Mil-COTS

MCOTS-C-28-270-FZ
Single Output
Full-brick
MILITARY COTS DC/DC CONVERTER
16-40V
Continuous Input
16-50V
Transient Input
270V
Output
3.7A
Output
95%@1.85A / 94% @3.7A
Efficiency
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
F
M-
N-
FZ
0A
27
.7
8-ER @ 3
2
- T
T
C R
OU
S- VE 70V
OT CONV IN 2
MCC/DC0(50)
D
-4
16
Safety Features
• 4250V dc, 100 MΩ input-to-output isolation - pending
• (see Standards and Qualifications page)
Mechanical Features
Designed and Manufactured in the USA
Operational Features
•
•
•
•
• Industry standard full-brick form factor
• Size:
4.686” x 2.486” x .512”
119.0 x 63.1 x 13.0 mm
• Total weight: 9.9oz (280g)
• Flanged baseplate version available
High efficiency, 94% at full rated load current
Operating input voltage range: 16-40 V
Fixed frequency switching provides predictable EMI
No minimum load requirement
Protection Features
Control Features
•
•
•
•
•
• Fully isolated On/Off control
• Fully isolated active current sharing
Input under-voltage lockout
Output current limit and short circuit protection
Active back bias limit
Auto-recovery output over-voltage protection
Thermal shutdown
Screening/Qualification
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, F)
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
•
•
•
•
•
AS9100 and ISO 9001:2008 certified facility
Qualified to MIL-STD-810
Available with S-Grade or M-Grade screening
Pre-cap inspection per IPC-610, Class III
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
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 1
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
BLOCK DIAGRAM
6
INPUT
ISOLATION STAGE
REGULATION STAGE
7
CURRENT
SENSE
1
Vin(+)
Vout(+)
2
IN RTN
5
ISOLATION
UVLO
OVSD
CURRENT
LIMIT
A1
PRIMARY
CONTROL
ON/OFF
A2
9
ISOLATION BARRIER
GATE DRIVERS
OUT RTN
ISOLATION
SECONDARY
Gate Drive
and
OVP
ON/OFF
Return
A5
Share(-)
A7
Share(+)
A9
ISHARE COMMON
DATA COUPLING
TYPICAL CONNECTION DIAGRAM
Vin
External
Input
Filter
Vin(+ )
Electrolytic
Capacitor
ON /OFF(+ )
ON /OFF(-)
Vin(-)
Product # MCOTS-C-28-270-FZ
Vout(+ )
Phone 1-888-567-9596
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Vout(-)
Doc.# 005-0006646 Rev. 1
Cl o ad
11/05/2014
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Page 2
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
MCOTS-C-28-270-FZ ELECTRICAL CHARACTERISTICS
Tb = 25 °C, Vin = 28Vdc 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
-0.5
60
V
Continuous
Operating
40
V
Continuous
Operating Transient Protection
50
V
1 s transient, square wave
Isolation Voltage
Input to Output
4250
V dc
Input to Base-Plate
2300
V dc
Output to Base-Plate
2300
V dc
Operating Temperature
-55
+100
°C
Baseplate temperature
Storage Temperature
-65
+135
°C
Voltage at ON/OFF input pin
-2
18
V
INPUT CHARACTERISTICS
Operating Input Voltage Range
16
28
40
V
Input Under-Voltage Turn-On Threshold
14.8
15.6
V
Input Under-Voltage Turn-Off Threshold
13.8
14.5
V
Input Under-Voltage Hystersis
0.9
1
1.2
V
µF
Recommended External Input Capacitance
TBD
Typical ESR 1Ω, see Note 2
Input Filter Component Values (C\L\C)
0.1/.2/80
µF\µH\µF Internal values; see Figure E
Maximum Input Current
65.0
A
Vin min; in current limit
No-Load Input Current
700
TBD
mA
Disabled Input Current
10
TBD
mA
Response to Input Transient
TBD
mV
See Figure 12
Input Terminal Ripple Current
TBD
mA
RMS
Recommended Input Fuse
70
A
Fast acting external fuse recommended
OUTPUT CHARACTERISTICS
Output Voltage Set Point
267.30
270.00
272.70
V
Output Voltage Regulation
Over Line
1
TBD
