MQFL-28-05S
Single Output
H
IGH
R
ELIABILITY
DC/DC C
ONVERTER
Continuous Input Transient Input
16-40V
16-50V
Output
5.0V
Output
24A
89% @ 12A / 88% @ 24A
Efficiency
F
U L L
P
O W E R
O
P E R AT I O N
: - 5 5 º C
T he Mi l Qo r
®
s e r i e s o f h i g h - r e l i a b i l i t y D C / D C c o n v e r t e r s b r i n g s
Sy n Q or’ s f ie l d pr ove n h ig h- e ff ic i e nc y sy nc h ro nou s r e ct if i er t e c h -
n ology to th e Mi lit ar y/Aeros pace i n du str y. SynQ or’ s i n nova -
tive QorSeal p ac k a gi ng a p p ro a c h e n su re s su r v iv a b il it y i n t he
m ost h ost ile envi ron men ts . Co mpati ble wit h t he i ndus try st an -
dard f ormat, t hese con ver ters o perat e at a f ix ed f requency,
h ave n o opto- iso lat ors, and follow con servati ve com po nen t
d e ra t in g gui d e li ne s . T he y a re de s ign e d an d ma nu fa ctu re d t o
com ply wit h a wide rang e of mili tary stan dar ds .
Design Pr ocess
MQFL series converters are:
• Designed for reliability per NAVSO-P3641-A guidelines
• Designed with components derated per:
— MIL-HDBK-1547A
— NAVSO P-3641A
•
•
•
•
•
•
•
•
TM
TO
+125ºC
D
ESIGNED
& M
ANUFACTURED IN THE
USA
F
EATURING
Q
OR
S
EAL
™
H
I
-R
EL
A
SSEMBLY
Features
Fixed switching frequency
No opto-isolators
Parallel operation with current share
Remote sense
Clock synchronization
Primary and secondary referenced enable
Continuous short circuit and overload protection
Input under-voltage lockout/over-voltage shutdown
Qualification Pr ocess
MQFL 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
Specification Compliance
In-Line Manufacturing Pr ocess
•
•
•
•
•
•
AS9100 and ISO 9001:2000 certified facility
Full component traceability
Temperature cycling
Constant acceleration
24, 96, 160 hour burn-in
Three level temperature screening
Phone 1-888-567-9596
www.synqor.com
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
• DEF-STAN 61-5 (part 6)/5
• MIL-STD-461 (C, D, E)
• RTCA/DO-160E Section 22
Doc.# 005-2MQ050S Rev. C
1/21/08
Page 1
Product # MQFL-28-05S
MQFL-28-05S
Output:
5.0 V
Current:
24 A
Technical Specificat
ion
BLOCK DIAGRAM
REGULATION STAGE
ISOLATION STAGE
CURRENT
SENSE
T1
T2
T1
T2
1
POSITIVE
INPUT
7
POSITIVE
OUTPUT
2
INPUT
RETURN
ISOLATION BARRIER
8
OUTPUT
RETURN
3
CASE
GATE DRIVERS
UVLO
OVSD
GATE DRIVERS
12
ENABLE 2
4
ENABLE 1
PRIMARY
CONTROL
CURRENT
LIMIT
MAGNETIC
11
SECONDARY
CONTROL
SHARE
5
SYNC OUTPUT
DATA COUPLING
10
+ SENSE
6
SYNC INPUT
BIAS POWER
9
-
SENSE
CONTROL
POWER
TRANSFORMER
TYPICAL CONNECTION DIAGRAM
1
2
3
28Vdc +
–
open
means
on
+VIN
IN RTN
CASE
ENA 1
SYNC OUT
SYNC IN
ENA 2
SHARE
12
11
10
9
8
7
open
means
on
4
5
6
MQFL
+ SNS
– SNS
OUT RTN
+VOUT
+
Load
–
Product # MQFL-28-05S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2MQ050S Rev. C
1/21/08
Page 2
MQFL-28-05S
Output:
5.0 V
Current:
24 A
Technical Specificat
ion
MQFL-28-05S ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
1
Reverse Bias (T
CASE
= 125ºC)
Reverse Bias (T
CASE
= -55ºC)
Isolation Voltage (input/output to case, input to output)
Continuous
Transient (£100 µs)
Operating Case Temperature
2
Storage Case Temperature
Lead Temperature (20 sec)
Voltage at ENA1, ENA2, SYNC IN
60
60
-0.8
-1.2
-500
-800
-55
-65
-1.2
16
16
14.75
13.80
0.50
54.0
50.0
2.0
28
28
15.50
14.40
1.10
56.8
51.4
5.3
110
2
25
40
4.95
4.92
-20
15
4.90
0
0
26
26
5.00
5.00
0
25
5.00
15
500
800
135
135
300
50
40
50
16.00
15.00
1.80
60.0
54.0
8.0
9.5
160
5
50
60
5.05
5.08
20
35
5.10
30
24
120
33
34
50
10,000
V
V
V
V
V
V
°C
°C
°C
V
V
V
V
V
V
V
V
V
A
mA
mA
mA
mA
V
V
mV
mV
V
mV
A
W
A
A
A
mA
µF
1, 2, 3
4, 5, 6
1, 2, 3
1, 2, 3
1, 2, 3
1,
1,
1,
1,
1,
1,
1,
1,
2,
2,
2,
2,
2,
2,
2,
2,
3
3
3
3
3
3
3
3
Min.
