MQHL-28-3R3S-Z-HB [SYNQOR]
1-OUTPUT 50W DC-DC REG PWR SUPPLY MODULE, MODULE-12;
| 型号： | MQHL-28-3R3S-Z-HB |
| 厂家： | 
SYNQOR WORLDWIDE HEADQUARTERS |
| 描述： | 1-OUTPUT 50W DC-DC REG PWR SUPPLY MODULE, MODULE-12 输出元件 |
| 文件： | 总18页 (文件大小：8241K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MQHL-28-3R3S
Single Output
HigH Reliability DC-DC ConveRteR
16-40V
16-50V
3.3V
15A
86% @ 7.5A / 86% @ 15A
Continuous Input
Transient Input
Output
Output
Efficiency
Full PoweR oPeRation: -55ºC to +125ºC
@
The MilQor series of high-reliability DC-DC converters
brings SynQor’s field proven high-efficiency synchronous
rectifier technology to the Military/Aerospace industry.
TM
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.
Design Process
D
f
esigneD & ManufactureD in the usa
MQHL series converters are:
•Designed for reliability per NAVSO-P3641-A guidelines
eaturing or sseMbly
Q
s
eal™
hi-rel
a
•Designed with components derated per:
— MIL-HDBK-1547A
Features
— NAVSO P-3641A
• Fixed switching frequency
• No opto-isolators
Qualification Process
• Output over-voltage shutdown
• Remote sense
• Clock synchronization
• Primary referenced enable
MQHL 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
• Continuous short circuit and overload protection
• Input under-voltage and over-voltage shutdown
Specification Compliance
In-Line Manufacturing Process
MQHL series converters (with MQHE filter) are designed to meet:
• MIL-HDBK-704-8 (A through F)
• RTCA/DO-160 Section 16, 17, 18
• MIL-STD-1275 (B, D) for VIN > 16V
• DEF-STAN 61-5 (part 6)/(5, 6) for VIN > 16V
• MIL-STD-461 (C, D, E, F)
•AS9100 and ISO 9001:2008 certified facility
•Full component traceability
•Temperature cycling
•Constant acceleration
•24, 96, 160 hour burn-in
• RTCA/DO-160(E, F, G) Section 22
•Three level temperature screening
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 1
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Technical Specification
BLOCK DIAGRAM
REGULATION STAGE
ISOLATION STAGE
7
CURRENT
SENSE
1
POSITIVE
POSITIVE
INPUT
OUTPUT
T1
T2
T1
T2
2
8
INPUT
RETURN
OUTPUT
RETURN
3
CASE
GATE DRIVERS
GATE CONTROL
12
UVLO
OVSD
CURRENT
LIMIT
NO CONNECT
11
4
TRIM
ENABLE 1
PRIMARY
CONTROL
CONTROL POWER
OVP
SECONDARY
CONTROL
10
5
MAGNETIC
FEEDBACK
+ SENSE
SYNC OUT
9
6
−
SENSE
SYNC IN
TYPICAL CONNECTION DIAGRAM
1
2
3
12
+VIN
N/C
11
10
9
IN RTN
CASE
TRIM
+SNS
-SNS
+
+
28 Vdc
_
MQHL
4
ENA 1
Load
_
5
6
8
open
means
on
SYNC OUT
SYNC IN
OUT RTN
+VOUT
7
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 2
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Technical Specification
MQHL-28-3R3S ELECTRICAL CHARACTERISTICS
Parameter
Min. Typ. Max. Units Notes & Conditions
Group A
Vin=28V dc ±5%, Iout=15A, CL=0µF, free running
(see Note 9) unless otherwise specified
Subgroup
(see Note 11)
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
60
60
-0.8
-1.2
V
V
V
V
Operating
See Note 1
Reverse Bias (Tcase = 125ºC)
Reverse Bias (Tcase = -55ºC)
Isolation Voltage (I/O to case, I to O)
Continuous
-500
-800
-55
500
800
125
135
300
50
V
V
°C
°C
°C
V
Transient (≤100µs)
Operating Case Temperature
Storage Case Temperature
Lead Temperature (20s)
HB Grade Products, See Notes 2 & 13
-65
Voltage at ENA1
-1.2
INPUT CHARACTERISTICS
Operating Input Voltage Range
“
16
16
28
28
40
50
V
V
Continuous
Transient, 1s
