fixed frequency
for predictable EMI performance. Rectification of the transformer’s
output is accomplished with synchronous rectifiers. These devices,
which are MOSFETs with a very low on-state resistance, dissipate
significantly less energy than Schottky diodes, enabling the
converter to achieve high efficiency.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation in many applications; however,
adding a heatsink provides improved thermal derating performance
in extreme situations. To further withstand harsh environments
and thermally demanding applications, the converter is available
totally encased. See Ordering Information page for available
thermal design options.
SynQor half-brick converters use the industry standard footprint
and pin-out.
ON/OFF
ON/OFF
OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits
the user to adjust the output voltage across the sense leads up
or down according to the trim range specifications. SynQor uses
industry standard trim equations.
To decrease the output voltage, the user should connect a resistor
between Pin 7 (TRIM) and Pin 6 (SENSE( ) input). For a desired
decrease of the nominal output voltage, the value of the resistor
should be:
Vin(_)
Vin(_)
Remote Enable Circuit
Negative Logic
(Permanently Enabled)
100%
– 2
5V
ON/OFF
Rtrim-down =
(
|
)
kΩ
Δ%
where
TTL/
CMOS
ON/OFF
Vin(_)
Vnominal – Vdesired
Δ% =
|
× 100%
Vnominal
Vin(_)
To increase the output voltage, the user should connect a resistor
between Pin 7 (TRIM) and Pin 8 (SENSE(+) input). For a desired
increase of the nominal output voltage, the value of the resistor
should be:
Open Collector Enable Circuit
Direct Logic Drive
Figure A: Various Circuits for Driving the ON/OFF Pin
Vnominal
– 2
18V(max)
5V
(
)
× Vdesired + Vnominal
Rtrim-up =
kΩ
1.225
Vdesired – Vnominal
50k
10k
ON/OFF
Vin(_)
TTL
Figure B: Internal ON/OFF Pin Circuitry
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 8
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
The Trim Graph in Figure C shows the relationship between the
trim resistor value and Rtrim-up and Rtrim-down, showing the
total range the output voltage can be trimmed up or down.
Protection Features
Input Under-Voltage Lockout (UVLO): The converter is
designed to turn off when the input voltage is too low, helping to
avoid an input system instability problem, which is described in
more detail in the application note titled “Input System Instability”
on the SynQor website. The lockout circuitry is a comparator with
DC hysteresis. When the input voltage is rising, it must exceed the
typical “Turn-On Voltage Threshold” value* before the converter
will turn on. Once the converter is on, the input voltage must
fall below the typical Turn-Off Voltage Threshold value before the
converter will turn off.
Note: The TRIM feature does not affect the voltage at which the
output over-voltage protection circuit is triggered. Trimming the
output voltage too high may cause the over-voltage protection
circuit to engage, particularly during transients.
It is not necessary for the user to add capacitance at the TRIM pin.
The node is internally filtered to eliminate noise.
Total DC Variation of Vout: For the converter to meet its full
specifications, the maximum variation of the DC value of Vout, due
to both trimming and remote load voltage drops, should not be
greater than that specified for the output voltage trim range.
Output Current Limit (OCP): If the output current exceeds
the “Output DC Current Limit Inception” value*, then a fast linear
current limit controller will reduce the output voltage to maintain
a constant output current. If as a result, the output voltage falls
below the “Output DC Current Limit Shutdown Voltage”* for more
than 50 ms, then the unit will enter into hiccup mode, with a 500
ms off-time. The unit will then automatically attempt to restart.
Back-Drive Current Limit: If there is negative output current
of a magnitude larger than the “Back-Drive Current Limit while
Enabled” specification*, then a fast back-drive limit controller will
increase the output voltage to maintain a constant output current.
If this results in the output voltage exceeding the “Output Over-
Voltage Protection” threshold*, then the unit will shut down.