Nom.
Max.
Units Notes & Conditions
Vin=28V DC
±
5%, Iout = 24A, C
L
= 0 µF,
free running
10
unless otherwise specified
Group A
Subgroup
13
INPUT CHARACTERISTICS
Operating Input Voltage Range (continuous)
Operating Input Voltage Range (transient, 1 sec)
Input Under-Voltage Lockout
3
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Input Over-Voltage Shutdown
3
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Shutdown Voltage Hysteresis
Maximum Input Current
No Load Input Current (operating)
Disabled Input Current (ENA1)
Disabled Input Current (ENA2)
Input Terminal Current Ripple (peak to peak)
Vin = 16V; Iout = 24A
Vin = 16V, 28V, 50V
Vin = 16V, 28V, 50V
Bandwidth = 100 kHz – 10 MHz; see Figure 14
Vout at sense leads
“
“
; Vin = 16V, 28V, 50V
“
; Vout @ (Iout=0A) - Vout @ (Iout=24A)
“
Bandwidth = 10 MHz; C
L
=11µF
OUTPUT CHARACTERISTICS
Output Voltage Set Point (T
CASE
= 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
4
Short Circuit Output Current
Back-Drive Current Limit while Enabled
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
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
1, 2, 3
See Note 5
29
30
7.5
10
Vout
£
1.2V
DYNAMIC CHARACTERISTICS
Output Voltage Deviation Load Transient
6
For a Positive Step Change in Load Current
For a Negative Step Change in Load Current
Settling Time (either case)
7
Output Voltage Deviation Line Transient
8
For a Positive Step Change in Line Voltage
For a Negative Step Change in Line Voltage
Settling Time (either case)
7
Turn-On Transient
Output Voltage Rise Time
Output Voltage Overshoot
Turn-On Delay, Rising Vin
9 11
Turn-On Delay, Rising ENA1
11
Turn-On Delay, Rising ENA2
11
-450
-350
350
100
450
200
500
500
500
10
2
8.0
6.0
3.0
mV
mV
µs
mV
mV
µs
ms
%
ms
ms
ms
%
%
%
%
%
%
W
W
Total Iout step = 12A
«
24A, 2.4A
«
12A; C
L
=11µF
“
Vin step = 16V
«
50V; C
L
=11µF
“
Vout = 0.5V
®
4.5V
ENA1, ENA2 = 5V
ENA2 = 5V
ENA1 = 5V
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
See Note 5
4, 5, 6
See Note 5
4, 5, 6
4, 5, 6
4, 5, 6
1,
1,
1,
1,
1,
1,
1,
1,
2,
2,
2,
2,
2,
2,
2,
2,
3
3
3
3
3
3
3
3
-500
-500
250
6
0
5.5
3.0
1.5
84
87
84
86
83
85
88
90
88
89
87
88
22
24
EFFICIENCY
Iout = 24A (16Vin)
Iout = 12A (16Vin)
Iout = 24A (28Vin)
Iout = 12A (28Vin)
Iout = 24A (40Vin)
Iout = 12A (40Vin)
Load Fault Power Dissipation
Short Circuit Power Dissipation
33
34
Iout at current limit inception point
Vout
£
1.2V
4
Product # MQFL-28-05S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2MQ050S Rev. C
1/21/08
Page 3
MQFL-28-05S
Output:
5.0 V
Current:
24 A
Technical Specificat
ion
MQFL-28-05S ELECTRICAL CHARACTERISTICS (Continued)
Parameter
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Input RTN to Output RTN
Any Input Pin to Case
Any Output Pin to Case
Isolation Resistance (input rtn to output rtn)
Isolation Resistance (any pin to case)
Isolation Capacitance (input rtn to output rtn)
500
500
500
100
100
44
500
500
2
-0.5
20
20
25
550
600
700
10
0.8
80
V
V
V
MW
MW
nF
kHz
kHz
V
V
%
mA
%
V
µA
V
µA
V
VSYNC OUT = 0.8V
Output connected to SYNC IN of another MQFL converter
1
1
1
1
1
1
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
See Note 5
See Note 5
See Note 5
1, 2, 3
See Note 5
1, 2, 3
See Note 5
1, 2, 3
Min.
