TMP Models
Triple Output, High-Efﬁciency, Smaller-Package, 25-40 Watt, DC/DC Converters
Temperature Derating and Electrical Performance Curves
D48 Models (40 Watts)
40
35
30
25
20
15
Natural Convection Cooling
10
150 Linear Feet Per Minute
300 Linear Feet Per Minute
5
0
–40 0 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
Ambient Temperature (°C)
Figure 5a. Temperature Derating Without Heat Sink
40
35
30
25
20
15
Natural Convection Cooling
150 Linear Feet Per Minute
10
300 Linear Feet Per Minute
5
0
–40 0 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
Ambient Temperature (°C)
Figure 5b. Temperature Derating With Heat Sink
Output Power
TMP Model, triple-output DC/DC converters incorporate a design tradeoff be-
tween 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, 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 TMP device is capable of
sourcing up to 5 Amps of +5V current as well as ±1 Amp of auxiliary (±12V
or ±15V) currents. Users have the ﬂexibility of loading any 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 device with a 30W power
rating is sourcing 4A from its +5V output (representing 20W of primary output
power), that device can only supply an additional 10W from its auxiliary outputs
(±333mA from ±15V outputs or ±417mA from ±12V outputs).
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 primary and auxiliary
output currents that DATEL uses to deﬁne each device’s "full load."
Model Number
TMP-5/5-12/1-Q12
TMP-5/5-12/1-Q48
TMP-5/5-12/1-D24
TMP-5/5-12/1-D48
TMP-5/5-15/1-Q12
TMP-5/5-15/1-Q48
TMP-5/5-15/1-D24
TMP-5/5-15/1-D48
Voltage
Range
10-36V
18-75V
18-36V
36-75V
10-36V
18-75V
18-36V
36-75V
Output
Power
25 Watts
30 Watts
35 Watts
40 Watts
25 Watts
30 Watts
35 Watts
40 Watts
Deﬁnition of "Full Load" for Speciﬁcation Purposes
+5V Current
±12V Currents
±15V Currents
2.6A (13W)
3A (15W)
4A (20W)
4A (20W)
2.5A (12.5W)
3A (15W)
4A (20W)
4A (20W)
±500mA (12W)
±625mA (15W)
±625mA (15W)
±833mA (20W)
–
–
–
–
–
–
–
–
±417mA (12.5W)
±500mA (15W)
±500mA (15W)
±667mA (20W)
Table 1. Output Currents Comprising "Full Load"
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