%
Over Load
3
TBD
%
Over Temperature
TBD
TBD
mV
Total Output Voltage Range
260
280
V
Over sample, line, load, temperature & life
Output Voltage Ripple and Noise
20 MHz bandwidth; see Note 1
Peak-to-Peak
3
TBD
V
Full load (See Figure 10)
RMS
1
TBD
V
Full load
Operating Output Current Range
3.7
A
Subject to thermal derating
Output DC Current-Limit Inception
TBD
4.4
TBD
A
Output voltage 10% Low
Output DC Current-Limit Shutdown Voltage
135
V
Back-Drive Current Limit while Enabled
1.1
A
Negative current drawn from output
Back-Drive Current Limit while Disabled
TBD
mA
Negative current drawn from output
Maximum Output Capacitance
TBD
µF
Vout nominal at full load (resistive load)
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
TBD
mV
50% to 75% to 50% Iout max
Settling Time
600
µs
To within 0.1% Vout nom
Output Over-Voltage Protection
296
308
320
V
Over full temp range
EFFICIENCY
100% Load
94
%
50% Load
95
%
Note 1: Output is terminated with 1 µF ceramic and 15 µF low-ESR tantalum capacitors. For applications requiring reduced output voltage ripple and
noise, consult SynQor applications support
(e-mail: [email protected])
Note 2: An input capacitor with series resistance is necessary to provide system stability.
Note 3: Maximum Trim-up is 10%. Applying more than 6.2V between trim pin and Vout(-) may damage the unit.
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 3
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
MCOTS-C-28-270-FZ ELECTRICAL CHARACTERISTICS
Tb = 25 °C, Vin = 28Vdc 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.
DYNAMIC CHARACTERISTICS
Turn-On Transient
Turn-On Time
TBD
Start-Up Inhibit Time
360
400
Output Voltage Overshoot
0
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
100
Isolation Capacitance (input to output)
500
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
Maximum Baseplate Temperature, Tb
FEATURE CHARACTERISTICS
Switching Frequency
230
240
ON/OFF Control
Off-State Voltage
2.4
On-State Voltage
-1
ON/OFF Control
Input Resistance
3.1
Over-Temperature Shutdown OTP Trip Point
125
Over-Temperature Shutdown Restart Hysteresis
10
RELIABILITY CHARACTERISTICS
Calculated MTBF per MIL-HDBK-217F
TBD
Calculated MTBF per MIL-HDBK-217F
TBD
Note 1: Additional input to output isolation capacitance external to the module
Note 2: Do not apply a clock signal lower than specified frequency.
440
4250
Units
ms
ms
%
V dc
MΩ
pF
125
125
125
100
°C
°C
°C
°C
250
kHz
18
0.8
V
V
Notes & Conditions
Full load, Enable Transition to Vout=90% nom.
See Figure F
Maximum Output Capacitance
See Absolute Maximum Ratings
See Note 1
Package rated to 150 °C
UL rated max operating temp 130 °C
Application notes Figures A & B
kΩ
°C
°C
106 Hrs.
103 Hrs.
is recommended.
Average PCB Temperature
Ground Benign, 70°C Tb
Ground Mobile, 70°C Tb
STANDARDS COMPLIANCE
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
Pending
UL 60950-1/R:2011-12
Reinforced Insulation
CAN/CSA-C22.2 No. 60950-1/A1:2011
EN60950-1/A12:2011
CE Marked
2006/95/EC Low Voltage Directive
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-28-270-FZ
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 4
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
96
96
95
95
94
Efficiency (%)
Efficiency (%)
93
20 Vin
92
22 Vin
91
28 Vin
40 Vin
90
94
93
89
20V
92
88
28V
40V
87
86
0
1
2
3
91
-55⁰C
4
25⁰C
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Figure 2: Efficiency at nominal output voltage and 60% rated power vs. case
temperature for minimum, nominal, and maximum input voltage.
