DC/DC Converter

URF1D_QB Series

2014.12.09-A/1

Page 4 of 8

MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation

0

10

20

30

40

50

60

70

80

-40

0

10

20

30

40

50

60

70

80

90

100

Ambient temperature(℃)

URF1D24QB-75W Thermal Curves (Vin=110V)

No Heatsink

Natural Convection

No Heatsink

200LFM

No Heatsink

400LFM

No Heatsink

1000LFM

0

10

20

30

40

50

60

70

80

-40

0

10

20

30

40

50

60

70

80

90

100

Ambient temperature(℃)

URF1D24QB-75WH Thermal Curves (Vin=110V)

Heatsink

Natural Convection

Heatsink

200LFM

Heatsink

400LFM

Heatsink

1000LFM

0

10

20

30

40

50

60

-40

0

10

20

30

40

50

60

70

80

90

100

Ambient temperature(℃)

URF1D24QB-50W Thermal Curves (Vin=110V)

No Heatsink

Natural Convection

No Heatsink

200LFM

No Heatsink

400LFM

No Heatsink

1000LFM

0

10

20

30

40

50

60

-40

0

10

20

30

40

50

60

70

80

90

100

Ambient temperature(℃)

URF1D24QB-50WH Thermal Curves (Vin=110V)

Heatsink

Natural Convection

Heatsink

200LFM

Heatsink

400LFM

Heatsink

1000LFM

Sense of application and precautions

1. When Remote Sense is not used

0V

+Vo

sense+

Trim

sense-

+

C

The lead as short as possible

Load

Short at pin root

Notes：

1) When remote sense is not used, make sure + Vo and Sense + are shorted, and that 0V and Sense- are shorted as well;

2) Keep the patterns between + Vo and Sense + and 0V and Sense- as short as possible. Avoid a looping pattern. If noise enters the loop, the operation of the

power module will become unstable.

2. When Remote Sense is used

0V

+Vo

sense+

Trim

sense-

A s far as possibl e u sin g t he twisted pair

Load

+

C

Notes:

1. Using remote sense with long wires may cause output voltage to become unstable. Consult us if long sensing wiring is necessary.

2. Sense patterns or wires should be as short as possible. If wires are used, use either twisted-pair or shielded wires.

3. Please Use wide PCB trace or a thick wires between the power supply module and the load, the line voltage drop should be kept less than 0.3V. Make sure

the power supply module's output voltage remains within the specified range.

4. The impedance of wires may cause the output the voltage oscillation or have a greater ripple, please do adequate assessments before using.