See Note 3
1, 2, 3
4, 5, 6
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
14.75 15.50 16.00
14.00 14.75 15.50
0.65
V
V
V
1, 2, 3
1, 2, 3
1, 2, 3
0.80
1.05
See Note 3
52.0
50.5
1.0
55.0
53.5
2.0
58.0
56.5
3.0
3.9
100
15
V
V
V
A
mA
mA
mA
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Vin = 16V; Iout = 15A
No Load Input Current (operating)
Disabled Input Current
75
10
40
Vin = 16V, 28V, 50V; ENA
Bandwidth = 100kHz – 10MHz; see Figure 14
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 Over-Voltage Shutdown
Output Voltage Ripple and Noise Peak to Peak
Operating Output Current Range
Operating Output Power Range
Output DC Current-Limit Inception
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
Output Voltage Deviation Line Transient
For a Pos. Step Change in Line Voltage
For a Neg. Step Change in Line Voltage
Turn-On Transient
75
3.27
3.25
-30
3.30
3.30
0
3.33
3.35
30
V
V
mV
mV
V
V
mV
A
W
A
A
Vout at sense leads
1
“
2, 3
“ ; Vin = 16V, 28V, 40V; Iout=15A
“ ; Vout @ (Iout=0A) - Vout @ (Iout=15A)
“
1, 2, 3
1, 2, 3
1, 2, 3
See Note 5
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
See Note 5
-15
0
15
3.23
3.7
3.30
4.3
15
3.37
4.7
75
Bandwidth = 10MHz; CL=11µF
0
0
16
15
50
18
4
10
21
See Note 4
50
5,000
mA
µF
See Note 6
-300
-100
100
mV
mV
Total Iout step = 7.5A to 15A, 1.5A to 7.5A; CL=11µF
4, 5, 6
4, 5, 6
300
“
Vin step = 16V to 50V; CL=11µF; see Note 7
-125
-125
125
125
mV
mV
4, 5, 6
4, 5, 6
Output Voltage Rise Time
Output Voltage Overshoot
Turn-On Delay, Rising Vin
Turn-On Delay, Rising ENA
Restart Inhibit Time
6
0
5.5
3.0
100
14
10
2
8.0
6.0
150
20
ms
%
ms
ms
ms
ms
Vout = 0.33V to 2.97V; Full Resistive Load
Resistive load
ENA = 5V; see Notes 8 & 10
See Note 10
See Note 10
4, 5, 6
See Note 5
4, 5, 6
4, 5, 6
4, 5, 6
4
Short Circuit Start Time
12
EFFICIENCY
Iout = 15 A (16 Vin)
83
85
82
83
80
81
79
87
88
86
86
84
84
83
2.5
%
%
%
%
%
%
%
W
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
Iout = 7.5 A (16 Vin)
Iout = 15 A (28 Vin)
Iout = 7.5 A (28 Vin)
Iout = 15 A (40 Vin)
Iout = 7.5 A (40 Vin)
Iout = 15 A (50 Vin)
Load Fault Power Dissipation
Sustained short circuit on output
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 3
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Technical Specification
MQHL-28-3R3S ELECTRICAL CHARACTERISTICS (Continued)
Parameter
Min. Typ. Max. Units Notes & Conditions
Group A
Vin=28V dc ±5%, Iout=15A, CL=0µF, free running
(see Note 9) unless otherwise specified
Subgroup
(see Note 11)
ISOLATION CHARACTERISTICS
Isolation Voltage
Dielectric strength
Input RTN to Output RTN
Any Input Pin to Case
500
500
500
100
100
V
V
V
MΩ
MΩ
nF
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
22
500
550
600
kHz
1, 2, 3
Frequency Range
Logic Level High
Logic Level Low
Duty Cycle
500
2.0
-0.5
20
700
5.5
0.8
80
kHz
V
V
1, 2, 3
1, 2, 3
1, 2, 3
%
See Note 5
Synchronization Output
Pull Down Current
Duty Cycle
20
40
mA
%
VSYNC OUT = 0.8V
Output connected to SYNC IN of other MQHL unit
See Note 5
See Note 5
60
Enable Control (ENA)
Off-State Voltage
Module Off Pulldown Current
On-State Voltage
0.8
V
µA
V
1, 2, 3
See Note 5
1, 2, 3
80
2
Current drain required to ensure module is off
Module On Pin Leakage Current
Pull-Up Voltage
Output Voltage Trim Range
RELIABILITY CHARACTERISTICS
Calculated MTBF (MIL-STD-217F2)
