HBT060ZGHH Datasheet, PDF (6/12 Pages) Power-One – HBT Series . Half-Brick DC/DC Converter 48V Input 60 Watt Triple Output

HBT Series – Half-Brick DC/DC Converter
48V Input
60 Watt Triple Output
Data Sheet
substrate temperature versus local ambient
temperature (T_A).
Thermal Considerations
The power converter operates in various thermal
environments. Sufficient cooling should be
provided to help ensure reliable operation of the
converter. Major heat-dissipating components are
thermally coupled to the metal substrate. Heat is
removed from the metal substrate by conduction,
convection, and radiation to the surrounding
environment. Proper cooling can be verified by
measuring the temperature of the substrate. It is
recommended the substrate temperature be
maintained below 100 ºC for reliable operation.
When necessary, an additional heat sink can be
attached to the substrate to achieve desired
thermal performance.
Heat Transfer Characteristics
Increasing airflow over the converter enhances
the heat transfer via convection. Figure 4 shows
the maximum power that can be dissipated by the
converter without exceeding the maximum
Test Setup
TO CURRENT PROBE
Use of Figures 4 and 5 to properly determine
proper airflow for cooling the converter at a given
output power and a maximum ambient
temperature is illustrated in the following example.
Example
What is the minimum airflow required for the
device operating with an input voltage range of
33V to 75V, an output power of 60 W, at a
maximum ambient temperature of 70 ºC?
Solution:
Given: Vi = 33V-75V, Po = 60 W, T_A = 70 ºC.
Step 1 (Determining P_D): From Figure 5,
the maximum power dissipation is 12W (occurs at
Vin = 33V)
Step 2 (Determine airflow): From Figure
4, to maintain the substrate temperature below
100C, the airflow has to be greater than 160LFM
(interpolated between curves for 100LFM and
200LFM).
BATTERY
Ltest
12 uH
Cs 220 uF
ESR < 0.1 OHM
@ 20 ºC, 100
kHz
22uF
ESR < 0.7 OHM
@ 20 ºC, 100 kHz
Vi(+)
Vi(-)
Figure 1 Input Reflected Ripple Current Test Set-up:
Note: Measure input reflected-ripple current with a simulated inductance (Ltest) of 12 uH. Capacitor Cs offsets possible
battery impedance. Measure current as shown above.
REV. 10/01
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