MQHL-28-3R3S-Y-ES [SYNQOR]
HIGH RELIABILITY DC-DC CONVERTER; 高可靠性DC-DC转换器
| 型号： | MQHL-28-3R3S-Y-ES |
| 厂家： | 
SYNQOR WORLDWIDE HEADQUARTERS |
| 描述： | HIGH RELIABILITY DC-DC CONVERTER |
| 文件： | 总17页 (文件大小：1098K) |
| 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
16-40 V
16-50 V
3.3 V
15.0 A
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.
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 n
isolators, and follow conservative component derating
guidelines. They are designed and actured to
comply with a wide range of military standa
Design Process
MQHL series converters are
• Designed for reliability per NA1-A guidelines
F
EATURING OR -REL SSEMBLY
EAL™ H
Q
S
I
A
• Designed with components derated p
— MIL-HDBK-1547
Features
— NAVSO P641A
ed switching frequency
• No opto-isolators
• Remote sense
Qualification ss
• Clock synchronization
• Primary referenced enable
• Continuous short circuit and overload protection
• Input under-voltage lockout/over-voltage shutdown
• Output under voltage and over voltage protection
MQHonverters aalified to:
• MIL-STD
— consisteCA/D0-160E
• SynQors First Are Qualifi
— consstent with MIL-STD-88
• SynQor’s Lg-Term Storage Surviy Quacation
• SynQor’s on-going lfe test
Specification Compliance
In-Line Manufacg Proess
MQHL series converters (with MQHE filter) are designed to meet:
• MIL-HDBK-704-8 (A through F)
• RTCA/DO-160E Section 16
• MIL-STD-1275B
• AS9100 and 001:2rtified facility
• Full cent treability
• Temperatcling
• DEF-STAN 61-5 (part 6)/5
• MIL-STD-461 (C, D, E)
• RTCA/DO-160E Section 22
• Constant accon
• 24, 96, 160 horn-in
• Three level temperature screening
Product # MQHL-28-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005077 Rev. 1
05/27/09
Page 1
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
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
12
+VIN
IN RTN
N/C
2
3
4
5
6
11
10
9
TRIM
CASE
+SNS
-SNS
+
+
28 Vdc
MQHL
ENA 1
Load
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. 1
05/27/09
Page 2
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
MQHL-28-3R3S ELECTRICAL CHARACTERISTICS
Parameter
Min. Typ. Max. Units Notes & Conditions
Group A
Vin=28 V dc ±5%, Iout=15.0 A, CL=0 µF, free running (see Note 9)
unless otherwise specified
Subgroup
(see Note 12)
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
60
50
-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
125
135
300
50
V
V
°C
°C
°C
V
Transient (≤100 µs)
Operating Case Temperature
Storage Case Temperature
Lead Temperature (20 s)
-65
Voltage at ENA1, ENA2
-1.2
INPUT CHARACTERISTICS
Operating Input Voltage Range
"
16
16
28
28
40
50
V
V
Continuous
Transient, 1 s
See Note 3
1, 2, 3
4, 5, 6
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
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
0.75
0.85
See Note 3
52.0
50.5
1.0
55.0
53.5
1.5
58.0
56.5
2.5
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 = 16 V; Iout = 15 A
No Load Input Current (operating)
Disabled Input Current (ENA)
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
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
10
40
Vin = 16 V, 28 V, 50 V
Bandwidth = 100 kHz – 10 MHz; see Figure 14
60
3.267
3.247
-20
-10
3.23
3.30
3.30
0
0
3.30
15
3.333
3.353
20
V
V
mV
mV
V
mV
A
W
A
A
mA
µF
Vout at sense leads
1
2, 3
"
" ; Vin = 16 V, 28 V, 40 V; Iout=15 A
" ; Vout @ (Iout=0 A) - Vout @ (Iout=15 A)
"
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
10
3.37
45
Bandwidth = 10 MHz; CL=11µF
0
0
16
15
50
18
4
10
21
See Note 4
30
5,000
See Note 6
-550
-350
350
mV
mV
Total Iout step = 7.5A‹-›15A, 1.5A‹-›7.5A; CL=11µF
4, 5, 6
4, 5, 6
550
"
Vin step = 16V‹-›50V; CL=11 µF; see Note 8
-100
-100
100
100
mV
mV
"
"
4, 5, 6
4, 5, 6
Output Voltage Rise Time
Output Voltage Overshoot
Turn-On Delay, Rising Vin
6
0
5.5
3.0
180
20
10
2
8.0
6.0
250
25
ms
%
ms
ms
ms
ms
Vout = 0.5V-›4.5V; Full Resistive Load
Resistive load
ENA = 5 V; see Notes 9 & 11
See Note 9
See Note 11
4, 5, 6
See Note 5
4, 5, 6
Turn-On Delay, Rising ENA
Restart Inhibit Time
4, 5, 6
4, 5, 6
Short Circuit Start Time
15.0
4, 5, 6
EFFICIENCY
Iout = 15 A (16 Vin)
TBD
TBD
TBD
TBD
TBD
TBD
87
88
86
86
84
83
11
11
%
%
%
%
%
%
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 = 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)