GB @ Tcase = 70ºC
20
4.8
10
µA
V
%
Imax draw from pin allowed with module still on
See Figure A
See Figure E
See Note 5
1, 2, 3
1, 2, 3
3.2
-10
4.0
4030
338
103 Hrs.
103 Hrs.
AIF @ Tcase = 70ºC
WEIGHT CHARACTERISTICS
Device Weight
45
g
Electrical Characteristics Notes
1. Converter will undergo input over-voltage shutdown.
2. Derate output power to 50% of rated power at Tcase = 135ºC. 135ºC is above the specified operating range. See 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. 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 ≥ 100µs.
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# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 4
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Technical Figures
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
Case Temperature (ºC)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for
Figure 2: Efficiency at nominal output voltage and 60% rated power vs.
minimum, nominal, and maximum input voltage at Tcase=25°C.
case temperature for input voltage of 16V, 28V, and 40V.
12
10
8
12
10
8
6
6
4
4
16 Vin
16 Vin
28 Vin
40 Vin
2
0
2
28 Vin
40 Vin
0
0
3
6
9
12
15
-55ºC
25ºC
125ºC
Case Temperature (ºC)
Load Current (A)
Figure 4: Power dissipation at nominal output voltage and 60% rated
Figure 3: Power dissipation at nominal output voltage vs. load current
power vs. case temperature for input voltage of 16V, 28V, and 40V.
for minimum, nominal, and maximum input voltage at Tcase=25°C.
3.6
3.0
2.4
1.8
1.2
0.6
0.0
18
15
12
9
60
50
40
30
20
10
0
6
Tjmax = 105º C
Tjmax = 125º C
Tjmax = 145º C
3
0
25
45
65
85
105
125
145
0
2
4
6
8
10
12
14
16
18
20
Load Current (A)
Case Temperature (ºC)
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 12).
Figure 6: Output voltage vs. load current showing typical current limit
curves at Vin = 28V (see Note 4).
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 5
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Technical Figures
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 3: ENA1 (5V/div).
Figure 8: Turn-on transient at full resistive load and 5mF output
capacitance initiated by ENA1. Input voltage pre-applied. Ch 1: Vout
(1V/div). Ch 3: ENA1 (5V/div).
Figure 10: 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 (5A/
div).
Figure 9: Turn-on transient at full resistive load and zero output
capacitance initiated by Vin. ENA1 previously high. Ch 1: Vin (10V/
div). Ch 3: Vout (1V/div).
Figure 11: 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 (5A/div).
Figure 12: Output voltage response to step-change in input voltage
(16V - 50V - 16V) in 150μS. Ch 1: Vout (100mV/div). Ch 2: Vin (20V/
div).
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 6
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Technical Figures
Figure 13: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 14) and Output Voltage Ripple (Figure
15).
Figure 14: 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 13.
capacitor and 10μF tantalum capacitor. Bandwidth: 10MHz. See Figure
13.
MQHL converter. Ch1: SYNC OUT: (1V/div).
‘
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 7
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Technical Figures
0.1
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.01
0.001
16V
28V
40V
16V
28V
40V
0.0001
1,000
10,000
Hz
100,000
10
100
1,000
Hz
10,000
100,000
Figure 19: Magnitude of incremental forward transmission (FT = vout/
vin) for minimum, nominal, and maximum input voltage at full rated
power.
Figure 18: Magnitude of incremental output impedance (Zout = vout/
iout) for minimum, nominal, and maximum input voltage at full rated
power.
Figure 20: Magnitude of incremental reverse transmission (RT = iin/
iout) for minimum, nominal, and maximum input voltage at full rated
power.
Figure 21: Magnitude of incremental input impedance (Zin = vin/iin)
for minimum, nominal, and maximum input voltage at full rated power.
Figure 22: High frequency conducted emissions of standalone MQHL-
28-05S, 5Vout module at 50W output, 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 MQHL-28-05S,
5Vout module at 50W output with MQHE-28-P filter, as measured
with Method CE102. Limit line shown is the ‘Basic Curve’for all
applications with a 28V source.