90
50
80
45
Power Dissipation (W)
Power Dissipation (W)
70
60
50
40
30
20 Vin
20
22 Vin
10
40 Vin
0
85⁰C
Case Temperature (ºC)
Load Current (A)
1
2
3
35
30
20V
25
28 Vin
0
40
28V
40V
20
-55⁰C
4
25⁰C
85⁰C
Case Temperature (ºC)
Load Current (A)
Figure 3: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at TCASE=25°C.
Figure 4: Power dissipation at nominal output voltage and 60% rated power vs.
case temperature for minimum, nominal, and maximum input voltage.
300
Data Pending
Output Voltage (V)
250
200
150
100
50
28 Vin
0
0
1
2
3
4
5
Load Current (A)
Figure 5: Maximum output current vs. base plate temperature (nominal input
voltage).
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
Figure 6: Output voltage vs. load current showing typical current limit curves. See
Current Limit section in the Application Notes.
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 5
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
Figure 7: Typical startup waveform with 0% load. Input voltage pre-applied.
Ch 1: Vout (100V/div). Ch2: ON/OFF Pin (2V/div). Horizontal Scale: 50ms/div
Figure 8: Turn-on transient at full resistive load and zero output capacitance
initiated by Vin. ON/OFF Pin previously low. Ch 1: Vin (10V/div). Ch2: Vout
(100V/div). Horizontal Scale: 50mSec/div
Figure 9: Input terminal current ripple, iC, at full rated output current and
nominal input voltage (1 A/div). Bandwidth: 20MHz. See Figure 17.
Figure 10: Output voltage ripple, Vout, at nominal input voltage and rated load
current (1 V/div). Load capacitance: 2.2µF X7R ceramic capacitors. Bandwidth:
20 MHz. See Figure 17.
Data Pending
Data Pending
Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1 A/µs). Load cap: 2.2µF X7R ceramic capacitor. Ch
1: Vout (10V/div), Ch 2: Iout (1A/div).
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
Figure 12: Output voltage response to step-change in input voltage (1000V/ms).
Ch 1: Vin (20V/div), Ch 2: Vout (10V/div).
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 6
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
BASIC OPERATION AND FEATURES
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 stepdown to achieve the 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. See Ordering Information page for available
thermal design options.
SynQor FZ full-brick converter uses the industry standard full-brick
footprint with a unique pin-out to accommodate high input current
and high output voltage.
On when switch is open
VIN (+)
VOUT (+)
+ON/OFF
5V
-ON/OFF
V OUT (-)
VIN (-)
On when switch is closed
VIN (+)
VOUT (+)
+ON/OFF
5V
-ON/OFF
V OUT (-)
VIN (-)
Figure A: Various Circuits for Driving the ON/OFF Pin
CONTROL FEATURES
ON/OFF(+) and ON/OFF(-) (Pin A1 and A2) - Remote ON/
OFF: The ON/OFF inputs, pins A1 and A2, permit the user to turn
the converter on or off. These two inputs are fully isolated from
both the input and the output side of the power converter, allowing
the user the option to reference on/off control to either the input
or the output potentials.
Opto
U1
3.01k
Pin A1
R1
C1
D1
100p
The user’s on/off control signal is applied between the ON/OFF(+)
pin and the ON/OFF(-) pins. Figure A details two possible circuits
for driving the ON/OFF pin. Figure B shows the cirucit internal to
the module that connects to the ON/OFF pins.
OUTPUT OVERVOLTAGE PROTECTION: The Output OverVoltage Protection circuit senses the voltage across the output
(Pins 7 and 9) to determine when it should trigger.
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.
Output Over-Current Protection (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 an
auto-restart mode. In this mode the unit will be off for 500 ms and
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 OverVoltage Protection” threshold*, then the unit will shut down.
