HW012A0P1 Datasheet, PDF (16/23 Pages) Lineage Power Corporation – 36-75 Vdc Input; 1.2 Vdc to 5 Vdc Output; 6.6A to 12A

Data Sheet
June 26, 2009
HW006/010/012 Series Power Modules; dc-dc Converters
36-75 Vdc Input; 1.2 Vdc to 5 Vdc Output; 6.6A to 12A
Thermal Considerations
The power modules operate in a variety of thermal environ-
ments; however, sufficient cooling should be provided to help
ensure reliable operation of the unit. Heat is removed by con-
duction, convection, and radiation to the surrounding environ-
ment. Proper cooling can be verified by measuring drain pin
Q203 at the position indicated in Figure 43.
The temperature at Q203 drain pins should not exceed 115
°C. The output power of the module should not exceed the
rated power for the module
(VO, set x IO, max).
Although the maximum operating ambient temperature of the
power modules is 85 °C, you can limit this temperature to a
lower value for extremely high reliability.
12
10
8
6
2.0 m/s (400 ft./min.)
1.0 m/s (200 ft./min.)
0.5 m/s (100 ft./min.)
4
NATURAL CONVECTION
2
0
20
30
40
50
60
70
80
90
Ambient Temperature TA (˚C)
Figure 44. Derating Curves for HW010A0F1
(VO = 3.3 V) in Transverse Orientation
(VI = 48 Vdc).
Attach thermocouple
to drain lead.
AIRFLOW
Figure 43. HW 6.6A-12A-Series Temperature
Measurement Location (Top View).
Heat Transfer via Convection
Increasing airflow over the module enhances the heat trans-
fer via convection. Figures 44—48 show the maximum cur-
rent that can be delivered by various modules versus local
ambient temperature (TA) for natural convection through 2 m/
s (400 ft./min.).
Systems in which these power modules may be used typi-
cally generate natural convection airflow rates of 0.3 ms^–1
(60 ft./min.) due to other heat-dissipating components in the
system. Therefore, the natural convection condition repre-
sents airflow rates of up to 0.3 ms^–1 (60 ft./min.). Use of Fig-
ure 44 is shown in the following example.
Example
What is the minimum airflow necessary for a HW010A0F1
operating at VIN = 48 V, an output current of 10 A, and a
maximum ambient temperature of 75 °C.
Solution
Given: VIN = 48V
IO = 12 A
TA = 75 °C
Determine airflow (v) (Use Figure 44.):
v = 0.5 m/s (100 ft./min.)
8
7
6
5
2.0 m/s (400 ft./min.)
1.0 m/s (200 ft./min.)
4
0.5 m/s (100 ft./min.)
NATURAL CONVECTION
3
2
1
0
20
30
40
50
60
70
80
90
AMBIENT TEMPERATURE, TA (˚C)
Figure 45. Derating Curves for HW006A6A1
(VO = 5.0 V) in Transverse Orientation
(VI = 48 Vdc).
11
10
9
8
2.0 m/s (400 ft./min.)
7
1.0 m/s (200 ft./min.)
6
0.5 m/s (100 ft./min.)
NATURAL CONVECTION
5
4
3
2
1
0
20
30
40
50
60
70
80
90
AMBIENT TEMPERATURE, TA (˚C)
Figure 46. Derating Curves for HW010A0G1
(VO = 2.5 V) in Transverse Orientation
(VI = 48 Vdc).
Lineage Power
16