MQBQ-270-28B Single Output

MQBQ-270-28B
Single Output
H igh R eliability DC-DC C onverter
230-400V
155-450V
28V
400W
95%@7A / 95%@14A
Continuous Input
Transient Input
Output
Output
Efficiency
O peration : -55ºC to
®
The MilQor series of high-reliability DC-DC converters
+125ºC
brings SynQor's field proven high-efficiency synchronous
rectifier technology to the Military/Aerospace industry.
SynQor's innovative QorSealTM packaging approach ensures
survivability in the most hostile environments. Compatible
with the industry standard format, these converters operate
at a fixed frequency, have no opto-isolators, and follow
conservative component derating guidelines. They are
designed and manufactured to comply with a wide range of
military standards.
-Y-HB
0-28B
7
2
Q
MQB
er
t
onver
4A
Bus C 8Vout @ 1
2
in
V
270
Design Process
MQBQ series converters are:
• Designed for reliability per NAVSO-P3641-A guidelines
• Designed with components derated per:
— MIL-HDBK-1547A
— NAVSO P-3641A
Qualification Process
MQBQ series converters are qualified to:
• MIL-STD-810F
— consistent with RTCA/D0-160E
• SynQor’s First Article Qualification
— consistent with MIL-STD-883F
• SynQor’s Long-Term Storage Survivability Qualification
• SynQor’s on-going life test
In-Line Manufacturing Process
•
•
•
•
•
•
AS9100 and ISO 9001:2008 certified facility
Full component traceability
Temperature cycling
Constant acceleration
24, 96, 160 hour burn-in
Three level temperature screening
Product # MQBQ-270-28B
Phone 1-888-567-9596
Designed & Manufactured in the USA
Featuring QorSeal™ Hi-Rel Assembly
Features
•
•
•
•
•
•
Fixed switching frequency
No opto-isolators
Parallel operation with droop current share
Clock synchronization
Continuous short circuit and overload protection
Input under-voltage and over-voltage shutdown
Specification Compliance
MQBQ series converters (with MQME filter) are designed to meet:
•
•
•
•
•
•
www.synqor.com
MIL-HDBK-704-7 (A through F)
RTCA/DO-160 Section 16, 17, 18
MIL-STD-1275 (B, D)
DEF-STAN 61-5 (part 6)/(5, 6)
MIL-STD-461 (C, D, E, F)
RTCA/DO-160(E, F, G) Section 22
Doc.# 005-0005734 Rev. B
11/07/13
Page 1
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
BLOCK DIAGRAM
1
IN RTN
2
12 SYNC OUT 2
CURRENT
SENSE
GATE DRIVERS
CONTROL
POWER
CASE
♦ CURRENT LIMIT
♦ SHORT CIRCUIT PROTECTION
♦ DUTY CONTROL
3
11 +VOUT
ISOLATION BARRIER
+VIN
10 +VOUT
GATE DRIVERS
ENA
4
SYNC OUT 1
5
MICROCONTROLLER
♦ OVLO
♦ UVLO
♦ DUTY
CONTROL
9 OUT RTN
8 OUT RTN
MAGNETIC
COUPLING
SYNC IN
6
7 OUT RTN
TYPICAL CONNECTION DIAGRAM
1
2
3
+
_
VSOURCE
4
open
means
on
5
6
+VIN
SYNC OUT 2
IN RTN
+VOUT
CASE
+VOUT
MQBQ
ENA
OUT RTN
SYNC OUT 1
OUT RTN
SYNC IN
OUT RTN
12
11
10
+
9
Load
8
_
7
Pin 5: Primary Referenced
Pin 12 : Secondary Referenced
Product # MQBQ-270-28B
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005734 Rev. B
11/07/13
Page 2
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
MQBQ-270-28B ELECTRICAL CHARACTERISTICS
Parameter
Min. Typ. Max. Units Notes & Conditions
Vin=270Vdc, Pout=400W, Tcase=25°C, Cload=0µF, free running (see
Note 9) unless otherwise specified.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Reverse Bias (Tcase = 125ºC)
Reverse Bias (Tcase = -55ºC)