100,000.0
10,000.0
1,000.0
100.0
10.0
Output Over-Voltage Limit (OVP): If the voltage across the
output pins exceeds the Output Over-Voltage Protection threshold,
the converter will immediately stop switching. This prevents
damage to the load circuit due to 1) excessive series resistance in
output current path from converter output pins to sense point, 2)
a release of a short-circuit condition, or 3) a release of a current
limit condition. Load capacitance determines exactly how high
the output voltage will rise in response to these conditions. After
500ms the converter will automatically restart.
1.0
0.1
0.0
0
5
10
15
20
25
30
35
40
45
50
% Increase in Vout
% Decrease in Vout
Figure C: Trim Graph
Over-Temperature Shutdown (OTP): A temperature sensor
on the converter senses the average temperature of the module.
The thermal shutdown circuit is designed to turn the converter off
when the temperature at the sensed location reaches the “Over-
Temperature Shutdown” value*. It will allow the converter to turn
on again when the temperature of the sensed location falls by the
amount of the “Over-Temperature Shutdown Restart Hysteresis”
value*.
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 500 ms when it is
shut down due to a fault. This generates a 2 Hz “hiccup mode,”
which prevents the converter from overheating. In all, there
are three ways that the converter can be shut down, initiating a
Startup Inhibit Period:
• Output Over-Voltage Protection
• Current Limit
• Short Circuit Protection
* See Electrical Characteristics section.
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 9
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
APPLICATION CONSIDERATIONS
Thermal Considerations: For baseplated and encased versions,
the max operating baseplate temperature, TB, is 100ºC. Refer to
the Thermal Derating Curves in the Technical Figures section to
see the available output current at baseplate temperatures below
100ºC.
Input System Instability: This condition can occur because any
DC-DC converter appears incrementally as a negative resistance
load. A detailed application note titled “Input System Instability” is
available on the SynQor website which provides an understanding
of why this instability arises, and shows the preferred solution for
correcting it.
A power derating curve can be calculated for any heatsink that is
attached to the base-plate of the converter. It is only necessary to
determine the thermal resistance, RTHBA, of the chosen heatsink
between the baseplate and the ambient air for a given airflow rate.
This information is usually available from the heatsink vendor. The
following formula can the be used to determine the maximum
power the converter can dissipate for a given thermal condition if
its base-plate is to be no higher than 100ºC.
Application Circuits: A typical circuit diagram, Figure D below
details the input filtering and voltage trimming.
Input Filtering and External Input Capacitance: Figure
E below shows the internal input filter components. This filter
dramatically reduces input terminal ripple current, which otherwise
could exceed the rating of an external electrolytic input capacitor.
The recommended external input capacitance is specified in the
Input Characteristics section of the Electrical Specifications. More
detailed information is available in the application note titled “EMI
Characteristics” on the SynQor website.
max
100ºC - TA
RTHBA
=
P
diss
This value of maximum power dissipation can then be used in
conjunction with the data shown in the Power Dissipation Curves
in the Technical Figures section to determine the maximum load
current (and power) that the converter can deliver in the given
thermal condition.
Output Filtering and External Output Capacitance: The
internal output filter components are shown in Figure E below. This
filter dramatically reduces output voltage ripple. Some minimum
external output capacitance is required, as specified in the Output
Characteristics area of the Electrical Characteristics section. No
damage will occur without this capacitor connected, but peak
output voltage ripple will be much higher.
For convenience, Thermal Derating Curves are provided in the
Technical Figures section.
Vout(+)
Vin(+)
Vsense(+)
Electrolytic
Capacitor
External
Input
Filter
Rtrim-up
Vin
Trim
or
ON/OFF
Vin(_)
Cload
Rtrim-down
Iload
Vsense(_)
Vout(_)
Figure D: Typical Application Circuit (negative logic unit, permanently enabled)
Lin
Vin(+)
Vout(+)
Vout(-)
Regulation
Stage
Current
Sense
Isolation
Stage
C2
C1
Vin(_)
Figure E: Internal Input and Output Filter Diagram (component values listed in Electrical Characteristics section)
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596 www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 10
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
Active Current Share Application Section
Overview: The full-featured option, which is specified by an “F”
as the last character of the part number, supports current sharing
by adding two additional pins: SHARE(+) and SHARE(-)
• Input power pins and output power pins should be tied
together between units, preferably with wide overlapping
copper planes, after any input common-mode choke.
