HBC25ZH-NT Datasheet, PDF (6/7 Pages) Power-One – HBC DC-DC Series Data Sheet 300-Watt Half-Brick Converters

HBC DC-DC Series Data Sheet
300-Watt Half-Brick Converters
Thermal Considerations
The HBC Series converters are designed for natural or
forced convection cooling. The maximum allowable
output current of the converters is determined by
meeting the derating criteria for all components used in
the converters. For example, the maximum
semiconductor
junction temperature is not allowed to exceed 125°C to
ensure reliable long-term operation of the converters.
Contact Power-One for the complete list of the derating
criteria.
The graph in Figure 4 shows the maximum output
current of the HBC Series converter at different ambient
temperatures under both natural and forced
(longitudinal airflow direction, from pin 1 to pin 4)
convection.
THERMAL DERATING CURVE
HBC25ZH-T, -NT
Vin = 54V, Orientation : Vin- to Vin +
30
25
20
15
10
5
NC (25 - 35 LFM)
100 LFM
200 LFM
300 LFM
400 LFM
0
25
40
55
70
Ambient Temperature (Deg C)
Data Rev: 01
85
Figure 4. HBC25ZH-T, NT Derating Curves
For example, from Figure 4, the HBC25ZH
operating at 45ºC can deliver up to 19A reliably
with 200LFM forced air, while up to 23A reliably
with 400LFM forced air.
REV. DEC 15, 2003
www.power-one.com
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