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 8
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Application Section
BASIC OPERATION AND FEATURES
CONTROL FEATURES
The MQHL DC/DC converter uses a two-stage power ENABLE: The MQHL converter has one enable pin, ENA1
conversion topology. The first, or regulation, stage is a (pin 4), which is referenced with respect to the converter’s
buck-converter that keeps the output voltage constant over input return (pin 2). It must have a logic high level for the
variations in line, load, and temperature. The second, or converter to be enabled; a logic low inhibits the converter.
isolation, stage uses transformers to provide the functions of
The enable pin is internally pulled high so that an open
input/output isolation and voltage transformation to achieve
connection will enable the converter. Figure A shows the
the output voltage required.
equivalent circuit looking into the enable pin. It is TTL
Both the regulation and the isolation stages switch at a fixed compatible and has hysteresis.
frequency for predictable EMI performance. The isolation
5V
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.
82.5K
10K
ENA1
TO ENABLE
CIRCUITRY
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 MQHL converters have such high efficiency, particularly at
low output voltages.
PIN4
PIN2
IN RTN
Figure A: Circuit diagram shown for reference only, actual circuit
components may differ from values shown for equivalent circuit.
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 MQHL converters employ a “back-
drive current limit” to keep this negative output terminal
current small.
SHUT DOWN: The MQHL converter will shut down in
response to only five conditions: ENA input low, VIN input
below under-voltage shutdown threshold, VIN input above
over-voltage shutdown threshold, output voltage below the
output under-voltage threshold, and output voltage above
the output over-voltage threshold. Following any shutdown
event, there is a startup inhibit delay which will prevent the
converter from restarting for approximately 100ms. After
the 100ms 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.
ThereisacontrolcircuitintheMQHLconverterthatdetermines
the conduction state of the power switches. It communicates
across the isolation barrier through a magnetically coupled
device. No opto-isolators are used.
An input under-voltage shutdown feature with hysteresis is
provided, as well as an input over-voltage shutdown and an
output over-voltage limit. There is also an output current
limit that is nearly constant as the load impedance decreases
(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. If a load fault pulls the
output voltage below about 60% of nominal, the converter
will shut down to attempt to clear the load fault. After a
short delay it will try to auto-restart.
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 on Page
2. Similarly, the –SENSE pin (pin 9) should be connected
through a separate conductor to the return terminal of the
load.
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.
The MQHL converter’s control circuit does not implement an
over-temperature shutdown.
The following sections describe the use and operation of
additional control features provided by the MQHL converter.
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 9
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Application Section
Inside the converter, +SENSE is connected to +Vout with a Figure B shows the equivalent circuit looking into the SYNC
100Ω resistor and –SENSE is connected to OUTPUT RETURN IN pin and Figure C shows the equivalent circuit looking into
with a 10Ω resistor.
the SYNC OUT pin.
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.
5V
5K
SYNC OUT
FROM SYNC
CIRCUITRY
PIN 5
PIN 2
IN RTN
OPEN COLLECTOR
OUTPUT
SYNCHRONIZATION: The MQHL 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
Figure C: Equivalent circuit looking into SYNC OUT pin with
respect to the IN RTN (input return) pin.
OUTPUT VOLTAGE TRIM: the TRIM pin (pin 11) can
adjust the MQHL converter’s output voltage ±10% around its
nominal value.
high. The transition time between the two states should be To trim the output voltage above its nominal value, connect
less than 300ns.
an external resistor from the TRIM pin to the –SENSE pin
as shown in Figure D. The value of this trim up resistor
should be chosen according to the following equation or
from Figure E:
If the MQHL 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.
Rtrim up(Ω) = 6100Ω*Vnom
- 30000Ω
Vout - Vnom
If, due to a fault, the SYNC IN pin is held in either a logic low
or logic high state continuously, or the SYNC IN frequency
is outside the 500-700 kHz range, the MQHL converter will
revert to its free-running frequency.
where:
Vnom = the converter’s nominal output voltage,
Vout = the desired output voltage (greater than
Vnom), and
Rtrim up is in Ohms.
The MQHL 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 MQHL 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 valid synchronization signal at the
SYNC IN pin, or the synchronization frequency if there is.
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.
To trim the output voltage below its nominal value, connect
an external resistor between the TRIM pin and the +SENSE
pin. The value of this trim down resistor should be chosen
according to the following equation or from Figure E:
The synchronization feature is entirely compatible with that
of SynQor’s MQFL family of converters.