Isolation Voltage (I/O to case, I to O)
Continuous
Transient (≤100µs)
Operating Case Temperature
Storage Case Temperature
Lead Temperature (20s)
Voltage at ENA
INPUT CHARACTERISTICS
Operating Input Voltage Range
“
Input Under-Voltage Shutdown
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Shutdown Voltage Hysteresis
Input Over-Voltage Shutdown
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Shutdown Voltage Hysteresis
Maximum Input Current
No Load Input Current (operating)
Disabled Input Current
Input Terminal Current Ripple (pk-pk)
OUTPUT CHARACTERISTICS
Output Voltage Set Point (Tcase = 25ºC)
Input / Output Voltage Ratio
Output Voltage Droop
Output Voltage Variation
Output Voltage Variation
Output Voltage Variation
Total Output Voltage Range
Output Voltage Ripple and Noise Peak to Peak
Operating Output Current Range
Operating Output Power Range
Output DC Current-Limit Inception
Maximum Output Capacitance
EFFICIENCY
Iout = 16 A (230 Vin)
Iout = 14 A (270 Vin)
Iout = 7 A (270 Vin)
Iout = 9.2 A (400 Vin)
Product # MQBQ-270-28B
-500
-800
-55
-65
-1.2
600
550
-0.8
-1.2
V
V
V
V
500
800
125
135
300
50
V
V
°C
°C
°C
V
230
155
270
270
400
450
V
V
147
142
1
155
150
5
163
157
10
V
V
V
408
401
4
422
412
9
447
438
14
2.5
40
4
200
V
V
V
A
mA
mA
mA
29.3
V
V/V
Ω
V
V
V
V
mV
A
W
A
µF
28
1
105
28.8
21.5
29.1
9.0
0.041
0.7
1.1
0.4
440
0
0
18.0
20.2
91
92
92
92
95
95
95
95
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1.0
1.5
0.8
48.5
14
400
22.2
1,000
(see Note 11)
See Note 1
HB Grade Products, See Notes 2 & 13
Continuous
Transient, 100 ms
See Note 3
1, 2, 3
See Note 5
1, 2, 3
1, 2, 3
1, 2, 3
See Note 3
Vin = 230V; Iout = 16A
Vin = 230V to 400V
Vin = 230V to 400V
Bandwidth = 100kHz to 20MHz; see Figure 14
Vin = 270V; Iout = 7A
Transformer turns ratio
Iout = 0A to 14A
Vin = 270V; Iout = 0 to 14A
Vin = 270V; Iout = 0 to 14A
Vin = 270V; Iout = 0 to 14A
Over line, load, temperature, & life
Bandwidth = 20MHz; Cload=0µF
Vin = 270V
Vin = 230V to 400V
See Note 4; Vin = 270 V
Iout ≤ half load resistive
1,
1,
1,
1,
1,
1,
2,
2,
2,
2,
2,
2,
1
3
3
3
3
3
3
1
1
2
3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
See Note 5
%
%
%
%
www.synqor.com
Group A
Subgroup
1, 2, 3
1, 2, 3
1
1, 2, 3
Doc.# 005-0005734 Rev. B
11/07/13
Page 3
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
MQBQ-270-28B ELECTRICAL CHARACTERISTICS (Continued)
Parameter
Min. Typ. Max. Units Notes & Conditions
Vin=270Vdc, Pout=400W, Tcase=25°C, Cload=0µF, free running (see
Note 9) unless otherwise specified.
ISOLATION CHARACTERISTICS
Isolation Voltage
Input RTN to Output RTN
Input Pin to Case
Any Output Pin to Case
Isolation Resistance (in rtn to out rtn)
Isolation Resistance (pin to case)
Isolation Capacitance (in rtn to out rtn)
FEATURE CHARACTERISTICS
Input/output Ripple Frequency (free running)
Synchronization Input
Frequency Range
Logic Level High
Logic Level Low
Duty Cycle
Synchronization Output
Pull Down Current
Duty Cycle
Enable Control (ENA)
Off-State Voltage
Module Off Pulldown Current
On-State Voltage
Module On Pin Leakage Current
Pull-Up Voltage
RELIABILITY CHARACTERISTICS
Calculated MTBF (MIL-STD-217F2)
GB @ Tcase = 70ºC
AIF @ Tcase = 70ºC
WEIGHT CHARACTERISTICS
Device Weight
Group A
Subgroup
(see Note 11)