Load Fault Power Dissipation
Short Circuit Power Dissipation
TBD
TBD
Iout at current limit inception point, see Note 4
Vout ≤ 1.2 V
Product # MQHL-28-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005077 Rev. 1
05/27/09
Page 3
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
MQHL-28-3R3S ELECTRICAL CHARACTERISTICS (Continued)
Parameter
Min. Typ. Max. Units Notes & Conditions
Group A
Vin=28 V dc ±5%, Iout=15.0 A, CL=0 µF, free running (see Note 9)
unless otherwise specified
Subgroup
(see Note 12)
ISOLATION CHARACTERISTICS
Isolation Voltage
Input RTN to Output RTN
Any Input Pin to Case
Dielectric strength
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
22
500
550
600
kHz
1, 2, 3
Frequency Range
500
2.0
-0.5
20
700
5.5
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
20
40
mA
%
VSYNC OUT = 0.8 V
See Note 5
See Note 5
Duty Cycle
60
Output connected to SYNC IN of other MQFL unit
Enable Control (ENA)
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
4.8
Imax draw from pin allowed with module still on
See Figure A
3.2
4.0
RELIABILITY CHARACTERISTICS
Calculated MTBF (MIL-STD-217F2)
GB @ Tcase = 70ºC
3
2800
440
TBD
10 Hrs.
3
AIF @ Tcase = 70ºC
10 Hrs.
3
Demonstrated MTBF
10 Hrs.
WEIGHT CHARACTERISTICS
Device Weight
50
g
Electrical Characteristics Notes
1. Converter will undergo input over-voltage shutdown.
2. Derate output power to 50% of rated power at Tcase = 135º C.
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 ≥ 10 µs.
7. Line voltage transition time ≥ 100 µs.
8. Input voltage rise time ≤ 250 µs.
9. Operating the converter at a synchronization frequency above the free running frequency will slightly reduce the converter’s efficiency and 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 180 ms. See Shut Down section.
11. The module will attempt to start into an overload for 20ms before shutting down and waiting to Auto Retry.
12. 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 ESS
table for details.
13. These derating curves apply for the ES- and HB- grade products. The C- grade product has a maximum case temperature of 100º C and a maximum
junction temperature rise of 20º C above Tcase.
Product # MQHL-28-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005077 Rev. 1
05/27/09
Page 4
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
To be provided in future revisions.
To be provided in future revisions.
Figure 1: Efficiency at nominal output voltage vs. load
current for minimum, nominal, and maximum input voltage
at Tcase=25°C.
Figure 2: Efficiency at nominal output voltage and 60% rated
power vs. case temperature for input voltage of 16V, 28V,
and 40V.
To be provided in future revisions.
To be provided in future revisions.
Figure 4: Power dissipation at nominal output voltage and
60% rated power vs. case temperature for input voltage of
16V, 28V, and 40V.
Figure 3: Power dissipation at nominal output voltage vs.
load current for minimum, nominal, and maximum input
voltage at Tcase=25°C.
18
15
12
9
60
50
40
30
20
10
0
To be provided in future revisions.
6
Tjmax = 105º C
Tjmax = 125º C
Tjmax = 145º C
3
0
25
45
65
135 145
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 13).
Figure 6: Output voltage vs. load current showing typical
current limit curves.
Product # MQHL-28-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005077 Rev. 1
05/27/09
Page 5
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
Figure 7: Turn-on transient at full resistive load and zero
output capacitance initiated by ENA1. Input voltage
re-applied. Ch 1: Vout (1V/div). Ch 2: ENA1 (5V/div).
Figure 8: Turn-on transient at 10A resistive load and 5mF
output capacitance initiated by ENA1. Input voltage
pre-applied. Ch 1: Vout (1V/div). Ch 2: 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: Vout (1V/div). Ch 2: Vin (10V/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 250μS. 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. 1
05/27/09
Page 6
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
See Fig. 14
See Fig. 15
iC
MQHE
Filter
MQHL
Converter
VOUT
VSOURCE
10
µ
W
F,
ESR
1 µF
ceramic
100m
capacitor
capacitor
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.
