Datasheet > QHL750

QHL750

更新时间： 2022-02-26 10:37:35

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XPPOWER		/
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6页	679K
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DC-DC Converter

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QHL750 数据手册

DC-DC Converter

QHL750 Series

Application Notes

Thermal Resistance Information

Airflow Derating Graph - Without Heatsink

Power Dissipated vs Ambient Temperature and Air Flow

Natural Convection

20 ft./min. (0.1 m/s)

100 ft./min. (0.5 m/s)

Air Flow Rate

Natural Convection 20 ft/min (0.1 m/s)

100 ft/min (0.5 m/s)

Typical Rca

3.82 °C/W

3.23 °C/W

2.71 °C/W

2.28 °C/W

1.92 °C/W

1.68 °C/W

1.50 °C/W

1.35 °C/W

1.23 °C/W

200 ft./min. (1.0 m/s)

300 ft./min. (1.5 m/s)

400 ft./min. (2.0 m/s)

500 ft./min. (2.5 m/s)

600 ft./min. (3.0 m/s)

700 ft./min. (3.5 m/s)

800 ft./min. (4.0 m/s)

200 ft/min (1.0 m/s)

300 ft/min (1.5 m/s)

400 ft/min (2.0 m/s)

500 ft/min (2.5 m/s)

600 ft/min (2.5 m/s)

700 ft/min (2.5 m/s)

800 ft/min (2.5 m/s)

Ambient Temperature ,Ta(Deg. C)

Example (Without Heatsink)

To determine the minimum airflow necessary for a QHL750300S48 operating at an input voltage of 300 V, an output current of 11 A, and a maximum

ambient temperature of 25°C:

Determine Power dissipation (Pd):

Pd =48 V× 11 A×(1-0.91)/0.91 = 47.47

Pd = Pi-Po = Po(1-η)/η,

Where Pi = Input power, Po = Output Power and η = Efficiency

Determine airflow from airflow derating graph using data points for Pd=47.47 W and Ta = 25 °C

Minimum airflow= 800 ft./min.

To check that the maximum case temp of 85 °C is not exceeded:

Maximum temperature rise is

ΔT = Pd × Rca=47.47×1.23=58.38°C.

Maximum case temperature is

Tc=Ta+ΔT=83.38°C <85°C.

Where: Rca is the thermal resistance from case to ambient environment. Ta is ambient temperature and Tc is case temperature.

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