Vin=28V dc ±5%, Iout=40A, CL=0µF, free running (see Note 10)
unless otherwise specified
Technical Specification
Group A
Subgroup
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
75
0.8
80
2
3.2
4.0
20
4.5
Current drain required to ensure module is off
Imax drawn from pin allowed, module on
See Figure A
2800
440
79
10
3
Hrs.
10
3
Hrs.
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 specified operating range.
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 ±50mV 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. After a disable or fault event, module is inhibited from restarting for 300ms. See Shut Down section of the Control Features description.
12. SHARE pin outputs a power failure warning pulse during a fault condition. See Current Share 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 70ºC and a maximum junction
temperature rise of 20ºC above T
CASE
.
15. 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# MQFL-28-1R5S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-2MQ1R5S Rev. C
10/24/13
Page 4
MQFL-28-1R5S
Output:
1.5V
Current:
40A
Technical Figures
100
95
90
100
95
90
Efficiency (%)
Efficiency (%)
16 Vin
28 Vin
40 Vin
0
5
10
15
20
25
30
35
40
85
80
75
70
65
60
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
minimum, nominal, and maximum input voltage at Tcase=25°C.
20
18
16
Figure 2: Efficiency at nominal output voltage and 60% rated power vs.
case temperature for input voltage of 16V, 28V, and 40V.
16
14
Power Dissipation (W)
14
12
10
8
6
4
2
0
0
5
10
15
20
25
30
35
40
16 Vin
28 Vin
40 Vin
Power Dissipation (W)
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 Tcase=25°C.
50
45
40
35
75
68
60
Figure 4: Power dissipation at nominal output voltage and 60% rated
power vs. case temperature for input voltage of 16V, 28V, and 40V.
1.8
1.6
1.4
Pout (W)
Iout (A)
30
25
20
15
10
5
0
25
45
65
85
105
125
= 105ºC
= 125ºC
= 145ºC
45
38
30
23
15
8
0
145
Output Voltage (V)
53
1.2
1
0.8
0.6
0.4
0.2
0
0
5
10
15
28 Vin
Case Temperature (ºC)
Load Current (A)
20
25
30
35
40
45
50
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-28-1R5S
Phone 1-888-567-9596
Figure 6: Output voltage vs. load current showing typical current limit
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