Figure 15: Output voltage ripple, Vout, at nominal input voltage and
rated load current (20mV/div). Load capacitance: 1μF ceramic cap-
acitor and 10μF tantalum capacitor. Bandwidth: 10MHz. See
Figure 13.
Figure 16: Rise of output voltage after the removal of a short circuit
across the output terminals. Ch 1: Vout (1V/div).
Ch 2: Iout (10A/div).
Figure 17: SYNC OUT vs. time, driving SYNC IN of a second
SynQor MQHL converter. Ch1: SYNC OUT: (1V/div).
Product # MQHL-28-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005077 Rev. 1
05/27/09
Page 7
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
BASIC OPERATION AND FEATURES
CONTROL FEATURES
The MQHL DC/DC converter uses a two-stage power ENABLE: The MQFL 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
82.5K
result, both the input and the output of the converter have a
fundamental ripple frequency of about 550 kHz in the free-
running mode.
10K
ENA1
TO ENABLE
CIRCUITRY
Rectification of the isolation stage’s output is accomplished
PIN4
with synchronous rectifiers. These devices, which are
MOSFETs with a very low resistance, dissipate far less energy
IN RTN
than would Schottky diodes. This is the primary reason why
PIN2
the MQHL converters have such high efficiency, particularly
at low output voltages.
Figure A: Equivalent circuit looking into the ENA1 pin.
Besides improving efficiency, the synchronous rectifiers
permit operation down to zero load current. There is no
SHUT DOWN: The MQHL converter will shut down in
longer a need for a minimum load, as is typical for converters
response to only five conditions: ENA input low, VIN input
that use diodes for rectification. The synchronous rectifiers
below under-voltage lockout threshold, VIN input above
actually permit a negative load current to flow back into the
over-voltage shutdown threshold, output voltage below the
converter’s output terminals if the load is a source of short
output under-voltage threshold, and output voltage above
or long term energy. The MQHL converters employ a “back-
the output over-voltage threshold. Following any shutdown
drive current limit” to keep this negative output terminal
event, there is a startup inhibit delay which will prevent the
current small.
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.
There is a control circuit in the MQHL converter that
determines 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 lockout 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. 1
05/27/09
Page 8
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
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.
6000Ω *Vnom
Rtrim up(Ω) =
- 30000Ω
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.
Vout – Vnom
where:
Vnom = the converter’s nominal output voltage,
Vout = the desired output voltage (greater than
Vnom), and
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.
Rtrim up is in Ohms.
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.
The synchronization feature is entirely compatible with that
of SynQor’s MQFL family of converters.
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:
5V
5K
15000Ω *Vout—6000Ω *Vnom
Rtrim down(Ω ) =
- 30000Ω
Vnom—Vout
TO SYNC
CIRCUITRY
PIN 6
where:
SYNC IN
IN RTN
5K
Vnom = the converter’s nominal output voltage,
Vout = the desired output voltage (less than Vnom),
PIN 2
and
Rtrim down is in Ohms.
Figure B: Equivalent circuit looking into the SYNC IN pin with
respect to the IN RTN (input return) pin.
Factory trimmed converters are available by request.
Product # MQHL-28-3R3S
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Doc.# 005-0005077 Rev. 1
05/27/09
Page 9
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
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 D: 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 LOCKOUT: The MQHL
converter has an under-voltage lockout 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
11
10
9
+VIN
N/C
TRIM
+SNS
-SNS
RTRIM UP
2
IN RTN
28 Vdc
3
4
5
6
CASE
+
-
+
MQHL
ENA 1
Load
8
open
means
on
SYNC OUT
OUT RTN
7
SYNC IN
+VOUT
Figure E: Typical connection for output voltage trimming.
Product # MQHL-28-3R3S
Phone 1-888-567-9596
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Doc.# 005-0005077 Rev. 1
05/27/09
Page 10
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
THERMAL CONSIDERATIONS:
Figure 5 shows the When the converter is mounted on a metal plate, the plate
suggested Power Derating Curves for this converter as a will help to make the converter’s case bottom a uniform
function of the case temperature and the maximum desired temperature. How well it does so depends on the thickness
power MOSFET junction temperature. All other components of the plate and on the thermal conductance of the interface
within the converter are cooler than its hottest MOSFET, layer (e.g. thermal grease, thermal pad, etc.) between
which at full power is no more than 20ºC higher than the the case and the plate. Unless this is done very well, it
case temperature directly below this MOSFET.
is important not to mistake the plate’s temperature for the
maximumcasetemperature. Itiseasyforthemtobeasmuch
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.
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 INPUT SYSTEM INSTABILITY: This condition can occur
maximum case temperature at which the converter should because any dc-dc converter appears incrementally as a
be operated is 135ºC.
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.