5V
5K
Rtrim down(Ω) = 15400Ω*Vout - 6100Ω*Vnom
- 30000Ω
Vnom - Vout
TO SYNC
PIN 6
CIRCUITRY
SYNC IN
IN RTN
5K
PIN 2
where:
Vnom = the converter’s nominal output voltage,
Vout = the desired output voltage (less than Vnom),
and
Figure B: Equivalent circuit looking into the SYNC IN pin with
respect to the IN RTN (input return) pin.
Rtrim down is in Ohms.
Factory trimmed converters are available by request.
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 10
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Application Section
shutdown threshold does not change with output trim or
sense drops; excessive trim-up or output wiring drops may
cause an output over-voltage shutdown event. After a
startup inhibit delay, the converter will attempt to restart.
10000
Trim Up
Trim Down
OUTPUT UNDER-VOLTAGE SHUTDOWN: The MQHL
converter will also shut down if the voltage at its power
output pins ever dips below 60% of the nominal value for
more than a few milliseconds. Output voltage reduction
due to output current overload (current limit) is the most
common trigger for this shutdown. The shutdown threshold
does not change with output trim but at only 10%, trim-
down should not trigger this event. After a startup inhibit
delay, the converter will attempt to restart. This shutdown
is disabled during startup.
1000
100
10
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”.
-10% -8%
-6%
-4%
-2%
0%
2%
4%
6%
8%
10%
Output Voltage Adjustment
Figure E: Trim up and Trim down as a function of external trim resistance.
Conditions where back-drive current might occur include
paralleled converters that do not employ current sharing.
It can also occur when converters having different output
voltages are connected together through 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.
INPUT UNDER-VOLTAGE SHUTDOWN: The MQHL
converter has an under-voltage shutdown feature that
ensures the converter will be off if the input voltage is too
low. The input voltage turn-on threshold is higher than
the turn-off threshold. In addition, the MQHL 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.
To avoid any problems that might arise due to back-drive
current, the MQHL 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 page) is small compared to the converter’s
rated output current.
INPUT OVER-VOLTAGE SHUTDOWN: The MQHL
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.
OUTPUT OVER-VOLTAGE SHUTDOWN: The MQHL
converter will shut down if the voltage at its power output
pins ever exceeds about 130% of the nominal value. The
RTRIM DOWN
1
12
+VIN
N/C
RTRIM UP / RTRIM SENSE
2
11
IN RTN
TRIM
3
10
CASE
+SNS
+
+
28 Vdc
MQHL
MQHL
_
4
5
6
9
8
7
ENA 1
-SNS
OUT RTN
+VOUT
Load
_
open
means
on
SYNC OUT
SYNC IN
Figure D: Typical connection for output voltage trimming.
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 11
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Application Section
CURRENT LIMIT: In the event of excess load, the MQHL When the converter is mounted on a metal plate, the plate
converter will quickly reduce its output voltage to keep will help to make the converter’s case bottom a uniform
the load current within safe limits (see Figure 6). If the temperature. How well it does so depends on the thickness
overload persists for more than 14 milliseconds, the converter of the plate and on the thermal conductance of the interface
will shut off, wait a restart delay, and then automatically layer (e.g. thermal grease, thermal pad, etc.) between
attempt to re-start. The timeout is internally implemented the case and the plate. Unless this is done very well, it
with an integrator: counting up whenever current limit is is important not to mistake the plate’s temperature for the
active, and counting down at 1/5th the rate whenever current maximumcasetemperature. Itiseasyforthemtobeasmuch
limit becomes inactive. In this way a series of short-duration as 5-10ºC different at full power and at high temperatures.
overloads will not cause the converter to shut down, while it It is suggested that a thermocouple be attached directly to
will shut down in response to sustained overloads.
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.
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.Allothercomponentswithintheconverterarecooler
thanitshottestMOSFET, whichatfullpowerisnomorethan20ºC
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. 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. The maximum case temperature
at which the converter should be operated is 135ºC.