• The SHARE(+) and SHARE(-) pins should be routed between all
paralleled units as a differential pair.
• The ON/OFF pins should be connected in parallel, and rise/fall
times should be kept below 2ms.
• The SENSE(+) and SENSE(-) pins should be connected either
locally at each unit or separately to a common sense point. If
an output common-mode choke is used, sense lines should be
connected on the module-side of the choke.
Connection of Paralleled Units: Up to 100 units can be placed in
parallel. In this current share architecture, one unit is dynamically
chosen to act as a master, controlling all other units. It cannot be
predicted which unit will become the master at any given time, so
units should be wired symmetrically (see Figures F & G).
• If the TRIM pin is used, then each unit should have its own trim
resistor connected locally between TRIM and SENSE(+)
or SENSE(-).
Vin(+)
Vout(+)
>470nH
>10µF
Sense (+)
On/Off
Load
Trim
Share (+)
Share (-)
Electrolytic
Capacitor
Vin(-)
Sense (-)
Vout(-)
Vin(+)
Vout(+)
>470nH
Sense (+)
On/Off
Share (+)
Trim
Share (-)
Electrolytic
Capacitor
Sense (-)
Vout(-)
Vin(-)
Up to 100 Units
Vin(+)
On/Off
Vout(+)
>470nH
Sense (+)
Trim
Share (+)
Share (-)
Electrolytic
Capacitor
Sense (-)
Vout(-)
Vin(-)
Figure F: Typical Application Circuit for Paralleling of Full-Featured Units
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596 www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 11
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
Automatic Configuration: The micro-controller inside each power
converter unit is programmed at the factory with a unique chip number.
In every other respect, each shared unit is identical and has the same
orderable part number.
RS-485 Physical Layer: The internal RS-485 transceiver includes many
advanced protection features for enhanced reliability:
• Current Limiting and Thermal Shutdown for
Driver Overload Protection
• IEC61000 ESD Protection to +/- 16.5 kV
• Hot Plug Circuitry – SHARE(+) and SHARE(-)
Outputs Remain Tri-State During Power-up/Power-down
On initial startup (or after the master is disabled or shuts down), each unit
determines the chip number of every other unit currently connected to the
shared serial bus formed by the SHARE(+) and SHARE(-) pins. The unit
with the highest chip number dynamically reconfigures itself from slave to
master. The rest of the units (that do not have the highest chip number)
become slaves.
Internal Schottky Diode Termination: Despite signaling at high
speed with fast edges, external termination resistors are not necessary.
Each receiver has four Schottky diodes built in, two for each line in the
differential pair. These diodes clamp any ringing caused by transmission line
reflections, preventing the voltage from going above about 5.5 V or below
about -0.5 V. Any subsequent ringing then inherently takes place between
4.5 and 5.5 V or between -0.5 and 0.5 V. Since each receiver on the bus
contains a set of clamping diodes to clamp any possible transmission line
reflection, the bus does not necessarily need to be routed as a daisy-chain.
The master unit then broadcasts its control state over the shared serial
bus on a cycle-by-cycle basis. The slave units interpret and implement
the control commands sent by the master, mirroring every action of the
master unit.
If the master is disabled or encounters a fault condition, all units will
immediately shut down, and if the master unit is unable to restart, then
the unit with the next highest chip number will become master. If a slave
unit is disabled or encounters a fault condition, all other units continue to
run, and the slave unit can restart seamlessly.
