Technical Specification
100
98
10
9
Input:
Output:
Current:
Package:
42-53 V
12 V
20 A
Quarter-brick
Efficiency (%)
94
92
90
88
86
84
82
80
0
2
4
6
8
10
12
14
16
18
20
42 Vin
48 Vin
52 Vin
Power Dissipation (W)
96
8
7
6
5
4
3
2
1
0
0
2
4
6
8
10
12
14
16
42 Vin
48 Vin
52 Vin
18
20
Load Current (A)
Load Current (A)
Figure 1:
Efficiency at nominal output voltage vs. load current for min-
imum, nominal, and maximum input voltage at 25
°
C.
Figure 2:
Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25
°
C.
98
15
14
97
Output Voltage (V)
13
12
11
10
42Vin
9
8
0
2
4
6
8
10
12
14
16
18
20
48Vin
52Vin
Efficiency
(%)
96
95
94
93
25 C
40 C
55 C
0
100
200
300
400
500
92
Air Flow
(LFM)
Load Current (A)
Figure 3:
Efficiency at nominal output voltage and 60% rated power vs.
airflow rate for ambient air temperatures of 25
°
C, 40
°
C, and 55
°
C
(nominal input voltage).
20
18
16
14
Figure 4:
Output voltage regulation vs. load current for minimum, nom-
inal, and maximum input voltage at 25
°
C.
I
out
(A)
12
10
8
6
4
2
0
0
25
40
55
o
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0 LFM (0 m/s)
70
85
Ambient Air Temperature ( C)
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 5:
Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 0 LFM through 400 LFM with air flowing
from pin 3 to pin 1 (nominal input voltage).
Product # BQ50120QTA20
Phone 1-888-567-9596
Figure 6:
Thermal plot of converter at 20 amp load current (240W)
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).
Doc.# 005-2BQ512J Rev. E
03/17/06
Page 5
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