Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
100
95
90
85
80
75
70
20
18
16
14
12
10
8
6
35 Vin
48 Vin
55 Vin
35 Vin
48 Vin
55 Vin
4
2
0
0
5
10
15
20
25
30
35
40
0
5
10
15
20
25
30
35
40
Load Current (A)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for min-
Figure 2: Power dissipation at nominal output voltage vs. load current
imum, nominal, and maximum input voltage at 25
°
C.
for minimum, nominal, and maximum input voltage at 25°C.
98
12
10
8
97
96
95
94
6
4
25 ºC
40 ºC
55 ºC
35V
2
0
48V
55V
100
200
300
400
0
5
10
15
20
25
30
35
40
Air Flow (LFM)
Load Current (A)
Figure 3: Efficiency at nominal output voltage and 60% rated power vs.
Figure 4: Output voltage regulation vs. load current for minimum, nom-
inal, and maximum input voltage at 25 C.
airflow rate for ambient air temperatures of 25
(nominal input voltage).
°C, 40
°C, and 55
°C
°
45
40
35
30
25
20
15
400 LFM (2.0 m/s)
10
5
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0
Semiconductor junction temperature is
within 1 C of surface temperature
25
40
55
Ambient Air Temperature (ºC)
70
85
°
Figure 5: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 100 LFM through 400 LFM with air flow-
ing from pin 3 to pin 1 (nominal input voltage).
Figure 6: Thermal plot of converter at 43 amp load current (400W)
with 55 C air flowing at the rate of 200 LFM. Air is flowing across the
converter from pin 3 to pin 1 (nominal input voltage).
°
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 5
SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