Pins SHARE(+) and SHARE(-) are referenced to Vin(-), and therefore should
be routed as a differential pair near the Vin(-) plane for optimal signal
integrity. The maximum difference in voltage between Vin(-) pins of all
units on the share-bus should be kept within 0.3 V to prevent steady-state
conduction of the termination diodes. Therefore, the Vin(-) connections to
each unit must be common, preferably connected by a single copper plane.
Automatic Interleaving: The slave units automatically lock frequency
with the master, and interleave the phase of their switching transitions
for improved EMI performance. To obtain the phase angle relative to the
master, each slave divides 360 degrees by the total number of connected
units, and multiples the result by its rank among chip numbers of connected
units.
Share Accuracy: Inside each converter micro-controller, the duty cycle
is generated digitally, making for excellent duty cycle matching between
connected units. Some small duty cycle mismatch is caused by (well
controlled) process variations in the MOSFET gate drivers. However, the
voltage difference induced by this duty cycle mismatch appears across the
impedance of the entire power converter, from input to output, multiplied
by two, since the differential current flows out of one converter and into
another. So, a small duty cycle mismatch yields very small differential
currents, which remain small even when 100 units are placed in parallel.
ORing Diodes placed in series with the converter outputs must also have
a resistor smaller than 500 Ω placed in parallel. This resistor keeps the
output voltage of a temporarily disabled slave unit consistent with the
active master unit. If the output voltage of the slave unit were allowed to
totally discharge, and the slave unit tried to restart, it would fail because
the slave reproduces the duty cycle of the master unit, which is running in
steady state and cannot repeat an output voltage soft-start.
In other current-sharing schemes, it is common to have a current-sharing
control loop in each unit. However, due to the limited bandwidth of this
loop, units do not necessarily share current on startup or during transients
before this loop has a chance to respond. In contrast, the current-sharing
scheme used in this product has no control dynamics: control signals are
transmitted fast enough that the slave units can mirror the control state
of the master unit on a cycle-by-cycle basis, and the current simply shares
properly, from the first switching cycle to the last.
Common Mode Filtering must be either a single primary side choke
handling the inputs from all the paralleled units, or multiple chokes placed
on the secondary side. This ensures that a solid Vin(-) plane is maintained
between units. Adding a common-mode choke at the output eliminates the
need for the 470 nH indcutor at the output of shared units when Vout > 18
V. If an output common-mode choke is used, sense connections must be
made on the module-side of the choke.
Resonance between Output Capacitors is Possible: When multiple
higher-voltage modules are paralleled, it is possible to excite a series
resonance between the output capacitors internal to the module and the
parasitic inductance of the module output pins. This is especially likely at
higher output voltages where the module internal capacitance is relatively
small. This problem is independent of external output capacitance. For
modules with an output voltage greater than 18 V, to ensure that this
resonant frequency is below the switching frequency it is recommended to
add a nominal 470 nH of inductance, located close to the module, in series
with each converter output. There must be at least 10 μF of capacitance
per converter, located on the load-side of that inductor. The inductance
could be from the leakage inductance of a secondary-side common-mode
choke; in which case the output capacitor should be appropriately sized for
the chosen choke. When using an output common-mode choke, the Sense
lines must be connected on the module-side of the common-mode choke
(see Figure G).
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 12
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
470 nH (nom)
Vin(+)
On/Off
Vout(+)
Sense(+)
A
B
A
≥1 nF
Share(+)
Share(-)
Trim
Load
≥10 μF
Elec.
Cap.
B
Sense(-)
Vout(-)
Vin(-)
470 nH (nom)
Vin(+)
On/Off
Vout(+)
Sense(+)
A
B
Electrolytic
Capacitor
Share(+)
Share(-)
Trim
≥10 μF
Sense(-)
Vout(-)
Vin(-)
Up to 100 Units
470 nH (nom)
Vin(+)
On/Off
Vout(+)
Sense(+)
A
B
Electrolytic
Capacitor
Share(+)
Share(-)
Trim
≥10 μF
Sense(-)
Vout(-)
Vin(-)
Figure G: Typical Application Circuit for Paralleling of Full-Featured Units with an Output Common-Mode Choke. If an input common-mode choke is used, Vin(-)
MUST be tied together AFTER the choke for all units. 470 nH (nominal) inductor or an output common-mode choke is required for outputs >18 V. See Figure G for output
common-mode choke configuration.