Dielectric strength
500
500
500
100
100
V
V
V
MΩ
MΩ
nF
47
500
550
600
kHz
500
2.0
0
20
700
3.3
0.8
80
kHz
V
V
%
20
40
60
mA
%
0.8
80
2
3.2
20
4.8
4.5
V
µA
V
µA
V
2000
200
103 Hrs.
103 Hrs.
82.7
g
1
1
1
1
1
1
Switching devices run at half this frequency
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
See Note 5
VSYNC OUT = 0.8V
See Note 5
See Note 5
Current drain required to ensure module is off
Imax draw from pin allowed with module still on
See Figure A
See Note
See Note
See Note
See Note
1, 2, 3
5
5
5
5
Electrical Characteristics Notes
1. Converter will undergo input over-voltage shutdown.
2. Derate output power for continuous operation per Figure 5.
3. High or low state of input voltage must persist for about 200µs to be acted on by the shutdown circuitry.
4. Current Limit inception is defined as the point where the output voltage has dropped to 90% of its nominal value. Current limit inception is a function
of input voltage. See Current Limit discussion in Features Description section.
5. Parameter not tested but guaranteed to the limit specified.
6. Load current transition time ≥ 10µs.
7. Line voltage transition time ≥ 250µs.
8. Input voltage rise time ≥ 250µs.
9. Operating the converter at a synchronization frequency above the free running frequency will cause the converter’s efficiency to be slightly reduced
and it may also cause a slight reduction in the maximum output current/power available. For more information consult the factory.
10. After a disable or fault event, module is inhibited from restarting for 100ms. See Shut Down section of the Control Features description.
11. Only the ES and HB grade products are tested at three temperatures. The C grade products are tested at one temperature. Please refer to the
Construction and Environmental Stress Screening Options table for details.
12. These derating curves apply for the ES and HB grade products. The C grade product has a maximum case temperature of 70ºC.
13. The specified operating case temperature for ES grade products is -45ºC to 100ºC. The specified operating case temperature for C grade products
is 0ºC to 70ºC.
Product # MQBQ-270-28B
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005734 Rev. B
11/07/13
Page 4
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
95
95
90
90
85
85
Efficiency (%)
100
Efficiency (%)
100
80
75
70
75
Vin = 270V
5.0
10.0
Vin = 270V
Vin = 400V
65
Vin = 400V
0.0
Vin = 230V
70
Vin = 230V
65
60
80
60
-55ºC
15.0
25ºC
Load Current (A)
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at Tcase=25°C.
Figure 2: Efficiency vs. case temperature for minimum, nominal, and
maximum input voltage and 60% rated power.
24
24
20
20
Power Dissipation (W)
Power Dissipation (W)
125ºC
Case Temperature (ºC)
16
12
8
Vin = 230V
4
16
12
8
Vin = 230V
Vin = 270V
4
Vin = 270V
Vin = 400V
Vin = 400V
0
0.0
5.0
10.0
0
-55ºC
15.0
25ºC
Figure 3: Power dissipation vs. load current for minimum, nominal,
and maximum input voltage at Tcase=25°C.
45
14
400
40
12
350
6
150
Tj=145ºC
100
Tj=125ºC
2
35
45
55
65
75
85
95
105
115
125
135
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20
15
Vin = 230V
Vin = 270V
Vin = 400V
0
0
Case Temperature (ºC)
Product # MQBQ-270-28B
25
5
0
Figure 5: Output current and power derating curves vs. case
temperature at nominal input voltage and at TJ=105°C, 125°C, and
145°C.
30
10
50
Tj=105ºC
25
Output Voltage (V)
200
Pout (W)
250
8
0
35
300
10
Iout (A)
Figure 4: Power dissipation vs. case temperature for minimum,
nominal, and maximum input voltage and 60% rated power.
450
4
125ºC
Case Temperature (ºC)
Load Current (A)
2
4
6
8
10
12
Load Current (A)
14
16
18
20
Figure 6: Output voltage vs. load current, current limit curves for
minimum, nominal, and maximum input voltage at Tcase=25°C.
www.synqor.com
Doc.# 005-0005734 Rev. B
11/07/13
Page 5
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
45
0.7
Vin = 230V
40
Vin = 230V
0.6
Vin = 270V
Vin = 270V
Vin = 400V
Vin = 400V
Output Voltage Droop (V)
Output Voltage (V)
0.5
35
30
25
20
0
2
4
6
8
10
Load Current (A)
12
14
0.4
0.3
0.2
0.1
0.0
16
0
2
4
6
8
10
Load Current (A)
12
14
16
Figure 7 Output voltage vs. load current, regulation curves for
minimum, nominal, and maximum input voltage at Tcase=25°C.
