MQFL-28V-3R3S [SYNQOR]
HIGH RELIABILITY DC-DC CONVERTER; 高可靠性DC-DC转换器
| 型号： | MQFL-28V-3R3S |
| 厂家： | 
SYNQOR WORLDWIDE HEADQUARTERS |
| 描述： | HIGH RELIABILITY DC-DC CONVERTER |
| 文件： | 总19页 (文件大小：844K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MQFL-28V-3R3S
Single Output
HIGH RELIABILITY DC-DC CONVERTER
16-40V
5.5-50V
3.3V
30A
89% @ 15A / 88% @ 30A
Continuous Input
Transient Input
Output
Output
Efficiency
®
The MilQor series of high-reliability DC/DC converters
brings SynQor’s field proven high-efficiency synchronous
rectifier technology to the Military/Aerospace industry.
SynQor’s innovative QorSeal™ 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.
-HB
-3R3S-Y
30A
MQFL-28V
out @
DC/DC CONVERTER
in 3.3V
28V
Meets all -704 and -1275B under-voltage transients
Design Process
MQFL series converters are:
• Designed for reliability per NAVSO-P3641-A guidelines
D
F
ESIGNED & MANUFACTURED IN THE USA
EATURING OR -REL SSEMBLY
EAL™ H
Q
S
I
A
• Designed with components derated per:
— MIL-HDBK-1547A
Features
— NAVSO P-3641A
• Fixed switching frequency
• No opto-isolators
• Parallel operation with current share
• Remote sense
• Clock synchronization
• Primary and secondary referenced enable
Qualification Process
MQFL series converters are qualified to:
• MIL-STD-810F
— consistent with RTCA/D0-160E
• SynQor’s First Article Qualification
• Continuous short circuit and overload protection
• Input under-voltage lockout/over-voltage shutdown
— consistent with MIL-STD-883F
• SynQor’s Long-Term Storage Survivability Qualification
• SynQor’s on-going life test
Specification Compliance
In-Line Manufacturing Process
MQFL series converters (with MQME filter) are designed to meet:
• MIL-HDBK-704-8 (A through F)
• RTCA/DO-160E Section 16
• MIL-STD-1275B
• AS9100 and ISO 9001:2000 certified facility
• Full component traceability
• Temperature cycling
• DEF-STAN 61-5 (part 6)/5
• MIL-STD-461 (C, D, E)
• RTCA/DO-160E Section 22
• Constant acceleration
• 24, 96, 160 hour burn-in
• Three level temperature screening
Product # MQFL-28V-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005109 Rev. A
04/14/09
Page 1
MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
BLOCK DIAGRAM
BOOST
REGULATION STAGE
ISOLATION STAGE
CONVERTER
SWITCHES
AND
7
+Vout
CURRENT
SENSE
1
+Vin
CONTROL
2
8
INPUT
RETURN
OUTPUT
RETURN
CASE
GATE DRIVERS
GATE DRIVERS
3
STABILITY
CURRENT
LIMIT
12
UVLO
ENABLE 2
4
MAGNETIC
ENABLE 1
11
PRIMARY
CONTROL
SECONDARY
CONTROL
SHARE
5
SYNC OUT
DATA COUPLING
10
+ SENSE
6
SYNC IN
9
−
SENSE
BIAS POWER
CONTROL
POWER
TRANSFORMER
TYPICAL CONNECTION DIAGRAM
1
12
11
10
9
+VIN
ENA 2
open
means
on
External bulk capacitor
2
3
4
5
6
IN RTN
SHARE
+ SNS
STABILITY
ENA 1
+
-
MQFL
RSTABILITY
CSTABILITY
+
-
Load
28 Vdc
- SNS
open
means
on
8
SYNC OUT
SYNC IN
OUT RTN
+VOUT
7
Product # MQFL-28V-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005109 Rev. A
04/14/09
Page 2
MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
MQFL-28V-3R3S ELECTRICAL CHARACTERISTICS
Parameter
Min. Typ. Max. Units Notes & Conditions
Group A
Subgroup
Vin=28V dc ±5%, Iout=30A, CL=0μF, free running (see Note 10)
boost-converter non-operational unless otherwise specified
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
60
60
-0.8
-1.2
V
V
V
V
Operating
See Note 1
See Note 2
Reverse Bias (Tcase = 125ºC)
Reverse Bias (Tcase = -55ºC)
Isolation Voltage (I/O to case, I to O)
Continuous
-500
-800
-55
500
800
135
135
300
50
V
V
°C
°C
°C
V
Transient (≤100μs)
Operating Case Temperature
Storage Case Temperature
Lead Temperature (20s)
-65
Voltage at ENA1, ENA2
-1.2
INPUT CHARACTERISTICS
Operating Input Voltage Range
"
16
28
28
40
50
V
V
Continuous
1, 2, 3
4, 5, 6
5.5
Transient, 1s; see Under-Voltage Transient Profile
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Input Over-Voltage Shutdown
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Shutdown Voltage Hysteresis
Maximum Input Current
See Note 3
14.75 15.50 16.00
13.80 14.40 15.00
0.50
V
V
V
1, 2, 3
1, 2, 3
1, 2, 3
1.10
1.80
See Note 3
54.0
50.0
2.0
56.8
51.4
5.3
60.0
54.0
8.0
8
170
5
V
V
V
A
mA
mA
mA
mA
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Vin = 16V; Iout = 30A
No Load Input Current (operating)
Disabled Input Current (ENA1)
Disabled Input Current (ENA2)
Input Terminal Current Ripple (pk-pk)
OUTPUT CHARACTERISTICS
Output Voltage Set Point (Tcase = 25ºC)
Output Voltage Set Point Over Temperature
Output Voltage Line Regulation
Output Voltage Load Regulation