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 13
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
Mechanical Drawing – Standard
2.486 .020 [63,14
0,5]
2.00 [50,8 ]
1.400 [35,56 ]
1.000 [25,4 ]
.700 [17,78 ]
.400 [10,16 ]
+.002
-.005
+0,05
.512
.243 .020
[6,17 0,5]
13
.163
[4,14 ]
[
-0,12
]
OVERALL
HEIGHT
9
8
7
6
5
.243 .020
[6,17 0,5]
2.386 .020
[60,6
0,5]
TOP VIEW
1.90
[48,3 ]
1.90
[48,3 ]
SIDE VIEW
.233 .020
[5,92
0,5]
1
2
B
3
4
+.007
.027
THRU HOLE
M3 (SEE NOTE 7)
STANDOFFS (4)
-.010
+0,17
-0,25
.400 [10,16 ]
.800 [20,32 ]
1.00 [25,4 ]
0,69
[
]
BOTTOMSIDE CLEARANCE
.543 .020
[13,79 0,5]
1.400 [35,56 ]
NOTES
PIN DESIGNATIONS
1)
2)
3)
Applied torque per screw should not exceed 6in-lb (0.7 Nm).
Baseplate flatness tolerance is 0.004" (.10mm) TIR for surface.
Pin
1
Name
Vin(+)
Function
Positive input voltage
Pins 1-4, 6-8, and B are 0.040” (1.02mm) diameter, with 0.080” (2.03mm)
diameter standoff shoulders.
2
ON/OFF
TTL input to turn converter on and off,
referenced to Vin(–), with internal pull up.
4)
Pins 5 and 9 are 0.080” (2.03 mm) diameter with 0.125" (3.18 mm)
diameter standoff shoulders.
All Pins: Material – Copper Alloy; Finish – Matte Tin over Nickel plate
Weight: 4.9 oz. (139 g) typical
Threaded or Non-Threaded options available
All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
B
3
4
5
6
7
8
9
SHARE(+)
SHARE(-)
IN RTN
OUT RTN
SENSE(–)
TRIM
Active current share differential pair (see
Full-Feature Application Notes) (Note 4)
5)
6)
7)
8)
Input Return
Ouput Return
Negative remote sense
Output voltage trim
Positive remote sense
1
2
3
SENSE(+)
Vout(+)
Positive output voltage
9)
Workmanship: Meets or exceeds IPC-A610 Class II
Notes:
1)
SENSE(–) should be connected to Vout(–) either remotely or
at the converter.
2)
3)
Leave TRIM pin open for nominal output voltage.
SENSE(+) should be connected to Vout(+) either remotely or
at the converter.
4)
On standard product, Pin B & Pin 3 are absent
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 14
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
Mechanical Drawing – Flanged Option
1.400 [35.56 ]
1.000 [25.4 ]
.700 [17.78 ]
.400 [10.16 ]
.18 [4.6 ]
SEE NOTES 5 & 6
3.15 [80 ]
USE W/ 4-40 OR
M3 SCREW (6x)
RECOM. TORQUE
3 in.lb
2.486 .020 [63.14
0.5]
.500
[12.7
OVERALL
HEIGHT
.025
0.63]
6
7
8
5
9
.13[3.3]
.01 [0.2]
1.900
[48.26 ]
BOTTOM VIEW
TOP VIEW
1.61
[40.9 ]
1.87
[47.4 ]
2.386 .020
[60.6 0.5]
.31
[7.9 ]
.96
[24.4 ]
1
4
3
B
2
1
.027 .020
[0.69 0.5]
.125
[3.18 ]
.400 [10.16 ]
.800 [20.32 ]
1.000 [25.4 ]
1.400 [35.56 ]
.543 .020 [13.79
0.5]
0.5]
0.5]
.775 .020 [19.69
.875 .020 [22.23
2.175 .020 [55.25
0.5]
NOTES
PIN DESIGNATIONS
1)
Applied torque per screw should not exceed 5in-lb (3in-lb
recommended).