Figure 8: Output voltage droop vs. load current for minimum,
nominal, and maximum input voltage at Tcase=25°C.
Figure 9: Turn-on transient at no load and 11uF output capacitance
initiated by ENA. Input voltage pre-applied. Ch 1:Vout (10V/div).
Ch2 : ENA (5V/div).
Figure 10: Turn-on transient at half resistive load and 500uF output
capacitance initiated by ENA. Input voltage pre-applied. Ch 1:Vout
(10V/div). Ch 2: ENA (5V/div).
Figure 11: Turn-on transient at full resistive load and 11uF output
capacitance initiated by ENA. Input voltage pre-applied. Ch 1:Vout
(10V/div). Ch 2: ENA (5V/div)
Figure 12: Turn-on transient at full resistive load and 11uF output
capacitance initiated by Vin. ENA previously high. Ch1 :Vout (10V/
div). Ch2 : Vin (100V/div)
Product # MQBQ-270-28B
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005734 Rev. B
11/07/13
Page 6
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
Figure 13: Output voltage response to step-change in load current
50%-100%-50% of Iout (max). Load capacitance: 1uF ceramic and
10uF 100mΩ ESR tantalum. Ch 1: Vout (1V/div). Ch 2: Iout (10A/
div).
Figure 14: Output voltage response to step-change in load current
10%-100%-10% of Iout (max). Load capacitance: 1uF ceramic and
10uF 100mΩ ESR tantalum. Ch 1: Vout (1V/div). Ch 2: Iout (10A/
div).
See
Figure
17
MQME
Filter
ic
See
Figure
18
MQBQ
Converter
VOUT
VSOURCE
Figure 15: Output voltage response to step-change in input voltage
230V-400V-230V in 250us. Load capacitance: 1uF ceramic and
10uF 100mΩ ESR tantalum. Ch 1: Vin (200V/div). Ch 2: Vout (20V/
div).
Figure 16: Test set-up diagram showing measurement points for
input terminal current ripple (Figure 17) and output voltage ripple
(Figure 18).
Figure 17: Input terminal current ripple, ic at full load and nominal
input voltage with SynQor MQ filter module (50mA/div). Bandwidth:
20MHz. See Figure 16.
Figure 18: Output voltage ripple, Vout, at nominal input voltage and
full load (50mV/div). Bandwidth: 20MHz. Load capacitance: 1uF
ceramic and 10uF 100mΩ ESR tantalum. See Figure 16.
Product # MQBQ-270-28B
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005734 Rev. B
11/07/13
Page 7
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
Figure 19: Rise of output voltage after the removal of a short circuit
across the output terminals. Rshort = 5mΩ. Ch 1: Vout (10V/div).
Ch 2: Iout (20A/div). Bandwidth: 20MHz.
Product # MQBQ-270-28B
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005734 Rev. B
11/07/13
Page 8
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
BASIC OPERATION AND FEATURES
The MQBQ Bus Converters use full bridge power conversion stage
to implement a DC transformer. The output voltage is proportional
to the input voltage by the transformer turns ratio. During steady
state operation, the primary and secondary switching devices
operate with effectively 50 % duty cycle (there is not PWM action).
The full bridge stage switches at a fixed frequency for predictable
EMI performance. Due to the push-pull nature of this stage it creates
a ripple at double its switching frequency. As a result, both the input
and the output of the converter have a fundamental ripple frequency
of about 550 kHz in the free-running mode.
Rectification of the isolation stage’s output is accomplished with
synchronous rectifiers. These devices, which are MOSFETs with a
very low resistance, dissipate far less energy than would Schottky
diodes. This is the primary reason why the MQBQ converter have
such high efficiency.