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 12
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Stress Screening
CONSTRUCTION AND ENVIRONMENTAL STRESS SCREENING OPTIONS
C-Grade
ES-Grade
HB-Grade
Consistent with
MIL-STD-883F
Screening
specified from
specified from
(
0spºeCcitfioe+d7f0roºmC ) (-45 ºC to +100 ºC) (-55 ºC to +125 ºC
)
Element Evaluation
No
Yes
No
No
Yes
Yes
Internal Visual
Temperature Cycle
Constant Acceleration
*
Yes
Yes
Condition B
(-55 ºC to +125 ºC)
Condition C
(-65 ºC to +150 ºC)
Method 1010
Method 2001
(Y1 Direction)
Condition A
(5000g)
500g
Burn-in
Method 1015
24 Hrs @ +125 ºC
96 Hrs @ +125 ºC
160 Hrs @ +125 ºC
Final Electrical Test
Method 5005 (Group A)
+25 ºC
Full QorSeal
*
-45, +25, +100 ºC
Full QorSeal
Yes
-55, +25, +125 ºC
Full QorSeal
Yes
Mechanical Seal,
Thermal, and
Coating Process
External Visual
2009
Construction Process
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# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 13
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Mechanical Diagrams
MQHL-28-3R3S-U-ES
DC-DC ConvERtER
28viꢀ 3.3vꢁuꢂ @ 15A
PIN DESIGNATIONS
Pin # Function
1
2
3
Positive input
Input return
Case
4
Enable 1
5
6
7
8
Sync output
Sync input
Positive output
Output return
- Sense
Case U
9
10
11
12
+ Sense
Trim
No connection
NOTES
1)
Case: Aluminum with gold over
nickel plate finish for the C,
ES, and HB Grade products.
2)
Pins: Diameter: 0.040’’ (1.02mm)
Material: Copper
MQHL-28-3R3S-W-ES
DC-DC ConvERtER
28viꢀ 3.3vꢁuꢂ @ 15A
Finish: Copper alloy with Gold
over Nickel plating, followed
by Sn/Pb solder dip
3)
4)
All dimensions in inches (mm)
Tolerances: a) x.xx +/-0.02 in.
(x.x +/-0.5mm)
b) x.xxx +/-0.010 in.
(x.xx +/-0.25mm)
5)
6)
Weight: 1.6 oz (45.4 g) typical
Workmanship: Meets or exceeds
IPC-A-610 Class III
7)
8)
Pin 1 identification hole, not intended
for mounting
Baseplate flatness tolerance is 0.004”
(.10mm) TIR for surface
Case W
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 14
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Mechanical Diagrams
MQHL-28-3R3S-X-ES
DC-DC ConvERtER
28viꢀ 3.3vꢁuꢂ @ 15A
PIN DESIGNATIONS
Pin # Function
1
2
3
Positive input
Input return
Case
4
Enable 1
5
6
7
8
Sync output
Sync input
Positive output
Output return
- Sense
Case X
9
10
11
12
+ Sense
Trim
No connection
NOTES
1)
Case: Aluminum with gold over
nickel plate finish for the C,
ES, and HB Grade products.
2)
Pins: Diameter: 0.040’’ (1.02mm)
Material: Copper
Finish: Copper alloy with Gold
over Nickel plating, followed
MQHL-28-3R3S-Y-ES
DC-DC ConvERtER
28viꢀ 3.3vꢁuꢂ @ 15A
by Sn/Pb solder dip
3)
4)
All dimensions in inches (mm)
Tolerances: a) x.xx +/-0.02 in.
(x.x +/-0.5mm)
b) x.xxx +/-0.010 in.
(x.xx +/-0.25mm)
5)
6)
Weight: 1.6 oz (45.4 g) typical
Workmanship: Meets or exceeds
IPC-A-610 Class III
7)
8)
Pin 1 identification hole, not intended
for mounting
Baseplate flatness tolerance is 0.004”
(.10mm) TIR for surface
Case Y
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 15
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Mechanical Diagrams
PIN DESIGNATIONS
MQHL-28-3R3S-Z-ES
DC-DC ConvERtER
28viꢀ 3.3vꢁuꢂ @ 15A
Pin # Function
1
2
3
Positive input
Input return
Case
4
Enable 1
5
6
7
8
Sync output
Sync input
Positive output
Output return
- Sense
Case Z
9
10
11
12
+ Sense
Trim
No connection
NOTES
1)
Case: Aluminum with gold over
nickel plate finish for the C,
ES, and HB Grade products.
2)
Pins: Diameter: 0.040’’ (1.02mm)
Material: Copper
Finish: Copper alloy with Gold
over Nickel plating, followed
by Sn/Pb solder dip
3)
4)
All dimensions in inches (mm)
Tolerances: a) x.xx +/-0.02 in.
(x.x +/-0.5mm)
b) x.xxx +/-0.010 in.