Output Over-Voltage Protection (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) a release of a shortcircuit condition, or 2) a release of a current limit condition. Load
capacitance determines exactly how high the output voltage will
rise in response to these conditions. After 500 ms the converter
will automatically restart.
Over-Temperature Protection (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 “OverTemperature 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*.
Pin A2
Figure B: Internal ON/OFF Pin Circuitry
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
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Doc.# 005-0006646 Rev. 1
11/05/2014
Page 7
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
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 auto-restart
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
• Output Over-Current Protection
• Short Circuit Protection
* See Electrical Characteristics section.
APPLICATION CONSIDERATIONS
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.
Application Circuits: A typical circuit diagram, Figure D below
details the input filtering.
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.
Vin
External
Input
Filter
Output Filtering and External Output Capacitance: The
internal output 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 higher.
Thermal Considerations:
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.
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 then 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.
max
Pdiss
=
100ºC - TA
RTHBA
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.
For convenience, Thermal Derating Curves are provided in the
Technical Figures section.
Vin(+ )
Electrolytic
Capacitor
Vout(+ )
ON /OFF(+ )
ON /OFF(-)
Vin(-)
Vout(-)
Cl o ad
Il o ad
Figure D: Typical Application Circuit (negative logic unit, permanently enabled)
L
Vin(+)
C2
C1
Vin(_)
Figure E: Internal Input Filter Diagram (component values listed in Electrical Characteristics section)
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 8
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
Active Current Share Application Section
Overview: The FZ supports active current sharing. This feature can
be utilized by connecting two pins, SHARE(+) and SHARE(-), between
modules that are in parallel.
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).
• Input power pins and output power pins do not have to be tied
together between units, permitting the use of common-mode
chokes in the input filter of each module.
• 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.
Vin(+)
Vin(+)
470ηH(nom)
On/Off
On/Off Return
Elec.
Cap.
Share(+)
Share(-)
LOAD
≥10µF
Vin(-)
Vin(-)
Vin(+)
Vin(+)
470ηH(nom)
On/Off
On/Off Return
Elec.
Cap.
ENABLE
Share(+)
Share(-)
Vin(-)
≥10µF
Vin(-)
Up to 100 Units
Vin(+)
Vin(+)
470ηH(nom)
On/Off
On/Off Return
Elec.
Cap.
≥10µF
Share(+)
Share(-)
Vin(-)
Vin(-)
Figure F: Typical Application Circuit for Paralleling of Full-Featured Units with an Input Common-Mode Choke. If an input common-mode choke is used, Vin(-)
may be tied together either before or after the choke for each unit. 470 nH (nominal) inductor or an output common-mode choke is required. See Figure G for output
common-mode choke configuration.
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 9
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
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.
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.
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.
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.
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.
Common-Mode Filtering can be used on either the primary or
secondary side of the converter. Adding a common-mode choke at the
output eliminates the need for the 470 nH indcutor at the output of
shared units.
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
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.
Pins SHARE(+) and SHARE(-) are galvanically isolated internally to the
module. Thus the SHARE(+) and SHARE(-) pins may be connected to other
modules whose input and/or output returns are ac isolated from each other.
It is recommended that these signals should be rounted as a differential
pair near the Vin(-) or Vout(-) planes for optimal signal integrity.
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.
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.
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 the FZ (whose output voltage is 270V), it is
important to ensure that this resonant frequency is below the switching
frequency. A 470 nH inductor should be added to the output located
close to the module, in series with each converter output to damp this
resonance. 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 (see Figure G).
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 10
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
Vin(+)
Vin(+)
On/Off
On/Off Return
Elec.
Cap.
Share(+)
Share(-)
LOAD
Vin(-)
Vin(-)
Vin(+)
Vin(+)
On/Off
On/Off Return
Elec.
Cap.