Besides improving efficiency, the synchronous rectifiers permit
operation down to zero load current. There is no longer a need
for a minimum load, as is typical for converters that use diodes for
rectification. The synchronous rectifiers actually permit a negative
load current to flow back into the converter’s output terminals if
the load is a source of short or long term energy. The MQBQ
converters do not limit the negative current that can flow from the
load back to the source. Operation in this mode for a prolonged
time is not recommended.
There is a control circuit on both the input and output sides of the
MQBQ converter that determines the conduction state of the power
switches. These circuits communicate with each other across the
isolation barrier through a magnetically coupled device. No optoisolators are used.
A separate bias supply provides power to both the input and output
control circuits. Among other things, this bias supply permits the
converter to operate indefinitely into a short circuit (hic-cup type
operation).
An input under-voltage lockout feature with hysteresis is provided,
as well as an input over-voltage shutdown. There is also an output
current limit that is nearly constant as the load impedance decreases
to a short circuit.
The MQBQ is allowed to run in current limit
mode for a short time before shutting down. When a load fault is
removed and the fault inhibit time has elapsed, the converter will go
through its normal soft start sequence.
The MQBQ converter’s control circuit does not implement an overtemperature shutdown.
The following sections describe the use and operation of additional
control features provided by the MQBQ converter.
CONTROL FEATURES
ENABLE: The MQBQ converter has one enable pin. The enable
pin must have a logic high level for the converter to be enabled. A
logic low will inhibit the converter.
The ENA pin (pin 4) is referenced with respect to the converter’s
input return (pin 2).
The enable pin can be used to turn the main power stage on and
off, but the bias supply is not controlled by the enable pin. If the
input voltage is above input under voltage lockout, the bias supply
will turn on and remain on until the input voltage drops below this
voltage.
The enable pin is internally pulled high so that an open connection
on the pin will enable the converter. Figure A shows the equivalent
circuit looking into the enable pin (primary referenced). It is TTL
compatible.
SHUT DOWN: The MQBQ converter will shut down in response
to only four conditions: ENA input low, VIN input below undervoltage lockout threshold, VIN input above over-voltage shutdown
threshold, or a prolonged over current / short circuit condition.
Following a shutdown event, there is a startup inhibit delay which
will prevent the converter from restarting for approximately 250ms.
After the 250ms delay elapses, if the enable input is high and the
input voltage is within the operating range, the converter will restart.
If the VIN input is brought down to nearly 0V and back into the
operating range, there is no startup inhibit, and the output voltage
will rise according to the “Turn-On Delay, Rising Vin” specification.
5V
82.5K
PIN4
PIN2
ENA1
10K
TO ENABLE
CIRCUITRY
IN RTN
Figure A: Circuit diagram shown for reference only, actual
circuit components may differ from values shown for
equivalent circuit.
Product # MQBQ-270-28B
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005734 Rev. B
11/07/13
Page 9
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
SYNCHRONIZATION:
The MQBQ converter’s switching
frequency can be synchronized to an external frequency source
that is in the 500 kHz to 700 kHz range. A pulse train at the
desired frequency should be applied to the SYNC IN pin (pin 6)
with respect to the INPUT RETURN (pin 2). This pulse train should
have a duty cycle in the 20% to 80% range. Its low value should
be below 0.8V to be guaranteed to be interpreted as a logic low,
and its high value should be above 2.0V to be guaranteed to be
interpreted as a logic high. The transition time between the two
states should be less than 300ns.
If the MQBQ converter is not to be synchronized, the SYNC IN pin
should be left open circuit. The converter will then operate in its
free-running mode at a frequency of approximately 550 kHz.
If, due to a fault, the SYNC IN pin is held in either a logic low or
logic high state continuously, the MQBQ converter will revert to its
free-running frequency.
The MQBQ converter also has two SYNC OUT pins (pin 5 and pin
12). The SYNC OUT 1 signal (primary referenced) can be used
to drive the SYNC IN pins of as many as ten (10) other MQBQ
converters. The pulse train coming out of SYNC OUT 1 has a duty
cycle of 50% and a frequency that matches the switching frequency
of the converter with which it is associated. This frequency is either
the free-running frequency if there is no synchronization signal
at the SYNC IN pin, or the synchronization frequency if there is.
SYNC OUT is also available referenced to the secondary side on
pin 12 (referenced to output return; pins 7, 8, or 9). The SYNC
OUT 2 signal can be used to synchronize down stream converters
connected to the output bus.