(x.xx +/-0.25mm)
5)
6)
Weight: 1.6 oz (45.4 g) typical
Workmanship: Meets or exceeds
IPC-A-610 Class III
7)
8)
Pin 1 identification hole, not intended
for mounting
Baseplate flatness tolerance is 0.004”
(.10mm) TIR for surface
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 16
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Ordering Information
MilQor Converter FAMILY MATRIX
The tables below show the array of MilQor 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 †
1.5V
1.8V
2.5V
3.3V
5V
6V
7.5V
9V
12V
15V
28V
5V
12V
15V
Full Size
MQFL-28
(1R5S) (1R8S) (2R5S) (3R3S)
(05S)
(06S)
(7R5S)
(09S)
(12S)
(15S)
(28S)
(05D)
(12D)
(15D)
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.
24A
Total
10A
Total
8A
Total
16-80Vin 1s Trans.*
Absolute Max Vin =100V
MQFL-28V
16-40Vin Cont.
6.5A
6.5A
8A
3.3A
3.3A
4A
5.5-50Vin 1s Trans.*
Absolute Max Vin = 60V
MQFL-28VE
16-70Vin Cont.
8A
5.5-80Vin 1s Trans.*
Absolute Max Vin = 100V
MQFL-270
155-400Vin Cont.
24A
Total
10A
Total
8A
Total
10A
155-475Vin 1s Trans.*
Absolute Max Vin = 550V
MQFL-270L
15A
Total
6A
Total
5A
Total
65-350Vin Cont.
40A
40A
30A
22A
15A
12A
10A
8A
6A
5A
2.7A
65-475Vin 1s Trans.*
Absolute Max Vin = 550V
Single Output
Dual Output †
1.5V
1.8V
2.5V
3.3V
5V
6V
7.5V
9V
12V
15V
28V
5V
12V
15V
Half Size
(1R5S) (1R8S) (2R5S) (3R3S)
(05S)
(06S)
(7R5S)
(09S)
(12S)
(15S)
(28S)
(05D)
(12D)
(15D)
MQHL-28
16-40Vin Cont.
10A
Total
4A
Total
3.3A
Total
20A
20A
10A
20A
20A
10A
20A
20A
10A
15A
15A
7.5A
10A
10A
5A
8A
8A
4A
6.6A
6.6A
3.3A
5.5A
5.5A
4A
4A
2A
3.3A
3.3A
1.8A
1.8A
0.9A
16-50Vin 1s Trans.*
Absolute Max Vin = 60V
MQHL-28E
16-70Vin Cont.
10A
Total
4A
Total
3.3A
Total
16-80Vin 1s Trans.*
Absolute Max Vin =100V
MQHR-28
16-40Vin Cont.
5A
Total
2A
Total
1.65A
Total
2.75A
1.65A
16-50Vin 1s Trans.*
Absolute Max Vin = 60V
MQHR-28E
16-70Vin Cont.
5A
Total
2A
Total
1.65A
Total
10A
10A
10A
7.5A
5A
4A
3.3A
2.75A
2A
1.65A
0.9A
16-80Vin 1s Trans.*
Absolute Max Vin = 100V
Check with factory for availability.
†80% of total output current available on any one output.
*Converters may be operated at the highest transient input voltage, but some component electrical and thermal stresses would be beyond MIL-
HDBK-1547A guidelines.
Product# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 17
MQHL-28-3R3S
Output: 3.3V
Current: 15A
Ordering Information
PART NUMBERING SYSTEM
The part numbering system for SynQor’s MilQor DC-DC converters follows the format shown in the table below.
Not all combinations make valid part numbers, please contact SynQor for availability. See the Product Summary web page for more options.
Example: MQHL-28-3R3S-Y-ES
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
MQFL
MQHL
MQHR
05D
12D
15D
C
ES
HB
270
270L
12S
15S
28S
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
6,894,468
7,119,524
7,765,687
6,222,742
6,896,526
7,269,034
7,787,261
6,545,890
6,927,987
7,272,021
8,023,290
6,577,109
7,050,309
7,272,023
8,149,597
6,594,159
7,072,190
7,558,083
6,731,520
7,085,146
7,564,702
Contact SynQor for further information and to order:
Warranty
SynQor offers a two (2) year limited warranty. Complete warranty informa-
tion is listed on our website or is available upon request from SynQor.
Phone:
Toll Free: 1-888-567-9596
978-849-0600
Fax:
E-mail:
Web:
978-849-0602
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# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 18
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