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
Short Circuit Output Current
Back-Drive Current Limit while Enabled
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
DYNAMIC CHARACTERISTICS
Output Voltage Deviation Load Transient
For a Pos. Step Change in Load Current
For a Neg. Step Change in Load Current
Settling Time (either case)
Output Voltage Deviation Line Transient
For a Pos. Step Change in Line Voltage
For a Neg. Step Change in Line Voltage
Settling Time (either case)
Turn-On Transient
110
2
25
80
Vin = 16V, 28V, 50V
Vin = 16V, 28V, 50V
Bandwidth = 100kHz – 10MHz; see Figure 14
50
120
3.27
3.25
-20
12
3.23
3.30
3.30
0
16
3.30
15
3.33
3.35
20
V
V
mV
mV
V
mV
A
W
A
A
A
Vout at sense leads
1
2, 3
"
" ; Vin = 16V, 28V, 40V; Iout=30A
" ; Vout @ (Iout=0A) - Vout @ (Iout=30A)
"
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
See Note 5
22
3.37
60
Bandwidth = 10MHz; CL=11μF
0
0
31
31
30
100
42
36
37
10
10
See Note 4
Vout ≤ 1.2V
43
75
10,000
mA
μF
See Note 6
-400
-250
250
100
mV
mV
μs
Total Iout step = 15A‹-›30A, 3A‹-›15A; CL=11μF
4, 5, 6
4, 5, 6
4, 5, 6
400
250
"
See Note 7
Vin step = 16V‹-›50V; CL=11μF; see Note 8
-350
-350
350
350
500
mV
mV
μs
"
"
4, 5, 6
4, 5, 6
See Note 5
250
See Note 7
Output Voltage Rise Time
Output Voltage Overshoot
Turn-On Delay, Rising Vin
6
0
5.5
3.0
1.5
10
2
8.0
6.0
3.0
ms
%
ms
ms
ms
Vout = 0.3V-›3.0V
4, 5, 6
See Note 5
4, 5, 6
4, 5, 6
4, 5, 6
ENA1, ENA2 = 5V; see Notes 9 & 12
ENA2 = 5V; see Note 12
ENA1 = 5V; see Note 12
Turn-On Delay, Rising ENA1
Turn-On Delay, Rising ENA2
EFFICIENCY
Iout = 30A (16Vin)
84
87
84
85
83
84
89
90
88
89
87
87
16
16
%
%
%
%
%
%
W
W
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Iout = 15A (16Vin)
Iout = 30A (28Vin)
Iout = 15A (28Vin)
Iout = 30A (40Vin)
Iout = 15A (40Vin)
Load Fault Power Dissipation
Short Circuit Power Dissipation
32
34
Iout at current limit inception point; See Note 4
Vout ≤ 1.2V
Product # MQFL-28V-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005109 Rev. A
04/14/09
Page 3
MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
MQFL-28V-3R3S ELECTRICAL CHARACTERISTICS (Continued)
Parameter
Min. Typ. Max. Units Notes & Conditions
Group A
Subgroup
Vin=28V dc ±5%, Iout=30A, CL=0μF, free running (see Note 10)
boost-converter non-operational unless otherwise specified
ISOLATION CHARACTERISTICS
Isolation Voltage
Dielectric strength
Input RTN to Output RTN
Any Input Pin to Case
500
500
500
100
100
V
V
1
1
1
1
1
1
Any Output Pin to Case
Isolation Resistance (in rtn to out rtn)
Isolation Resistance (any pin to case)
Isolation Capacitance (in rtn to out rtn)
FEATURE CHARACTERISTICS
Switching Frequency (free running)
Synchronization Input
V
MΩ
MΩ
nF
44
500
550
600
kHz
1, 2, 3
Frequency Range
500
2.0
-0.5
20
600
10
0.8
80
kHz
V
V
%
1, 2, 3
1, 2, 3
1, 2, 3
Logic Level High
Logic Level Low
Duty Cycle
See Note 5
Synchronization Output
Pull Down Current
Duty Cycle
20
25
mA
%
VSYNC OUT = 0.8V
Output connected to SYNC IN of other MQFL unit
See Note 5
See Note 5
75
Enable Control (ENA1 and ENA2)
Off-State Voltage
Module Off Pulldown Current
On-State Voltage
Module On Pin Leakage Current
Pull-Up Voltage
0.8
V
μA
V
μA
V
1, 2, 3
See Note 5
1, 2, 3
See Note 5
1, 2, 3
80
2
Current drain required to ensure module is off
20
4.5
Imax drawn from pin allowed, module on
See Figure A
3.2
4.0
BOOST-CONVERTER OPERATION
Input Voltage Arming Value
Switching Frequency
Input Terminal Current Ripple (RMS)
Total Converter Efficiency
Iout = 15A (10Vin)
17.5
600
18.0
670
1
18.8
740
V
kHz
A
1, 2, 3
1, 2, 3
Vin = 16V; Iout = 30A
85
87
87
%
%
%
1, 2, 3
1, 2, 3
1, 2, 3
Iout = 15A (16Vin)
Iout = 30A (16Vin)
RELIABILITY CHARACTERISTICS
Calculated MTBF (MIL-STD-217F2)
GB @ Tcase = 70ºC
3
2200
390
TBD
10 Hrs.
3
AIF @ Tcase = 70ºC
10 Hrs.
3
Demonstrated MTBF
10 Hrs.
WEIGHT CHARACTERISTICS
Device Weight
79
g
Electrical Characteristics Notes
1. Converter will undergo input over-voltage shutdown.
2. Derate output power to 50% of rated power at Tcase = 135ºC (see Figure 5).
3. High or low state of input voltage must persist for about 200μs to be acted on by the lockout or shutdown circuitry.
4. Current limit inception is defined as the point where the output voltage has dropped to 90% of its nominal value.
5. Parameter not tested but guaranteed to the limit specified.
6. Load current transition time ≥ 10μs.
7. Settling time measured from start of transient to the point where the output voltage has returned to ±1% of its final value.