The SYNC OUT signal is available only when the DC input voltage
is above the input under voltage lockout and when the converter is
not inhibited through the ENA pin.
NOTE: An MQBQ converter that has its SYNC IN pin (primary
referenced) driven by the SYNC OUT pin (primary referenced) of
a second MQBQ converter will have its start of its switching cycle
delayed approximately 180 degrees relative to that of the second
converter.
Figure B shows the equivalent circuit looking into the SYNC IN pin
/ SYNC OUT 1 pin referenced to the primary. Figure C shows the
equivalent circuit looking into the SYNC OUT 2 pin (secondary side
reference).
CURRENT SHARE: Like most Bus Converters, several MQBQ's
can be placed in parallel to achieve either a higher total load power
or N+1 redundancy. As long as the MQBS' share, both, the same
input source and output load, the total load will evenly spit between
MQBQ's as a result of its natural voltage droop characteristic.
INPUT UNDER-VOLTAGE LOCKOUT: The MQBQ converter
has an under-voltage lockout feature that ensures the converter will
be off if the input voltage is too low. The threshold of input voltage
at which the converter will turn on is higher that the threshold at
which it will turn off. In addition, the MQBQ converter will not
respond to a state of the input voltage unless it has remained in
that state for more than about 200µs. This hysteresis and the delay
ensure proper operation when the source impedance is high or in
a noisy environment.
Product # MQBQ-270-28B
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5V
5K
SYNC OUT 1
PIN 5
5V
5K
PIN 6
SYNC IN
PIN 2
From SYNC
CIRCUITRY
Open
Collector
Output
To SYNC
CIRCUITRY
5K
IN RTN
Primary referenced
Synchronization Interface
Figure B: SYNC IN / SYNC OUT (1) equivalent circuits referenced
to the input return pin (IN RTN).
OPEN
COLLECTOR
OUTPUT
From SYNC
CIRCUITRY
5V
5K
SYNC OUT 2
OUT RTN
Secondary Referenced
Synchronization Interface
PIN
12
PINS
7,8,9
Figure C: Equivalent circuit looking into SYNC OUT 2 pin with
respect to the OUT RTN (output return) pin.
INPUT OVER-VOLTAGE SHUTDOWN: The MQBQ converter
also has an over-voltage feature that ensures the converter will be
off if the input voltage is too high. It also has a hysteresis and time
delay to ensure proper operation.
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.
THERMAL CONSIDERATIONS: Figure 5 shows the suggested
Power Derating Curves for this converter as a function of the case
temperature and the maximum desired power MOSFET junction
temperature. All other components within the converter are cooler
than its hottest component, which at full power is no more than 20ºC
higher than the case temperature directly below this component.
The Mil-HDBK-1547A component derating guideline calls for a
maximum component temperature of 105ºC. Figure 5 therefore
has one power derating curve that ensures this limit is maintained.
It has been SynQor’s extensive experience that reliable long-term
converter operation can be achieved with a maximum component
temperature of 125ºC. In extreme cases, a maximum temperature of
145ºC is permissible, but not recommended for long-term operation
where high reliability is required. Derating curves for these higher
temperature limits are also included in Figure 5.
www.synqor.com
Doc.# 005-0005734 Rev. B
11/07/13
Page 10
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
When the converter is mounted on a metal plate, the plate will help
to make the converter’s case bottom a uniform temperature. How
well it does so depends on the thickness of the plate and on the
thermal conductance of the interface layer (e.g. thermal grease,
thermal pad, etc.) between the case and the plate. Unless this is
done very well, it is important not to mistake the plate’s temperature
for the maximum case temperature. It is easy for them to be as much
as 5-10ºC different at full power and at high temperatures. It is
suggested that a thermocouple be attached directly to the converter’s
case through a small hole in the plate when investigating how hot
the converter is getting. Care must also be made to ensure that
there is not a large thermal resistance between the thermocouple
and the case due to whatever adhesive might be used to hold the
thermocouple in place.
REVERSE CURRENT OPERATION: Converters that use MOSFETs
as synchronous rectifiers are capable of drawing a negative current
from the load if the load is a source of short- or long-term energy.
This negative current is referred to as a “back-drive current”.
During steady state operation the MQBQ converters do not have
any protection feature that would limit the back-drive current.