Pin
1
Name
Vin(+)
Function
Positive input voltage
2)
3)
Baseplate flatness tolerance is 0.01” (.25mm) TIR for surface.
2
ON/OFF
TTL input to turn converter on and off,
referenced to Vin(–), with internal pull up.
Pins 1-4, 6-8, and B are 0.040” (1.02mm) diameter, with 0.080” (2.03mm)
diameter standoff shoulders.
B
3
4
5
6
7
8
9
SHARE(+)
SHARE(-)
IN RTN
OUT RTN
SENSE(–)
TRIM
Active current share differential pair (see
Full-Feature Application Notes) (Note 4)
4)
Pins 5 and 9 are 0.080” (2.03 mm) diameter with 0.125" (3.18 mm)
diameter standoff shoulders.
All Pins: Material – Copper Alloy; Finish – Matte Tin over Nickel plate
Weight: 4.8 oz. (137 g) typical
All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
Input Return
Ouput Return
Negative remote sense
Output voltage trim
Positive remote sense
5)
6)
7)
1
2
3
SENSE(+)
Vout(+)
Positive output voltage
8)
9)
Workmanship: Meets or exceeds IPC-A610 Class II
A thermal interface material is required to assure proper heat
transfer from the flanged baseplate to the cooling surface. Thermal
grease, conductive pads, compounds, and other similar products are
available from many heatsink manufacturers.
Notes:
1)
SENSE(–) should be connected to Vout(–) either remotely or
at the converter.
2)
3)
Leave TRIM pin open for nominal output voltage.
SENSE(+) should be connected to Vout(+) either remotely or
at the converter.
4)
On standard product, Pin B & Pin 3 are absent
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 15
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
Mil-COTS Qualification
# Tested Consistent with MIL- Consistent with MIL-STD-
Test Name
Life Testing
Shock-Vibration
Humidity
Details
(# Failed)
STD-883F Method
883F Method 5005
Visual, mechanical and electrical testing before, during
and after 1000 hour burn-in @ full load
Visual, mechanical and electrical testing before, during
and after shock and vibration tests
15
(0)
Method 1005.8
5
(0)
MIL-STD-202,
Methods 201A & 213B
8
(0)
10
(0)
15
(0)
+85˚C, 95% RH, 1000 hours, 2 minutes on / 6 hours off
Method 1004.7
Method 1010.8
Method 2003
Temperature
Cycling
500 cycles of -55˚C to +100˚C
(30 minute dwell at each temperature)
Condition A
Solderability
DMT
15 pins
-65˚C to +110˚C across full line and load specifications
in 5˚C steps
7
(0)
2
(0)
Altitude
70,000 feet (21 km), see Note
Note: A conductive cooling design is generally needed for high altitude applications because of naturally poor convective cooling at rare atmospheres.
Mil-COTS DC-DC Converter and Filter Screening
Screening
Baseplate Operating Temperature
Storage Temperature
Pre-Cap Inspection
Temperature Cycling
Burn-In
Process Description
S-Grade
-55˚C to +100˚C
-65˚C to +135˚C
●
M-Grade
-55˚C to +100˚C
-65˚C to +135˚C
IPC-610, Class III
Method 1010, Condition B, 10 Cycles
100˚C Baseplate
●
●
12 Hours
25˚C
●
96 Hours
Final Electrical Test
Final Visual Inspection
100%
-55˚C, +25˚C, +100˚C
●
MIL-STD-2008
MILCOTS MIL-STD-810G Qualification Testing
MIL-STD-810G Test
Fungus
Method
Description
508.6
Table 508.6-I
500.5 - Procedure I
500.5 - Procedure II
500.5 - Procedure III
513.6 - Procedure II
509.5
Storage: 70,000ft. / 2 Hr. duration
Operating; 70,000ft. / 2 Hr. duration; Ambient Temperature
Storage: 8,000ft. to 40,000ft.