8. Line voltage transition time ≥ 100μs.
9. Input voltage rise time ≤ 250μs.
10. 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.
11. SHARE pin outputs a power failure warning pulse during a fault condition. See Current Share section of the Control Features description.
12. After a disable or fault event, module is inhibited from restarting for 300ms. See Shut Down section of the Control Features description.
13. 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.
14. These derating curves apply for the ES- and HB- grade products. The C- grade product has a maximum case temperature of 100ºC and a maximum
junction temperature rise of 20ºC above Tcase.
Product # MQFL-28V-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005109 Rev. A
04/14/09
Page 4
MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
Under-Voltage Transient Profile
Boost-Converter is armed when Vin
exceeds this value
V
ARM (~18 V)
Boost-Converter Operational Area
dV 0.1V
≤
VIN
dt
μs
5.5 V
0
1.5
15
Time (s)
Under-Voltage Transient Profile showing when the boost-converter is guaranteed to be operational. The boost-converter must
first be armed by having V > VARM. A new under-voltage transient can occur after a delay equal to four times the duration
IN
of the previous transient if the boost-converter is rearmed.
Note:
This Under-Voltage Transient Profile is designed to comply (with appropiate margins) with all initial-engagement surges, start-
ing or cranking voltage transients and under-voltage surges specified in:
• MIL-STD-704-8 (A through F)
• RTCA/DO-160E
• MIL-STD-1275B
• DEF-STAN 61-5 (part 6)/5 (operational portions)
Product # MQFL-28V-3R3S
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04/14/09
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MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
100
95
90
85
80
75
70
65
60
100
95
90
85
80
75
70
65
60
16 Vin
16 Vin
28 Vin
40 Vin
28 Vin
40 Vin
-55ºC
25ºC
125ºC
0
3
6
9
12
15
18
21
24
27
30
Load Current (A)
Case Temperature (ºC)
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 Tcase=25°C.
case temperature for input voltage of 16V, 28V, and 40V.
20
18
16
14
12
10
8
20
18
16
14
12
10
8
6
6
16 Vin
16 Vin
4
4
2
0
28 Vin
28 Vin
40 Vin
40 Vin
2
0
-55ºC
25ºC
125ºC
0
3
6
9
12
15
18
21
24
27
30
Load Current (A)
Case Temperature (ºC)
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 input voltage of 16V, 28V, and 40V.
4
3.5
3
35
30
25
20
15
10
5
117
100
83
67
50
33
17
0
2.5
2
1.5
1
Tjmax = 105ºC
Tjmax = 125ºC
Tjmax = 145ºC
0.5
28 Vin
0
0
0
3
6
9
12
15
18
21
24
27
30
33
36
39
25
45
65
85
105
125 135 145
Load Current (A)
Case Temperature (ºC)
Figure 6: Output voltage vs. load current showing typical current
limit curves.
Figure 5: Output Current / Output Power derating curve as a
function of Tcase and the Maximum desired power MOSFET junction
temperature at Vin = 28V (see Note 14).
Product # MQFL-28V-3R3S
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04/14/09
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:
Technniiccaall SSppeecciiffiiccaattiioonn
Figure 7: Turn-on transient at full resistive load and zero output
capacitance initiated by ENA1. Input voltage pre-applied. Ch 1:
Vout (1V/div). Ch 2: ENA1 (5V/div).
Figure 8: Turn-on transient at full resistive load and 10mF output
capacitance initiated by ENA1. Input voltage pre-applied. Ch 1:
Vout (1V/div). Ch 2: ENA1 (5V/div).
Figure 10: Turn-on transient at full resistive load and zero output
capacitance initiated by Vin. ENA1 and ENA2 both previously high.
Ch 1: Vout (1V/div). Ch 2: Vin (10V/div).
Figure 9: Turn-on transient at full resistive load and zero output
capacitance initiated by ENA2. Input voltage pre-applied. Ch 1:
Vout (1V/div). Ch 2: ENA2 (5V/div).
Figure 11: Output voltage response to step-change in load current
50%-100%-50% of Iout (max). Load cap: 1μF ceramic cap and
10μF, 100mΩ ESR tantalum cap. Ch 1: Vout (200mV/div). Ch 2: Iout
(20A/div).
Figure 12: Output voltage response to step-change in load current 0%-
50%-0% of Iout (max). Load cap: 1μF ceramic cap and 10μF, 100mΩ
ESR tantalum cap. Ch 1: Vout (200mV/div). Ch 2: Iout (20A/div).
Product # MQFL-28V-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005109 Rev. A
04/14/09
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MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
See Fig. 16
See Fig. 15
iC
MQME
Filter
MQFL
Converter
VOUT
VSOURCE
10µF,
1µF
ceramic
100m
ESR
Ω
capacitor
capacitor
Figure 14: Test set-up diagram showing measurement points for
Input Terminal Ripple Current (Figure 15) and Output Voltage Ripple
(Figure 16).
Figure 13: Output voltage response to step-change in input voltage
(16V - 50V - 16V). Load cap: 10μF, 100mΩ ESR tantalum cap and 1μF
ceramic cap. Ch 1: Vout (200mV/div). Ch 2: Vin (20V/div).