Therefore, the MQBQ module will allow unlimited amount of
current to flow from the output to the input source when the output is
raised above the expected steady state voltage for any given input
voltage. Prolonged operation of the MQBQ converter in this mode
can result in permanent damage. The MQBQ converters do have
the necessary circuitry to start-up and shut down into a back-drive
condition (preexisting voltage at the output pins), as long as the
voltage at the output does not exceed the expected steady state
output voltage for any given input voltage.
Product # MQBQ-270-28B
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005734 Rev. B
11/07/13
Page 11
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
CONSTRUCTION AND ENVIRONMENTAL STRESS SCREENING OPTIONS
Screening
C-Grade
Consistent with
MIL-STD-883F
(
Element Evaluation
Internal Visual
*
specified from
0 ºC to +70 ºC
No
ES-Grade
) (
specified from
-45 ºC to +100 ºC
Yes
HB-Grade
) (
specified from
-55 ºC to +125 ºC
Yes
Yes
Yes
Yes
)
Temperature Cycle
Method 1010
No
Condition B
(-55 ºC to +125 ºC)
Condition C
(-65 ºC to +150 ºC)
Constant Acceleration
Method 2001
(Y1 Direction)
No
500g
Condition A
(5000g)
Burn-in
Method 1015
24 Hrs @ +125 ºC
96 Hrs @ +125 ºC
160 Hrs @ +125 ºC
+25 ºC
-45, +25, +100 ºC
-55, +25, +125 ºC
Full QorSeal
Full QorSeal
Full QorSeal
Final Electrical Test
Method 5005 (Group A)
Mechanical Seal,
Thermal, and
Coating Process
External Visual
2009
Construction Process
*
Yes
Yes
QorSeal
QorSeal
QorSeal
* Per IPC-A-610 Class 3
MilQor converters and filters are offered in three variations of environmental stress screening options. All MilQor converters use SynQor’s proprietary
QorSeal™ Hi-Rel assembly process that includes a Parylene-C coating of the circuit, a high performance thermal compound filler, and a nickel
barrier gold plated aluminum case. Each successively higher grade has more stringent mechanical and electrical testing, as well as a longer burn-in
cycle. The ES- and HB-Grades are also constructed of components that have been procured through an element evaluation process that pre-qualifies
each new batch of devices.
Product # MQBQ-270-28B
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005734 Rev. B
11/07/13
Page 12
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
1
2
3
4
5
6
SEE NOTE 7
+VIN
12
11
10
9
8
7
SYNC OUT 2
IN RTN
+VOUT
CASE
MQBQ-270-28B-X-HB
ENA
BUS CONVERTER
270Vin 28Vout @ 14A
+VOUT
OUT RTN
MADE IN USA
SYNC OUT 1
S/N 0000000 D/C 3211-301 CAGE 1WX10
SYNC IN
OUT RTN
OUT RTN
0.250 [6.35]
1.50 [38.1]
1.260
[32.00]
0.040 [1.02]
PIN
2.50 [63.50]
2.760 [70.10]
3.00 [76.2]
0.22 [5.6]
0.228 [5.79]
0.390 [9.91]
SEE NOTE 7
6
+VIN
SYNC OUT 2
IN RTN
+VOUT
MQBQ-270-28B-U-HB
CASE
+VOUT
BUS CONVERTER
270Vin 28Vout @ 14A
ENA
SYNC OUT 1
SYNC IN
0.050 [1.27]
0.128 [3.25]
2.96 [75.2]
1
2
3
4
5
0.200 [5.08]
TYP. NON-CUM.
OUT RTN
MADE IN USA
S/N 0000000 D/C 3205-301 CAGE 1WX10
OUT RTN
OUT RTN
12
11
10
9
8
7
2.50 [63.50]
2.76 [70.10]
3.00 [76.20]
Case X
0.250 [6.35]
0.200 [5.08]
TYP.
NON-CUM.