Share(+)
Share(-)
Vin(-)
ENABLE
Vin(-)
Up to 100 Units
Vin(+)
Vin(+)
On/Off
On/Off Return
Elec.
Cap.
Share(+)
Share(-)
Vin(-)
Vin(-)
Figure G: Typical Application Circuit for Paralleling of Full-Featured Units with an Output Common-Mode Choke. See Figure F for configuration with an input
common-mode choke.
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 11
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
Mechanical Diagram
2.486 ±0.020 [63.14]±0.50]
2.000 [50.80]
SEATING PLANE HEIGHT
0.512 0.005
[ 13.00 0.12]
PIN EXTENSION
0.200 0.026
[ 5.09 0.66]
6 7
8 9 10
0.010 [0.25]
TOP VIEW
BOTTOM VIEW
0.079 x5
[2.00]
4.686 0.020
[119.02 0.50]
4.200
[106.68]
A1
A3
A5
A7
A9
4.200
[106.68]
A2
A4
A6
A8
A10
2.107
[53.53]
2
5
A1
A3
A5
A7
A9
M3 STANDOFF
x4
SEE NOTE 8
0.800 0.020
[20.32 0.50]
4
2
1
0.250 [6.35]
0.861 [21.86]
0.939 [23.86]
A2
A4
A6
A8
A10
NOTES
3
0.200 [5.08]
0.400 [10.16]
0.650 [16.51]
PIN DESIGNATIONS
1) Applied torque per screw should not exceed 6in-lb (0.7Nm)
2) Pins 1-4, B and 6-8 are 0.040” (1.02mm) dia. With 0.080”
(2.03mm) dia. Standoffs.
3) Pins 5 and 9 are 0.080” (2.03mm) dia. With 0.125” (3.18mm)
dia. Standoffs.
4) All pins: Material Copper Alloy
5) Finish: matte tin over nickel plate
6) Weight: 9.9oz (280g)
7)All dimensions in inches(mm)
8)Tolerances: X.XXIN +/-0.02 (X.Xmm +/-0.5mm)
X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
Pin
Name
1
2
4
5
7
9
A3
A4
A5
A6
Vin(+)
Vin(-)
Vin(+)
Vin(-)
+VOUT
-VOUT
ON/
OFF(+)
ON/
OFF(–)
Reserved
Reserved
SHARE(+)
Reserved
Reserved - Do Not Connect
Reserved - Do Not Connect
Active current share differential pair (Note 4)
Reserved - Do Not Connect
A7
SHARE(-)
Active current share differential pair (Note 1)
A1
A2
Function
Positive input voltage
Negative input voltage
Positive input voltage
Negative input voltage
Positive Output Voltage
Negative Return for +VOUT
Turn converter on/off, referenced to ON/OFF(-)
Fully isolated ground return for ON/OFF(+)
A8 Reserved
Reserved - Do Not Connect
A9 GND ISHR
Isolated Ground Reference for Pins A5 and A7
A10 Reserved
Reserved - Do Not Connect
Pin Designations Notes:
1 See Full-Feature Application Notes
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 12
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
Mil-COTS Qualification
Test Name
# Tested
(# Failed)
Visual, mechanical and electrical testing before, during and
15
after 1000 hour burn-in @ full load
(0)
Visual, mechanical and electrical testing before, during and
5
after shock and vibration tests
(0)
8
+85˚C, 95% RH, 1000 hours, 2 minutes on / 6 hours off
(0)
500 cycles of -55˚C to +100˚C
10
(30 minute dwell at each temperature)
(0)
15
15 pins
(0)
-65˚C to +110˚C across full line and load specifications in
7
5˚C steps
(0)
2
70,000 feet (21 km), see Note
(0)
Details
Life Testing
Shock-Vibration
Humidity
Temperature
Cycling
Solderability
DMT
Altitude
Consistent with MILSTD-883F Method
Consistent with MILSTD-883F Method 5005
Method 1005.8
MIL-STD-202,
Methods 201A & 213B
Method 1004.7
Method 1010.8
Condition A
Method 2003
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
Process Description
S-Grade
M-Grade
Baseplate Operating Temperature
-55˚C to +100˚C
-55˚C to +100˚C
Storage Temperature
-65˚C to +135˚C
-65˚C to +135˚C
●
●
Pre-Cap Inspection
IPC-610, Class III
Temperature Cycling
Method 1010, Condition B, 10 Cycles
Burn-In
100˚C Baseplate
12 Hours
96 Hours
100%
25˚C
-55˚C, +25˚C, +100˚C
MIL-STD-2008
●
●
Final Electrical Test
Final Visual Inspection
●
Mil-COTS MIL-STD-810G Qualification Testing
MIL-STD-810G Test
Fungus
Method
508.6
Description
Table 508.6-I
500.5 - Procedure I
Storage: 70,000ft. / 2 Hr. duration
500.5 - Procedure II
Operating; 70,000ft. / 2 Hr. duration; Ambient Temperature
Rapid Decompression
500.5 - Procedure III
Storage: 8,000ft. to 40,000ft.