Figure 15: Input terminal current ripple, ic, at full rated output current
and nominal input voltage with SynQor MQ filter module (50mA/div).
Bandwidth: 20MHz. See Figure 14.
Figure 16: Output voltage ripple, Vout, at nominal input voltage and
rated load current (20mV/div). Load capacitance: 1ꢀF ceramic capacitor
and 10ꢀF tantalum capacitor. Bandwidth: 10MHz. See Figure 14.
Figure 17: Rise of output voltage after the removal of a short circuit
across the output terminals. Ch 1: Vout (1V/div). Ch 2: Iout
(20A/div).
Figure 18: SYNC OUT vs. time, driving SYNC IN of a second SynQor
MQFL converter. Ch1: SYNC OUT: (1V/div).
Product # MQFL-28V-3R3S
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:
Technniiccaall SSppeecciiffiiccaattiioonn
0.1
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.01
0.001
16Vin
28Vin
40Vin
16Vin
28Vin
40Vin
0.0001
10
100
1,000
Hz
10,000
100,000
10
100
1,000
Hz
10,000
100,000
Figure 20: Magnitude of incremental forward transmission
Figure 19: Magnitude of incremental output impedance
(FT = vout/vin) for minimum, nominal, and maximum input voltage at
full rated power.
(Zout = vout/iout) for minimum, nominal, and maximum input
voltage at full rated power.
100
10
0
10
-10
-20
1
-30
16Vin
0.1
28Vin
40Vin
16Vin
-40
-50
28Vin
40Vin
0.01
10
100
1,000
Hz
10,000
100,000
10
100
1,000
Hz
10,000
100,000
Figure 22: Magnitude of incremental input impedance (Zin = vin/iin)
for minimum, nominal, and maximum input voltage at full rated power.
Figure 21: Magnitude of incremental reverse transmission (RT =
iin/iout) for minimum, nominal, and maximum input voltage at full
rated power.
Figure 24: High frequency conducted emissions of MQFL-28-05S,
5Vout module at 120W output with MQFL-28-P filter, as measured
with Method CE102. Limit line shown is the ‘Basic Curve’for all
applications with a 28V source.
Figure 23: High frequency conducted emissions of standalone
MQFL-28-05S, 5Vout module at 120W output, as measured with Method
CE102. Limit line shown is the ‘Basic Curve’for all applications with a
28V source.
Product # MQFL-28V-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005109 Rev. A
04/14/09
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MQFL-28V-3R3S
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Technniiccaall SSppeecciiffiiccaattiioonn
The MQFL converter’s control circuit does not implement an output
over-voltage limit or an over-temperature shutdown.
BASIC OPERATION AND FEATURES
The MQFL DC/DC converter uses a two-stage power conversion
topology. The first, or regulation, stage is a buck-converter that
keeps the output voltage constant over variations in line, load,
and temperature. The second, or isolation, stage uses transformers
to provide the functions of input/output isolation and voltage
transformation to achieve the output voltage required.
The following sections describe the use and operation of additional
control features provided by the MQFL converter.
UNDER-VOLTAGE TRANSIENTS
The MQFL-28V series of DC/DC converters incorporate a special
“boost-converter” stage that permits the converters to deliver full
power through transients where its input voltage falls to as low as
5.5V. Normally, the boost-converter is non-operational, and the
converter’s input voltage is passed directly to its pre-regulation
stage (see the Block Diagram). When an under-voltage transient
occurs, the boost-converter becomes operational, and it steps-up
the input voltage to a value greater than 16V so that the nominal
output voltage can be sustained.
In the MQFL-28V series of converters the regulation stage is
preceeded by a boost-converter that permits these converters
to operate through various Military and Aircraft under-voltage
transients. Further discussion of this feature can be found later in
these notes.
Both the regulation and the isolation stages switch at a fixed
frequency for predictable EMI performance. The isolation stage
switches at one half the frequency of the regulation stage, but 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.
It is important to note that the boost-converter stage must first
become “armed” before it can become operational. This “arming”
occurs when the converter’s input voltage exceeds approximately
18V. The boost-converter then becomes operational whenever the
input voltage drops below the arming voltage, and it will remain
operational as long as the input voltage remains within the region
shown in the Under-Voltage Transient Profile. If the input voltage
drops below this transient profile, the boost-converter stage is not
guaranteed to continue operating (it may, but it will protect itself
from excessive stresses). Once the boost-converter stops operating,
the converter’s input voltage will be reconnected directly to the
input of the pre-regulator stage. The output voltage will therefore
collapse unless the input voltage is 16V, or greater.
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 MQFL converters have
such high efficiency, particularly at low output voltages.
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
MQFL converters employ a “back-drive current limit” to keep this
negative output terminal current small.
Note: the boost-converter will not become re-armed for the
next transient unless the input voltage once again exceeds
approximately 18V.
The transient profile shown in the Under-Voltage Transient Profile
is designed to comply (with appropriate margins) with all initial-
engagement surges, starting or cranking voltage transients, and
under-voltage surges specified in:
There is a control circuit on both the input and output sides of the
MQFL 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 opto-
isolators are used.
• MIL-STD-704-8 (A through F)
• RTCA/DO-160E
• MIL-STD-1275B
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 and
to avoid a hiccup mode, even under a tough start-up condition.
• DEF-STAN 61-5 (Part 6)/5 (operational portions)
Any input voltage transient that fits within the Under-Voltage
Transient Profile can be repeated after a delay that is at least four
times longer than the duration of the previous transient.
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 (i.e., there is not fold-
back or fold-forward characteristic to the output current under this
condition). When a load fault is removed, the output voltage rises
exponentially to its nominal value without an overshoot.