Product # MQHL-28-3R3S
Phone 1-888-567-9596
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Doc.# 005-0005077 Rev. 1
05/27/09
Page 11
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
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 # MQHL-28-3R3S
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Doc.# 005-0005077 Rev. 1
05/27/09
Page 12
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
MQHL-28-3R3S-U-HB
DC-DC CONVERTER
28Vin 3.3Vout @ 15A
PACKAGE PINOUTS
Pin #
1
2
Function
POSITIVE INPUT
INPUT RETURN
CASE
3
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-
HB
Finish:
Gold over Nickel plate
DC-DC CONVERTER
3) All dimensions as inches (mm)
4) Tolerances: a) x.xx +0.02"
(x.x +0.5mm)
b) x.xxx +0.010"
(x.xx +0.25mm)
5) Weight: 1.6 oz.(45.4 g) typical
6) Workmanship: Meets or exceeds
IPC-A-610C Class III
Case W
Product # MQHL-28-3R3S
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05/27/09
Page 13
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
MQHL-28-3R3S-X-HB
DC-DC CONVERTER
28Vin 3.3Vout @ 15A
PACKAGE PINOUTS
Pin #
1
2
Function
POSITIVE INPUT
INPUT RETURN
CASE
3
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:
Gold over Nickel plate
MQHL-28-3R3S-Y-HB
DC-DC CONVERTER
28Vin 3.3Vout @ 15A
3) All dimensions as inches (mm)
4) Tolerances: a) x.xx +0.02”
(x.x +0.5mm)
b) x.xxx +0.010”
(x.xx +0.25mm)
5) Weight: 1.6 oz.(45.4 g) typical
6) Workmanship: Meets or exceeds
IPC-A-610C Class III
Case Y
Product # MQHL-28-3R3S
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Doc.# 005-0005077 Rev. 1
05/27/09
Page 14
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
PACKAGE PINOUTS
MQHL-28-3R3S-Z-HB
DC-DC CONVERTER
28Vin 3.3Vout @ 15A
Pin #
1
2
Function
POSITIVE INPUT
INPUT RETURN
CASE
3
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:
Gold over Nickel plate
3) All dimensions as inches (mm)
4) Tolerances: a) x.xx +0.02”
(x.x +0.5mm)
b) x.xxx +0.010”
(x.xx +0.25mm)
5) Weight: 1.6 oz.(45.4 g) typical
6) Workmanship: Meets or exceeds
IPC-A-610C Class III
Product # MQHL-28-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005077 Rev. 1
05/27/09
Page 15
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
MilQor MQHL FAMILY MATRIX
The tables below show the array of MQHL 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.
1.5V
(1R5S)
1.8V
(1R8S)
2.5V
(2R5S)
3.3V
(3R3S)
5V
(05S)
6V
(06S)
7.5V
(7R5S)
9V
(09S)
12V
(12S)
15V
(15S)
28V
(28S)
Single Output
MQHL-28
16-40Vin Cont.
16-50Vin 1s Trans.*
Absolute Max Vin = 60V
20A
20A
20A
20A
20A
20A
15A
15A
10A
10A
8.3A
8.3A
6.6A
6.6A
5.5A
5.5A
4.2A
4.2A
3.3A
3.3A
1.8A
1.8A
MQHL-28E
16-70Vin Cont.
16-80Vin 1s Trans.*
Absolute Max Vin =100V
5V
(05D)
12V
(12D)
15V
(15D)
Dual Output
MQHL-28
16-40Vin Cont.
10A
Total
8.3A
Total
6.6A
Total
16-50Vin 1s Trans.*
Absolute Max Vin = 60V
MQHL-28E
16-70Vin Cont.
10A
Total
8.3A
Total
6.6A
Total
16-80Vin 1s Trans.*
Absolute Max Vin =100V
*Converters may be operated continuously at the highest transient input voltage, but some component electrical and thermal stresses would be beyond
MIL-HDBK-1547A guidelines.
†80% of total output current available on any one output.
Product # MQHL-28-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005077 Rev. 1
05/27/09
Page 16
MQHL-28-3R3S
3.3 V
15 A
Output:
Current:
Technical Specification
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
Voltage
Range
Model
Name
Package Outline/
Pin Configuration
Screening
Grade
Single
Dual
Output
Output
1R5S
1R8S
2R5S
3R3S
05S
06S
7R5S
09S
U
X
Y
W
Z
05D
12D
15D
C
ES
HB
28
28E
MQHL
12S
15S
28S
APPLICATION NOTES
A variety of application notes and technical white papers can be downloaded in pdf format from the SynQor website.
Example: MQHL – 28 – 3R3S – Y – ES
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 # MQHL-28-3R3S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005077 Rev. 1
05/27/09
Page 17
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