Acceleration
513.6 - Procedure II
Operating - 15g's
Salt Fog
509.5
Storage
501.5 - Procedure I
Storage: 135°C / 3 hrs
501.5 - Procedure II
Operating: 100°C / 3 hrs
502.5 - Procedure I
Storage: -65C / 4 hrs
502.5 - Procedure II
Operating: -55C / 3 hrs
Temperature Shock
503.5 - Procedure I - C
Storage: -65C to 135C; 12 cycles
Rain
506.5 - Procedure I
Wind Blown Rain
Immersion
512.5 - Procedure I
Non-Operating
Humidity
507.5 - Procedure II
Aggravated cycle @ 95% RH (Figure 507.5-7 aggravated temp - humidity cycle, 15 cycles)
Random Vibration
514.6 - Procedure I
10-2000 Hz, PSD level of 1.5 g2/Hz(54.6grms), duration = 1 hr/axis
516.6 - Procedure I
20g's peak, 11ms, Functional Shock (Operating no load) (saw tooth)
516.6 - Procedure VI
514.6 - Category 14
510.5 - Procedure I
Bench Handling Shock
Rotary wing aircraft - helicopter, 4hrs/axis, 20g's (sine sweep from 10 - 500HZ)
Blowing Dust
510.5 - Procedure II
Blowing Sand
Altitude
High Temperature
Low Temperature
Shock
Sinusoidal vibration
Sand and Dust
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 13
MCOTS-C-28-270-FZ
Output: 270V
Current: 3.7A
Technical Specification
Ordering Information/ Part Numbering
Example MCOTS-C-28-270-FZ-N-M-F
Not all combinations make valid part numbers, please contact SynQor for availability. See the website for details.
Family
Product
Input Voltage
Output
Voltage
Heatsink
Option
Package
Screening
Level
N: Normal
Threaded
MCOTS
C: Converter
28: 16-40V
270:270V
FZ: Full Brick Zeta
F: Full Feature
(Active current
share)
S: S-Grade
F: Flanged
Options
M: M-Grade
D: Normal NonThreaded
APPLICATION NOTES
PATENTS
A variety of application notes and technical white papers can be downloaded
in pdf format from our website.
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.
Contact SynQor for further information and to order:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Product # MCOTS-C-28-270-FZ
Phone 1-888-567-9596
5,999,417
6,222,742
6,545,890
6,577,109
6,594,159
6,731,520
6,894,468
6,896,526
6,927,987
7,050,309
7,072,190
7,085,146
7,119,524
7,269,034
7,272,021
7,272,023
7,558,083
7,564,702
7,765,687
7,787,261
8,023,290
8,149,597
8,493,751
8,644,027
Warranty
SynQor offers a two (2) year limited warranty. Complete warranty information is listed on our website or is available upon request from SynQor.
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.
www.synqor.com
Doc.# 005-0006646 Rev. 1
11/05/2014
Page 14