During the time when the boost-converter stage is operational, the
converter’s efficiency is reduced and the input ripple current is
increased. The lower the input voltage, the more these parameters
are affected.
Product # MQFL-28V-3R3S
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04/14/09
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MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
Usually the converter has an EMI filter upstream of it, and the
source voltage is connected to the input of this EMI filter. When,
during compliance testing, the source voltage goes low during
an under-voltage transient, the input to the converter will go even
lower. This is because the inductance of the EMI filter (as well
as the parasitic source inductance) will cause an oscillatory ring
with the bulk capacitor. With the bulk capacitor that is present in
an MQME-28 filter, the peak of this under-voltage ring may be
approximately 2 volts if the source voltage drops to 6V (it will be
smaller than this at a higher transient source voltage due to the
lower current drawn by the converter). As a result, it is necessary
to add extra bulk capacitor across the converter’s input pins if the
source voltage is going to drop to 6V, as it does for MIL-STD-704(A)
or MIL-STD 1275B. It is recommended that a 100µF/0.25Ω ESR
capacitor be connected across the input pins of the converter be
used as a starting point. For MIL-STD-704(B-F), where the source
voltage drops to only 7V, a 47µF hold-up capacitor would be a
good starting point. The exact amount of capacitance required
depends on the application (source inductance, load power, rate
of fall of the source voltage, etc). Please consult the factory if
further assistance is required.
when the converter is inhibited through the ENA1 pin, the bias
supply is also turned off, whereas this supply remains on when
the converter is inhibited through the ENA2 pin. A higher input
standby current therefore results in the latter case.
Both enable pins are internally pulled high so that an open
connection on both pins will enable the converter. Figure A shows
the equivalent circuit looking into either enable pins. It is TTL
compatible.
SHUT DOWN: The MQFL converter will shut down in response
5.6V
82K
1N4148
PIN 4
(or PIN 12)
ENABLE
TO ENABLE
CIRCUITRY
250K
125K
2N3904
Because input system stability is harder to maintain as the
input voltage gets lower, the MQFL-28V series converters are
designed to give external access to the voltage node between the
boost-converter and the pre-regulator stages. This access, at the
“STABILITY” pin (pin 3), permits the user to add a stabilizing bulk
capacitor with series resistance to this node. Since the voltage at
this node stays above 16V, the amount of capacitance required
is much less than would be required on the converter’s input pins
where the voltage might drop as low as 5.5V. It is recommended
that a 22µF capacitor with an ESR of about 1Ω be connected
between the STABILITY pin and the INPUT RETURN pin (pin
2). Without this special connection to the internal node of the
converter, a 300µF stabilizing bulk capacitor would have been
required across the converter’s input pins.
PIN 2
(or PIN 8)
IN RTN
Figure A: Equivalent circuit looking into either the ENA1 or ENA2
pins with respect to its corresponding return pin.
to only four conditions: ENA1 input low, ENA2 input low, VIN
input below under-voltage lockout threshold, or VIN input above
over-voltage shutdown threshold. Following a shutdown event,
there is a startup inhibit delay which will prevent the converter
from restarting for approximately 300ms. After the 300ms delay
elapses, if the enable inputs are 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.
Another advantage of the STABILITY pin is that it provides a
voltage source that stays above 16V when the under-voltage
transient occurs. This voltage source might be useful for other
circuitry in the system.
REMOTE SENSE: The purpose of the remote sense pins is to
correct for the voltage drop along the conductors that connect the
converter’s output to the load. To achieve this goal, a separate
conductor should be used to connect the +SENSE pin (pin 10)
directly to the positive terminal of the load, as shown in the
connection diagram. Similarly, the –SENSE pin (pin 9) should be
connected through a separate conductor to the return terminal of
the load.
CONTROL FEATURES
ENABLE: The MQFL converter has two enable pins. Both must
have a logic high level for the converter to be enabled. A logic
low on either pin will inhibit the converter.
The ENA1 pin (pin 4) is referenced with respect to the converter’s
input return (pin 2). The ENA2 pin (pin 12) is referenced with
respect to the converter’s output return (pin 8). This permits the
converter to be inhibited from either the input or the output side.
NOTE: Even if remote sensing of the load voltage is not desired, the
+SENSE and the -SENSE pins must be connected to +Vout (pin 7)
and OUTPUT RETURN (pin 8), respectively, to get proper regulation
of the converter’s output. If they are left open, the converter will
have an output voltage that is approximately 200mV higher than
its specified value. If only the +SENSE pin is left open, the output
voltage will be approximately 25mV too high.
Regardless of which pin is used to inhibit the converter, the
regulation and the isolation stages are turned off. However,
Product # MQFL-28V-3R3S
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:
Technniiccaall SSppeecciiffiiccaattiioonn
Inside the converter, +SENSE is connected to +Vout with a resistor
value from 100Ω to 301Ω, depending on output voltage, and
–SENSE is connected to OUTPUT RETURN with a 10Ω resistor.
5V
5K
It is also important to note that when remote sense is used,
the voltage across the converter’s output terminals (pins 7 and
8) will be higher than the converter’s nominal output voltage
due to resistive drops along the connecting wires. This higher
voltage at the terminals produces a greater voltage stress on the
converter’s internal components and may cause the converter to
fail to deliver the desired output voltage at the low end of the
input voltage range at the higher end of the load current and
temperature range. Please consult the factory for details.
TO SYNC
CIRCUITRY
PIN 6
PIN 2
SYNC IN
5K
IN RTN
Figure B: Equivalent circuit looking into the SYNC IN pin with
respect to the IN RTN (input return) pin.
SYNCHRONIZATION: The MQFL converter’s regulation and
isolation stage switching frequencies can be synchronized to an
external frequency source that is in the 500 kHz to 600 kHz range.
