1. Converter will undergo input over-voltage shutdown.
2. Derate output power to 50% of rated power at Tcase = 135ºC. 135ºC is above the specified operating range. See Figure 5.
3. High or low state of input voltage must persist for about 200µs to be acted on by the shutdown circuitry.
4. Current limit inception is defined as the point where the output voltage has dropped to 90% of its nominal value. See Current Limit discussion in
Features Description section.
5. Parameter not tested but guaranteed to the limit specified.
6. Load current transition time ≥ 10µs.
7. Line voltage transition time ≥ 100µs.
8. Input voltage rise time ≤ 250µs.
9. 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.
10. After a disable or fault event, module is inhibited from restarting for 100ms. See Shut Down section of the Control Features description.
11. 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.
12. These derating curves apply for the ES and HB grade products. The C grade product has a maximum case temperature of 70ºC.
13. 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# MQHL-28-3R3S
Phone 1-888-567-9596
www.SynQor.com
Doc.# 005-0005077 Rev. D
08/14/13
Page 4
MQHL-28-3R3S
Output:
3.3V
Current:
15A
Technical Figures
100
95
90
100
95
90
Efficiency (%)
Efficiency (%)
85
80
75
70
65
60
0
3
6
9
12
15
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
minimum, nominal, and maximum input voltage at Tcase=25°C.
12
10
Figure 2:
Efficiency at nominal output voltage and 60% rated power vs.
case temperature for input voltage of 16V, 28V, and 40V.
12
10
Power Dissipation (W)
8
6
4
16 Vin
2
0
0
3
6
9
12
15
28 Vin
40 Vin
Power Dissipation (W)
8
6
4
16 Vin
2
28 Vin
40 Vin
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.
18
15
12
60
50
40
Figure 4:
Power dissipation at nominal output voltage and 60% rated
power vs. case temperature for input voltage of 16V, 28V, and 40V.
3.6
3.0
9
6
Tjmax = 105º C
3
0
25
45
65
85
105
125
Tjmax = 125º C
Tjmax = 145º C
30
20
10
0
145
Output Voltage (V)
2.4
Iout (A)
Pout (W)
1.8
1.2
0.6
0.0
0
2
4
6
Case Temperature (ºC)
Load Current (A)
8
10
12
14
16
18
20
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 12).
Product# MQHL-28-3R3S
Phone 1-888-567-9596
Figure 6:
Output voltage vs. load current showing typical current limit
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