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## HBT060ZGHH Datasheet(PDF) 6 Page - Power-One

 Part No. HBT060ZGHH Description HBT Series . Half-Brick DC/DC Converter 48V Input 60 Watt Triple Output Download 12 Pages Scroll/Zoom 100% Maker POWER-ONE [Power-One] Homepage http://www.power-one.com Logo

## HBT060ZGHH Datasheet(HTML) 6 Page - Power-One

 6 / 12 page Data SheetHBT Series – Half-Brick DC/DC Converter48V Input60 Watt Triple OutputREV. 10/01Page 6 of 12www.power-one.comThermal ConsiderationsThe power converter operates in various thermalenvironments.Sufficientcoolingshouldbeprovided to help ensure reliable operation of theconverter. Major heat-dissipating components arethermally coupled to the metal substrate. Heat isremoved from the metal substrate by conduction,convection, and radiation to the surroundingenvironment. Proper cooling can be verified bymeasuring the temperature of the substrate. It isrecommendedthesubstratetemperaturebemaintained below 100 ºC for reliable operation.When necessary, an additional heat sink can beattached to the substrate to achieve desiredthermal performance.Heat Transfer CharacteristicsIncreasing airflow over the converter enhancesthe heat transfer via convection. Figure 4 showsthe maximum power that can be dissipated by theconverterwithoutexceedingthemaximumsubstratetemperatureversuslocalambienttemperature (TA).Use of Figures 4 and 5 to properly determineproper airflow for cooling the converter at a givenoutputpowerandamaximumambienttemperature is illustrated in the following example.ExampleWhat is the minimum airflow required for thedevice operating with an input voltage range of33V to 75V, an output power of 60 W, at amaximum ambient temperature of 70 ºC?Solution:Given: Vi = 33V-75V, Po = 60 W, TA = 70 ºC.Step 1 (Determining PD): From Figure 5,the maximum power dissipation is 12W (occurs atVin = 33V)Step 2 (Determine airflow): From Figure4, to maintain the substrate temperature below100C, the airflow has to be greater than 160LFM(interpolated between curves for 100LFM and200LFM).Test SetupFigure 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 possiblebattery impedance. Measure current as shown above.BATTERYCs 220 uFESR < 0.1 OHM@ 20 ºC, 100kHzLtest12 uH22uFESR < 0.7 OHM@ 20 ºC, 100 kHzVi(+)Vi(-)TO CURRENT PROBE

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