The boost-converter stage is free-running at about 670 kHz while
it is operational, and is not affected by synchronization signals. 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.
5V
5K
SYNC OUT
FROM SYNC
CIRCUITRY
PIN 5
IN RTN
PIN 2
OPEN COLLECTOR
OUTPUT
Figure C: Equivalent circuit looking into SYNC OUT pin with
respect to the IN RTN (input return) pin.
If the MQFL 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.
CURRENT SHARE: When several MQFL converters are placed
in parallel to achieve either a higher total load power or N+1
redundancy, their SHARE pins (pin 11) should be connected
together. The voltage on this common SHARE node represents the
average current delivered by all of the paralleled converters. Each
converter monitors this average value and adjusts itself so that its
output current closely matches that of the average.
If, due to a fault, the SYNC IN pin is held in either a logic low
or logic high state continuously, the MQFL converter will revert
to its free-running frequency.
The MQFL converter also has a SYNC OUT pin (pin 5). This
output can be used to drive the SYNC IN pins of as many as
ten (10) other MQFL converters. The pulse train coming out
of SYNC OUT 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.
Since the SHARE pin is monitored with respect to the OUTPUT
RETURN (pin 8) by each converter, it is important to connect all of
the converters’ OUTPUT RETURN pins together through a low DC
and AC impedance. When this is done correctly, the converters
will deliver their appropriate fraction of the total load current to
within +/- 10% at full rated load.
Whether or not converters are paralleled, the voltage at the
SHARE pin could be used to monitor the approximate average
current delivered by the converter(s). A nominal voltage of 1.0V
represents zero current and a nominal voltage of 2.2V represents
the maximum rated current, with a linear relationship in between.
The internal source resistance of a converter’s SHARE pin signal is
2.5 kΩ. During an input voltage fault or primary disable event, the
SHARE pin outputs a power failure warning pulse. The SHARE pin
will go to 3V for approximately 14ms as the output voltage falls.
The SYNC OUT signal is available only when the voltage at the
STABILITY pin (pin 3) is above approximately 12V and when
the converter is not inhibited through the ENA1 pin. An inhibit
through the ENA2 pin will not turn the SYNC OUT signal off.
NOTE: An MQFL converter that has its SYNC IN pin driven by
the SYNC OUT pin of a second MQFL converter will have its
start of its switching cycle delayed approximately 180 degrees
relative to that of the second converter.
NOTE: Converters operating from separate input filters with
reverse polarity protection (such as the MQME-28-T filter) with
their outputs connected in parallel may exhibit hiccup operation
at light loads. Consult factory for details.
Figure B shows the equivalent circuit looking into the SYNC
IN pin. Figure C shows the equivalent circuit looking into the
SYNC OUT pin.
Product # MQFL-28V-3R3S
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MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
OUTPUT VOLTAGE TRIM: If desired, it is possible to increase
the MQFL converter’s output voltage above its nominal value. To
do this, use the +SENSE pin (pin 10) for this trim function instead
of for its normal remote sense function, as shown in Figure D.
In this case, a resistor connects the +SENSE pin to the –SENSE
pin (which should still be connected to the output return, either
remotely or locally). The value of the trim resistor should be chosen
according to the following equation or from Figure E:
100,000
10,000
1,000
100
Vnom
Rtrim = 100 x
[
Vout – Vnom – 0.025
]
where:
Vnom = the converter’s nominal output voltage,
Vout = the desired output voltage (greater than Vnom), and
Rtrim is in Ohms.
0.00
0.06
0.12
0.18
0.24
0.30
0.36
Increase in Vout (V)
As the output voltage is trimmed up, it produces a greater voltage
stress on the converter’s internal components and may cause
the converter to fail to deliver the desired output voltage at the
low end of the input voltage range at the higher end of the load
current and temperature range. Please consult the factory for
details. Factory trimmed converters are available by request.
Figure E: Output Voltage Trim Graph
INPUT OVER-VOLTAGE SHUTDOWN: The MQFL 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 UNDER-VOLTAGE LOCKOUT: The MQFL converter has
an under-voltage lockout feature that ensures the converter will be
off if the input voltage is too low. This lockout only appears when
the boost-converter is not operating. 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 MQFL converter will not
respond to a state of the input voltage unless it has remained in
BACK-DRIVE CURRENT LIMIT: 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”.
Conditions where back-drive current might occur include paralleled
converters that do not employ current sharing, or where the current
share feature does not adequately ensure sharing during the
startup or shutdown transitions. It can also occur when converters
having different output voltages are connected together through
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.
1
12
+VIN
ENA 2
2
3
4
5
6
11
External bulk capacitor
RSTABILITY
IN RTN
SHARE
10
STABILITY
ENA 1
+SNS
+
28 Vdc
RTRIM
MQFL
9
-SNS
8
open
means
on
SYNC OUT
SYNC IN
OUT RTN
Load
7
+VOUT
CSTABILITY
+
Figure D: Typical connection for output voltage trimming.
Product # MQFL-28V-3R3S
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MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
either explicit or parasitic diodes that, while normally off, become
conductive during startup or shutdown. Finally, some loads, such
as motors, can return energy to their power rail. Even a load
capacitor is a source of back-drive energy for some period of time
during a shutdown transient.
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.
To avoid any problems that might arise due to back-drive current,
the MQFL converters limit the negative current that the converter
can draw from its output terminals. The threshold for this back-drive
current limit is placed sufficiently below zero so that the converter
may operate properly down to zero load, but its absolute value
(see the Electrical Characteristics) is small compared to the
converter’s rated output current.
