JUN 06, 2006 revised to JUL 25, 2006

Page 11 of 12

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HHS60 DC-DC Series Data Sheet

48VDC Input, 60 Amp Half-Brick Converter

voltages.

The entire system, including the

HHS60 converter, must pass a dielectric

withstand test for Reinforced insulation. Design

of this type of systems requires expert

engineering and under-standing of the overall

safety requirements and should be performed by

qualified personnel.

Thermal Considerations

The HHS60 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 120 °C to ensure reliable long-

term operation of the converters.

The graphs in Figures 5 thru 8 show the maximum

output current of the HHS60 Series converters at

different ambient temperatures under both natural

and forced convection. (longitudinal airflow direction,

from pin 1 to pin 4).

Test Setup

Figure 18. Input Reflected Ripple Current Test Setup

Note: Measure input reflected-ripple current with a simulated

inductance (Ltest) of 12 µH. Capacitors offset possible battery

impedance. Measure current as shown above

BATTER

Y

Cs 220 uF

ESR < 0.1 OHM

@ 20 ºC, 100

kHz

Ltest

12 uH

22 uF

ESR < 0.7 OHM

@ 20 ºC, 100 kHz

Vi(+)

Vi(-)

TO OSCILLOSCOPE