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 ≥ 10 µs.
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 ≥ 250 µs.
9. Input voltage rise time ≥ 250 µs.
10. 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.
11. After a disable or fault event, module is inhibited from restarting for 300 ms. See Shut Down section.
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 ESS table for details.
15. 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 TCASE.
16. Converter delivers current into a persisting short circuit for up to 1 second. See Current Limit in the Application Notes section.
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.
Product# MQFL-270-12D
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005043 Rev. F
08/21/13
Page 4
MQFL-270-12D
Output:
±12V
Current:
10A Total
Technical Figures
100
95
90
22
20
18
Power Dissipation (W)
16
14
12
10
8
6
4
2
155 Vin
270 Vin
400 Vin
0
20
40
60
80
100
120
Efficiency (%)
85
80
75
70
65
60
0
20
40
60
80
100
120
155 Vin
270 Vin
400 Vin
0
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 +12V output and 50% load on the -12V output 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 +12V output and 50% load on the -12V output at
minimum, nominal, and maximum input voltage at 25°C.
22
20
18
Power Dissipation (W)
90
16
14
12
10
8
6
4
2
0
155 Vin
270 Vin
400 Vin
Efficiency (%)
85
80
75
70
65
60
8/0
7/1
6/2
155 Vin
270 Vin
400 Vin
Load Current (A), +Iout
/
-Iout
5/3
4/4
3/5
2/6
1/7
0/8
8/0
7/1
6/2
5/3
4/4
3/5
2/6
1/7
0/8
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 +12V and -12V
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 +12V and
-12V outputs at minimum, nominal, and max input voltage at 25°C.
16
14
85
80
75
70
65
60
-55ºC
25ºC
85ºC
125ºC
155 Vin
270 Vin
400 Vin
Power Dissipation (W)
90
12
10
8
6
4
2
0
-55ºC
155 Vin
270 Vin
400 Vin
Efficiency (%)
25ºC
85ºC
125ºC
Case Temperature (ºC)
Case Temperature (ºC)
Figure 5: Efficiency at 60% load (3A load on +12V and 3A load on
-12V) versus case temperature for Vin = 155V, 270V, and 400V.
Product# MQFL-270-12D
Phone 1-888-567-9596
Figure 6: Power dissipation at 60% load (3A load on +12V and 3A load
on -12V) versus case temperature for Vin =155V, 270V, and 400V.
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