THERMAL CONSIDERATIONS: The suggested Power Derating
Curves for this converter as a function of the case temperature and
the maximum desired power MOSFET junction temperature are on
the figure pages. All other components within the converter are
cooler than its hottest MOSFET, which at full power is no more
than 20ºC higher than the case temperature directly below this
MOSFET.
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.
The Mil-HDBK-1547A component derating guideline calls for a
maximum component temperature of 105ºC. The power derating
figure 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 the power derating figure. The maximum case
temperature at which the converter should be operated is 135ºC.
Product # MQFL-28V-3R3S
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MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
CONSTRUCTION AND ENVIRONMENTAL STRESS SCREENING OPTIONS
ES-Grade
(-55 ºC to +125 ºC)
(Element Evaluation)
HB-Grade
(-55 ºC to +125 ºC)
(Element Evaluation)
Consistent with
MIL-STD-883F
C-Grade
(-40 ºC to +100 ºC)
Screening
Internal Visual
Yes
No
Yes
Yes
*
Condition B
(-55 ºC to +125 ºC)
Condition C
(-65 ºC to +150 ºC)
Temperature Cycle
Method 1010
Constant
Acceleration
Method 2001
(Y1 Direction)
Condition A
(5000g)
No
500g
Method 1015
Load Cycled
Burn-in
• 10s period
24 Hrs @ +125 ºC
96 Hrs @ +125 ºC
160 Hrs @ +125 ºC
• 2s @ 100% Load
• 8s @ 0% Load
Method 5005
(Group A)
Final Electrical Test
+25 ºC
-45, +25, +100 ºC
Full QorSeal
-55, +25, +125 ºC
Full QorSeal
Mechanical Seal,
Thermal, and Coating
Process
Full QorSeal
External Visual
2009
Yes
Yes
*
Construction Process
QorSeal
QorSeal
QorSeal
* Per IPC-A-610 (Rev. D) Class 3
MilQor converters and filters are offered in four variations of construction technique and environmental stress screening options. The
three highest grades, C, ES, and HB, all 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 con-
structed of components that have been procured through an element evaluation process that pre-qualifies each new batch of devices.
Product # MQFL-28V-3R3S
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Page 15
MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
0.093
[2.36]
0.250 [6.35]
+VIN
ENA 2
1
12
IN RTN
SHARE
2
11
1.50 [38.10]
0.200 [5.08]
TYP. NON-CUM.
STABILITY
+SNS
-SNS
3
4
5
6
10 1.260
MQFL-28V-3R3S-X-HB
DC/DC CONVERTER
28Vin 3.3Vout @ 30A
[32.00]
ENA 1
9
8
7
MADE IN USA
OUT RTN
+VOUT
SYNC OUT
SYNC IN
0.040 [1.02]
PIN
S/N 0000000 D/C 3205-301 CAGE 1WX10
2.50 [63.50]
2.76 [70.10]
3.00 [76.20]
0.050 [1.27]
0.220 [5.59]
0.128 [3.25]
2.96 [75.2]
0.228 [5.79]
0.390 [9.91]
Case X
0.093
[2.36]
0.250 [6.35]
+VIN
ENA 2
1
12
11
0.200 [5.08]
TYP. NON-CUM.
IN RTN
STABILITY
SHARE
2
3
4
5
6
1.50 [38.10]
MQFL-28V-3R3S-U-HB
DC/DC CONVERTER
28Vin 3.3Vout @ 30A
+SNS
-SNS
10 1.260
[32.00]
ENA 1
9
8
7
OUT RTN
+VOUT
SYNC OUT
SYNC IN
MADE IN USA
0.040 [1.02]
PIN
S/N 0000000 D/C 3205-301 CAGE 1WX10
0.42
[10.7]
2.50 [63.50]
2.76 [70.10]
3.00 [76.20]
0.050 [1.27]
0.220 [5.59]
0.128 [3.25]
2.80 [71.1]
Case U
0.390 [9.91]
NOTES
PIN DESIGNATIONS
1)
2)
Pins 0.040” (1.02mm) diameter
Pin Function
Pin Function
Pins Material: Copper
Finish: Gold over Nickel plate
1
2
3
4
5
6
Positive input
Input return
Stability
7
8
9
Positive output
Output return
- Sense
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)
5)
6)
Weight: 2.8 oz (78.5 g) typical
Enable 1
10 + Sense
11 Share
Workmanship: Meets or exceeds IPC-A-610C Class III
Print Labeling on Top Surface per Product Label Format Drawing
Sync output
Sync input
12 Enable 2
Product # MQFL-28V-3R3S
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MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
0.300 [7.62]
0.140 [3.56]
1.15 [29.21]
0.250 [6.35]
TYP
0.250 [6.35]
1
2
3
4
5
6
+VIN
12
ENA 2
0.200 [5.08]
TYP. NON-CUM.
2.00
[50.80]
IN RTN
STABILITY
SHARE
+SNS
11
10
9
MQFL-28V-3R3S-Y-HB
DC/DC CONVERTER
28Vin 3.3Vout @ 30A
1.50
[38.10]
-SNS
ENA 1
OUT RTN
+VOUT
SYNC OUT
SYNC IN
MADE IN USA
8
1.750
[44.45]
S/N 0000000 D/C 3205-301 CAGE 1WX10
7
0.040 [1.02]
PIN
0.050 [1.27]
0.220 [5.59]
1.750 [44.45]
2.50 [63.50]
0.375 [9.52]
2.96 [75.2]
0.228 [5.79]
0.390 [9.91]
Case Y
Case Z
(variant of Y)
Case W
(variant of Y)
0.250 [6.35]
0.250 [6.35]
0.200 [5.08]
0.200 [5.08]
TYP. NON-CUM.
