BMP Models
25-40W ,
DU AL
OUTPUT
DC/DC
CONVER TERS
5
40
35
30
25
20
15
10
5
0
O
u
tp
u
tP
o
w
e
r(W
a
tts
)
Ambient Temperature (°C)
–40
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Natural Convection Cooling
150 Linear Feet Per Minute
300 Linear Feet Per Minute
Figure 5a. Temperature Derating Without Heat Sink
Figure 5b. Temperature Derating With Heat Sink
D48 Models (40 Watts)
O
u
tp
u
tP
o
w
e
r(W
a
tts
)
Ambient Temperature (°C)
40
35
30
25
20
15
10
5
0
–40
0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Natural Convection Cooling
150 Linear Feet Per Minute
300 Linear Feet Per Minute
Temperature Derating and Electrical Performance Curves
Voltage
Output
Model Number
Range
Power
±5V Currents
±12V Currents
±15V Currents
BMP-5/4-Q12
10-36V
25 Watts
±2.5A (25W)
–
BMP-5/4-Q48
18-75V
30 Watts
±3A (30W)
–
BMP-5/4-D24
18-36V
35 Watts
±3.5A (35W)
–
BMP-5/4-D48
36-75V
40 Watts
±4A (40W)
–
BMP-12/1.65-Q12
10-36V
25 Watts
–
±1.04A (24.96W)
–
BMP-12/1.65-Q48
18-75V
30 Watts
–
±1.25A (30W)
–
BMP-12/1.65-D24
18-36V
35 Watts
–
±1.46A (35W)
–
BMP-12/1.65-D48
36-75V
40 Watts
–
±1.67A (40.1W)
–
BMP-15/1.3-Q12
10-36V
25 Watts
–
±833mA (24.99W)
BMP-15/1.3-Q48
18-75V
30 Watts
–
±1A (30W)
BMP-15/1.3-D24
18-36V
35 Watts
–
±1.17A (35.1W)
BMP-15/1.3-D48
36-75V
40 Watts
–
±1.33A (39.9W)
Definition of "Full Load" for Specification Purposes
Output Power
BMP Model, dual-output DC/DC converters incorporate a design tradeoff
between total available output power and input voltage range. The total
available power is a function of both the nominal input voltage and the
"width" of the input voltage range. For a given nominal input (24V or 48V),
narrower ranges (2:1 vs. 4:1) have more available power. For a given "width"
of input range (2:1 or 4:1), higher nominal inputs (48V vs. 24V) have more
available power. Each device, as indicated by its part-number suffix (Q12, Q48,
D24 or D48) has a total output power limitation of 25, 30, 35 or 40 Watts,
respectively. Observing these power limitations is the user's responsibility.
As indicated by its Part Number Structure, each ±5V, ±12V or ±15V BMP
device is capable of sourcing up to ±4, ±1.65 or ±1.3 Amps, respectively.
Users have the flexibility of loading either output up to these limits; however
you must be extremely careful not to exceed the total output power rating of
any given device. If, for example, a ±5V device with a 30W power rating
(BMP-5/4-Q48) is sourcing 4A from its +5V output (representing 20W of
+Output power), that device can only supply an additional 10W (2 Amps)
from its –Output.
As a consequence of this "power-allocation" flexibility, the definition of "full
load," as the condition under which performance specifications are tested and
listed, is ambiguous. The following table lists the positive and negative output
currents that DATEL uses to define each device’s "full load."
Table 1. Output Currents Comprising "Full Load"