Nom.
Max.
Units Notes & Conditions
Vin=28V DC
±
5%, Iout = 24A, C
L
= 0 µF,
free running
10
unless otherwise specified
Group A
Subgroup
13
FEATURE CHARACTERISTICS
Switching Frequency (free running)
Synchronization Input
Frequency Range
Logic Level High
Logic Level Low
Duty Cycle
Synchronization Output
Pull Down Current
Duty Cycle
Enable Control (ENA1 and ENA2)
Off-State Voltage
Module Off Pulldown Current
On-State Voltage
Module On Pin Leakage Current
Pull-Up Voltage
75
0.8
80
2
3.2
4.0
20
4.5
Current drain required to ensure module is off
Maximum current draw from pin allowed with module still on
See Figure A
RELIABILITY CHARACTERISTICS
Calculated MTBF (MIL-STD-217F2)
GB @ T
case
=70ºC
AIF @ T
case
=70ºC
Demonstrated MTBF
2800
440
TBD
79
10
3
Hrs.
10
3
Hrs.
10
3
Hrs.
g
WEIGHT CHARACTERISTICS
Device Weight
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
³
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
³
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. After a disable or fault event, module is inhibited from restarting for 300ms. See Shut Down section on Page 9.
12. SHARE pin outputs a power failure warning pulse during a fault condition. See Current Share section on Page 11.
13. Only the ES and HB grade products are tested at three temperatures. The B and C grade products are tested at one temperature. Please refer to the
ESS table on Page 13 for details.
14. 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 T
CASE
. The B- grade product has a maximum case temperature of 85º C and a maximum junction tempera-
ture rise of 20º C at full load.
Product # MQFL-28-05S
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2MQ050S Rev. C
1/21/08
Page 4
MQFL-28-05S
Output:
5.0 V
Current:
24 A
Technical Specificat
ion
100
95
90
100
95
90
Efficiency (%)
Efficiency (%)
85
80
75
70
65
60
0
4
8
12
16
20
24
16 Vin
28 Vin
40 Vin
85
80
75
70
65
60
-55ºC
25ºC
125ºC
16 Vin
28 Vin
40 Vin
Load Current (A)
Case Temperature (ºC)
Figure 1:
Efficiency at nominal output voltage vs. load current for min-
imum, nominal, and maximum input voltage at T
CASE
=25
°
C.
Figure 2:
Efficiency at nominal output voltage and 60% rated power vs.
case temperature for input voltage of 16V, 28V, and 40V.
20
18
16
20
18
16
Power Dissipation (W)
14
12
10
8
6
4
2
0
0
4
8
12
16
20
24
16 Vin
28 Vin
40 Vin
Power Dissipation (W)
14
12
10
8
6
4
2
0
-55ºC
25ºC
125ºC
16 Vin
28 Vin
40 Vin
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 T
CASE
=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.
32
28
24
20
160
140
6
5
120
Output Voltage (V)
16
12
8
4
0
25
45
65
85
105
125
80
60
Pout (W)
100
4
Iout (A)
3
2
T
j
max
T
j
max
= 125ºC
T
j
max
= 145ºC
= 105ºC
40
20
0
1
28 V
0
0
5
10
15
20
25
30
35
135
145
Case Temperature (ºC)
Load Current (A)
Figure 5:
Output Current / Output Power derating curve as a function
of T
CASE
and the Maximum desired power MOSFET junction tempera-
ture at Vin = 28V (see Note 14).
Product # MQFL-28-05S
Phone 1-888-567-9596
Figure 6:
Output voltage vs. load current showing typical current limit
curves.
www.synqor.com
Doc.# 005-2MQ050S Rev. C
1/21/08
Page 5
