Vin=28V dc ±5%, Iout=20A, CL=0µF, free running (see Note 10) unless
otherwise specified
Technical Specification
Group A
Subgroup
1
1
1
1
1
1
ad
pu
va
bl
ic n
at ce
io d
n
44
500
550
600
700
10
0.8
80
kHz
kHz
V
V
%
mA
%
V
µA
V
µA
V
1, 2, 3
500
2.0
-0.5
20
20
25
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
VSYNC OUT = 0.8V
Output connected to SYNC IN of other MQFL unit
0.8
80
2
Current drain required to ensure module is off
Imax drawn from pin allowed, module on
See Figure A
3.2
4.0
20
4.5
2800
440
79
10
3
Hrs.
10
3
Hrs.
g
Product# MQFL-28E-06S
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www.SynQor.com
Doc.# 005-0005144 Rev. 3
08/14/13
Electrical Characteristics Notes
1. Converter will undergo input over-voltage shutdown.
2. Derate output power to 50% of rated power at Tcase = 135ºC (see 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. SHARE pin outputs a power failure warning pulse during a fault condition. See Current Share section of the Control Features description.
12. After a disable or fault event, module is inhibited from restarting for 300ms. See Shut Down 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.
15. Input Over Voltage Shutdown test is run at no load, full load is beyond derating condition and could cause damage at 125ºC.
16. 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.
Page 4
MQFL-28E-06S
Output:
6V
Current:
20A
Technical Figures
100
95
90
100
95
90
ad
pu
va
bl
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80
75
70
65
60
80
75
70
65
16 Vin
28 Vin
40 Vin
70 Vin
16
28
40
70
Vin
Vin
Vin
Vin
Efficiency (%)
85
Efficiency (%)
85
0
2
4
6
8
10
12
14
16
18
20
60
-55ºC
25ºC
125ºC
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.
24
21
18
15
12
Figure 2: Efficiency at nominal output voltage and 60% rated power vs.
case temperature for input voltage of 16V, 28V, 40V ,and 70V.
24
21
18
15
12
Power Dissipation (W)
Power Dissipation (W)
9
6
3
0
9
6
3
16 Vin
28 Vin
40 Vin
70 Vin
16
28
40
70
Vin
Vin
Vin
Vin
0
2
4
6
8
10
12
14
16
18
20
0
-55ºC
25ºC
125ºC
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.
25
150
Figure 4: Power dissipation at nominal output voltage and 60% rated
power vs. case temperature for input voltage of 16V, 28V, 40V ,and 70V.
7
6
5
4
3
2
1
0
20
120
Iout (A)
10
5
0
Tmax = 105ºC, Vin = 70
Tmax = 105ºC, Vin = 50
Tmax = 105ºC, Vin = 28
Tmax = 125ºC, Vin = 70
Tmax = 125ºC, Vin = 50
Tmax = 125ºC, Vin = 28
Tmax = 145ºC, Vin = 70
Tmax = 145ºC, Vin = 50
Tmax = 145ºC, Vin = 28
60
30
Pout (W)
15
90
Output Voltage (V)
28 Vin
0
25
35
45
55
65
75
85
95
105
115
125
135
145
Case Temperature (ºC)
0
4
8
Load Current (A)
12
16
20
24
28
Figure 5: Output Current / Output Power derating curve as a function of
Tcase and the Maximum desired power MOSFET junction temperature
(see Note 14).
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Figure 6: Output voltage vs. load current showing typical current limit
