1. Converter will undergo input over-voltage shutdown.
2. Derate output power for continuous operation per Figure 5. 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 ±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. The regulation stage operate to control the positive output. The negative output displays cross regulation.
12. All +Vout and -Vout voltage measurements are made with Kelvin probes on the output leads.
13. SHARE pin outputs a power failure warning pulse during a fault condition. See Current Share section.
14. 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.
Technical Specification
Vin=28V dc ±5%, +Iout = -Iout = 12A, CL=0µF, free
running (see Note 10) unless otherwise specified
Group A
Subgroup
(see Note 14)
1,
1,
1,
1,
1,
1,
1,
1,
1,
2,
2,
2,
2,
2,
2,
2,
2,
2,
3
3
3
3
3
3
3
3
3
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
See Note 5
15. These derating curves apply for the ES and HB grade products. The C- grade product has a maximum case temperature of 70ºC.
16. Input Over Voltage Shutdown test is run at no load, full load is beyond derating condition and could cause damage at 125ºC.
Product# MQFL-28E-05D
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005158 Rev. C
17. 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.
08/20/13
Page 4
MQFL-28E-05D
Output:
±5.0V
Current:
24A Total
Technical Figures
100
95
90
24
20
Power Dissipation (W)
Efficiency (%)
85
80
75
70
65
60
16
28
40
70
Vin
Vin
Vin
Vin
16
12
8
4
0
16
28
40
70
Vin
Vin
Vin
Vin
0
12
24
36
48
60
72
84
96
108
120
0
12
24
36
48
60
72
84
96
108
120
Total Output Power (W)
Total Output Power (W)
Figure 1:
Efficiency vs. output power, from zero load to full load with
equal load on the +5V and -5V outputs at minimum, nominal, and
maximum input voltage at 25°C.
100
95
Figure 2:
Power dissipation vs. output power, from zero load to full load
with equal load on the +5V and -5V outputs at minimum, nominal, and
maximum input voltage at 25°C.
24
20
Power Dissipation (W)
90
Efficiency (%)
85
80
75
70
65
60
19.2/0
16
28
40
70
Vin
Vin
Vin
Vin
16
12
8
4
0
19.2/0
16 Vin
28 Vin
40 Vin
70 Vin
16.8/2.4 14.4/4.8
12/7.2
9.6/9.6
7.2/12
4.8/14.4 2.4/16.8
0/19.2
16.8/2.4 14.4/4.8
12/7.2
9.6/9.6
7.2/12
4.8/14.4 2.4/16.8
0/19.2
Load Current (A), +Iout
/
-Iout
Load Current (A), +Iout
/
-Iout
Figure 3:
Efficiency vs. output current, with total output current fixed
at 80% load (96W) and loads split as shown between the +5V and -5V
outputs at minimum, nominal, and maximum input voltage at 25°C.
100
95
Figure 4:
Power dissipation vs. output current, with total output current
fixed at 80% load (96W) and loads split as shown between the +5V and
-5V outputs at minimum, nominal, and max input voltage at 25°C.
24
16 Vin
Power Dissipation (W)
90
20
28 Vin
40 Vin
70 Vin
Efficiency (%)
85
80
75
70
65
60
-55ºC
16 Vin
28 Vin
40 Vin
70 Vin
16
12
8
25ºC
125ºC
4
-55ºC
25ºC
125ºC
Case Temperature (ºC)
Case Temperature (ºC)
Figure 5:
Efficiency at 60% load (7.2A load on +5V and 7.2A load on
-5V) versus case temperature for Vin = 16V, 28V, 40V, and 70V.
Product# MQFL-28E-05D
Phone 1-888-567-9596
Figure 6:
Power dissipation at 60% load (7.2A load on +5V and 7.2A
load on -5V) versus case temperature for Vin =16V, 28V, 40V, and 70V.
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