Operating - 15g's
Altitude
Rapid Decompression
Acceleration
Salt Fog
Storage
501.5 - Procedure I
501.5 - Procedure II
502.5 - Procedure I
502.5 - Procedure II
Storage: 135°C / 3 hrs
High Temperature
Low Temperature
Operating: 100°C / 3 hrs
Storage: -65C / 4 hrs
Operating: -55C / 3 hrs
Temperature Shock
Rain
503.5 - Procedure I - C Storage: -65C to 135C; 12 cycles
506.5 - Procedure I
512.5 - Procedure I
507.5 - Procedure II
514.6 - Procedure I
516.6 - Procedure I
516.6 - Procedure VI
514.6 - Category 14
510.5 - Procedure I
510.5 - Procedure II
Wind Blown Rain
Non-Operating
Immersion
Humidity
Aggravated cycle @ 95% RH (Figure 507.5-7 aggravated temp - humidity cycle, 15 cycles)
10-2000 Hz, PSD level of 1.5 g2/Hz(54.6grms), duration = 1 hr/axis
20g's peak, 11ms, Functional Shock (Operating no load) (saw tooth)
Bench Handling Shock
Rotary wing aircraft - helicopter, 4hrs/axis, 20g's (sine sweep from 10 - 500HZ)
Blowing Dust
Random Vibration
Shock
Sinusoidal vibration
Sand and Dust
Blowing Sand
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 16
MCOTS-C-28-40-HZ
Output: 40V
Current: 12.5A
Technical Specification
Ordering Information/ Part Numbering
Example MCOTS-C-28-40-HZ-N-S
Not all combinations make valid part numbers, please contact SynQor for availability. See product summary page for details.
Output
Voltage
Heatsink
Option
Screening
Level
Family
Product Input Voltage
Package
Options
05:5V
9R6:9.6V
12:12V
15:15V
24:24V
28:28V
40:40V
50:50V
28: 16-40V
28E: 16-70V
28V: 9-40V
28VE: 9-70V
48: 34-75V
N:Normal Threaded
D:Normal Non-
Threaded
[ ]:Standard
Feature
F:Full Feature
S: S-Grade
M: M-Grade
MCOTS
C: Converter
HZ:Half Brick Zeta
F:Flanged
PATENTS
APPLICATION NOTES
SynQor holds the following U.S. patents, one or more of which apply to
each product listed in this document. Additional patent applications may
be pending or filed in the future.
A variety of application notes and technical white papers can be downloaded
in pdf format from our website.
5,999,417
6,894,468
7,119,524
7,765,687
6,222,742
6,896,526
7,269,034
7,787,261
6,545,890
6,927,987
7,272,021
8,023,290
6,577,109
7,050,309
7,272,023
8,149,597
6,594,159
7,072,190
7,558,083
8,493,751
6,731,520
7,085,146
7,564,702
Contact SynQor for further information:
Warranty
Phone:
978-849-0600
SynQor offers a two (2) year limited warranty. Complete warranty
information is listed on our website or is available upon request from
SynQor.
Toll Free: 888-567-9596
Fax:
978-849-0602
E-mail:
Web:
mqnbofae@synqor.com
www.synqor.com
Information furnished by SynQor is believed to be accurate and reliable.
However, no responsibility is assumed by SynQor for its use, nor for any
infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any
patent or patent rights of SynQor.
Address: 155 Swanson Road
Boxborough, MA 01719
USA
Product # MCOTS-C-28V-40-HZ Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006075 Rev. D
11/13/2013
Page 17
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