1.50 [32.10]
1.260
[32.00]
0.040
[1.02]
PIN
0.050 [1.27]
0.42
[10.7]
0.28 [3.25]
0.220 [5.59]
2.80 [71.1]
0.390 [9.91]
PIN DESIGNATIONS
NOTES
1)
Pins 0.040’’ (1.02mm) diameter
2)
Pins Material: Copper
Finish: Gold over Nickel plate
3)
All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
4)
Weight: 2.9 oz (82.7 g) typical
5)
Workmanship: Meets or exceeds IPC-A-610C Class III
6)
Print Labeling on Top Surface per Product Label Format Drawing
7)
Pin 1 identification hole, not intended for mounting
Product # MQBQ-270-28B
Case U
Phone 1-888-567-9596
Pin # Function
www.synqor.com
1
2
3
4
5
6
+ VIN
IN RTN
CASE
ENA
SYNC OUT 1
SYNC IN
Pin # Function
7
8
9
10
11
12
OUT RTN
OUT RTN
OUT RTN
+ VOUT
+ VOUT
SYNC OUT 2*
* Secondary Referenced
Doc.# 005-0005734 Rev. B
11/07/13
Page 13
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
0.300 [7.62]
0.140 [3.56]
1.150 [29.21]
0.250 [6.35]
TYP
1
2
3
4
5
6
+VIN
SYNC OUT 1
+VOUT
IN RTN
MQBQ-270-28B-Y-HB
CASE
BUS CONVERTER
270Vin 28Vout @ 14A
ENA
SYNC OUT 1
SYNC IN
+VOUT
OUT RTN
MADE IN USA
S/N 0000000 D/C 3211-301 CAGE 1WX10
OUT RTN
OUT RTN
1.750 [44.45]
12
2.000
11
[50.80]
10
1.50
9 [38.1]
8
1.750
7
[44.45]
0.250 [6.35]
0.200 [5.08]
TYP. NON-CUM.
0.040 [1.02]
PIN
0.050 [1.27]
0.22 [5.6]
0.375 [9.52]
2.50 [63.5]
2.96 [75.2]
0.228 [5.79]
0.390 [9.91]
Case Y
Case Z
(variant of Y)
0.250 [6.35]
Case W
(variant of Y)
0.250 [6.35]
0.200 [5.08]
TYP. NON-CUM.
0.200 [5.08]
TYP. NON-CUM.
0.040 [1.02]
PIN
0.040 [1.02]
PIN
0.22 [5.6]
0.050 [1.27]
0.42 [10.7]
0.36 [9.14]
0.050 [1.27]
0.22 [5.6]
2.80 [71.1]
0.525 [13.33]
0.390
[9.91]
0.525 [13.33]
0.390
[9.91]
2.80 [71.1]
PIN DESIGNATIONS
NOTES
1)
Pins 0.040’’ (1.02mm) diameter
2)
Pins Material: Copper
Finish: Gold over Nickel plate
3)
All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
4)
Weight: 2.9 oz (82.7 g) typical
5)
Workmanship: Meets or exceeds IPC-A-610C Class III
6)
Print Labeling on Top Surface per Product Label Format Drawing
7)
Pin 1 identification hole, not intended for mounting
Product # MQBQ-270-28B
Phone 1-888-567-9596
Pin # Function
www.synqor.com
1
2
3
4
5
6
+ VIN
IN RTN
CASE
ENA
SYNC OUT 1
SYNC IN
Pin # Function
7
8
9
10
11
12
OUT RTN
OUT RTN
OUT RTN
+ VOUT
+ VOUT
SYNC OUT 2*
* Secondary Referenced
Doc.# 005-0005734 Rev. B
11/07/13
Page 14
MQBQ-270-28B
Output: 28V
Current: 14A
Technical Specification
PART NUMBERING SYSTEM
The part numbering system for SynQor’s MilQor DC-DC converters follows the format shown in the table below.
Model
Name
Nominal Input Voltage
Range
Output Voltage(s)
Nominal Output Voltage
28
270
MQBQ
Package Outline/
Pin Configuration
Screening
Grade
U
X
Y
W
Z
C
ES
HB
28B
Not all combinations make valid part numbers, please contact SynQor for availability. See the Product Summary web page for more options.
Example:
MQBQ-270-28B–Y–ES
APPLICATION NOTES
A variety of application notes and technical white papers can be downloaded in pdf format from the SynQor website.
PATENTS
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.
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
Contact SynQor for further information and to order:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # MQBQ-270-28B
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Phone 1-888-567-9596
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.# 005-0005734 Rev. B
11/07/13
Page 15