EPR-21 datasheet(19/32 Pages) POWERINT

19 / 32 page

19-Nov-02

EPR-21 – 5 V, 30 W DC-DC Converter

11 Thermal Performance

Thermal performance of the EP-21 was measured in still air at room temperature with no

heat sink and with a Wakefield 628-65AB heat sink attached to the aluminum substrate

using Berquist Bond Ply 105 thermal adhesive. The supply was also tested in still air in a

thermal chamber with the ambient temperature adjusted for 110

°C base plate

temperature, both with and without a heat sink. The results are tabulated below.

Input Voltage

36 VDC

48 VDC

72 VDC

Item

Ambient

°C

DPA-Switch (U1)

°C

64.5

°C

Transformer (T1)

°C

Output Choke (L2)

°C

68.5

°C

Output Rectifier (D2)

°C

Base Plate

°C

Figure 12 – EP-21 Thermal Performance with Attached Heat Sink,

Room Temperature, Maximum Load.

Input Voltage

36 VDC

48 VDC

72 VDC

Item

Ambient

°C

82.5

°C

DPA-Switch (U1)

115

° C

113

° C

113

°C

Transformer (T1)

116

°C

115

°C

117

°C

Output Choke (L2)

112.5

°C

113

°C

118

°C

Output Rectifier (D2)

113

°C

113

°C

117

°C

Base Plate

110

°C

110

°C

110

°C

Figure 13 – EP-21 Thermal Performance with Attached Heat Sink, Ambient

Temperature Adjusted for 110

°C Base Plate Temperature.

Input Voltage

36 VDC

48 VDC

72 VDC

Item

Ambient

°C

DPA-Switch (U1)

°C

Transformer (T1)

°C

81.5

°C

Output Choke (L2)

°C

Output Rectifier (D2)

°C

90.5

°C

Base Plate

°C

Figure 14 – EP-21 Thermal Performance, No Heat Sink, Room Temperature,

Maximum Load.

Page 19 of 32

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