TYP. NON-CUM.
0.040 [1.02]
PIN
0.040 [1.02]
PIN
0.420 [10.7]
0.050 [1.27]
0.220 [5.59]
0.220 [5.59]
0.050 [1.27]
0.36 [9.2]
2.80 [71.1]
0.525 [13.33]
0.390
[9.91]
0.390
[9.91]
0.525 [13.33]
2.80 [71.1]
PIN DESIGNATIONS
Pin Function Pin Function
NOTES
1)
Pins 0.040” (1.02mm) diameter
2)
Pins Material: Copper
1
2
3
4
5
6
Positive input
Input return
Stability
Enable 1
Sync output
Sync input
7
8
9
Positive output
Output return
- Sense
Finish: Gold over Nickel plate
All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
Weight: 2.8 oz (78.5 g) typical
Workmanship: Meets or exceeds IPC-A-610C Class III
Print Labeling on Top Surface per Product Label Format Drawing
3)
4)
5)
6)
10 + Sense
11 Share
12 Enable 2
Product # MQFL-28V-3R3S
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MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
MilQor Converter FAMILY MATRIX
The tables below show the array of MQFL converters available. When ordering SynQor converters, please ensure that you use
the complete part number according to the table in the last page. Contact the factory for other requirements.
Single Output
Dual Output †
28V
1.5V
1.8V
2.5V
3.3V
5V
6V
7.5V
9V
12V
(12S)
15V
(15S)
±5V
(05D)
±12V
(12D)
±15V
(15D)
Full Size
(1R5S) (1R8S) (2R5S) (3R3S) (05S)
(06S) (7R5S) (09S)
(28S)
MQFL-28
16-40Vin Cont.
24A
Total
10A
Total
8A
Total
40A
40A
40A
40A
40A
40A
40A
40A
40A
40A
40A
40A
40A
40A
40A
30A
30A
30A
30A
30A
24A
24A
20A
20A
24A
20A
20A
17A
17A
20A
16A
16A
13A
13A
16A
13A
13A
11A
11A
13A
10A
10A
8A
8A
8A
4A
4A
16-50Vin 1s Trans.*
Absolute Max Vin = 60V
MQFL-28E
16-70Vin Cont.
16-80Vin 1s Trans.*
Absolute Max Vin =100V
24A
Total
10A
Total
8A
Total
MQFL-28V
16-40Vin Cont.
5.5-50Vin 1s Trans.*
Absolute Max Vin = 60V
20A
Total
8A
Total
6.5A
Total
6.5A
6.5A
8A
3.3A
3.3A
4A
MQFL-28VE
16-70Vin Cont.
5.5-80Vin 1s Trans.*
Absolute Max Vin = 100V
20A
Total
8A
Total
6.5A
Total
8A
MQFL-270
155-400Vin Cont.
155-475Vin 0.1s Trans.*
Absolute Max Vin = 550V
24A
Total
10A
Total
8A
Total
10A
Single Output
Dual Output †
28V
1.5V
1.8V
2.5V
3.3V
5V
6V
7.5V
9V
12V
(12S)
15V
(15S)
±5V
(05D)
±12V
(12D)
±15V
(15D)
Half Size
(1R5S) (1R8S) (2R5S) (3R3S) (05S)
(06S) (7R5S) (09S)
(28S)
MQHL-28 (50W)
16-40Vin Cont.
16-50Vin 1s Trans.*
Absolute Max Vin = 60V
10A
Total
4A
Total
3.3A
Total
20A
20A
20A
20A
20A
20A
15A
15A
10A
10A
8A
8A
6.6A
6.6A
5.5A
5.5A
4A
4A
3.3A
3.3A
1.8A
1.8A
MQHL-28E (50W)
16-70Vin Cont.
16-80Vin 1s Trans.*
Absolute Max Vin =100V
10A
Total
4A
Total
3.3A
Total
MQHR-28 (25W)
16-40Vin Cont.
16-50Vin 1s Trans.*
Absolute Max Vin = 60V
5A
Total
2A
Total
1.65A
Total
10A
10A
10A
10A
10A
10A
7.5A
7.5A
5A
5A
4A
4A
3.3A
3.3A
2.75A
2.75A
2A
2A
1.65A
1.65A
0.9A
0.9A
MQHR-28E (25W)
16-70Vin Cont.
16-80Vin 1s Trans.*
Absolute Max Vin =100V
5A
Total
2A
Total
1.65A
Total
Check with factory for availability.
Product # MQFL-28V-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005109 Rev. A
04/14/09
Page 18
MQFL-28V-3R3S
:
Technniiccaall SSppeecciiffiiccaattiioonn
PART NUMBERING SYSTEM
The part numbering system for SynQor’s MilQor DC-DC converters follows the format shown in the table below.
Output Voltage(s)
Input
Model
Name
Package Outline/
Pin Configuration
Screening
Grade
Voltage
Range
Single
Output
Dual
Output
1R5S
1R8S
2R5S
3R3S
05S
06S
7R5S
09S
28
28E
28V
28VE
U
X
Y
W
Z
C
ES
HB
MQFL
MQHL
MQHR
05D
12D
15D
270
12S
15S
28S
Example:
MQFL-28V-3R3S–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 patents, one or more of which might apply to this product:
5,999,417
6,927,987
6,222,742
7,050,309
6,545,890
7,072,190
6,577,109
7,085,146
6,594,159
7,119,524
6,731,520
7,269,034
6,894,468
7,272,021
6,896,526
7,272,023
Contact SynQor for further information:
Phone:
978-849-0600
Warranty
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 # MQFL-28V-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005109 Rev. A
04/14/09
Page 19
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