DAK-68A Power Integrations, DAK-68A Datasheet - Page 20

• Manufacturer Part Number: DAK-68A
• Description: KIT DESIGN ACCELERATOR POE CONV
• Manufacturer: Power Integrations
• Series: DPA-Switch®r

Specifications of DAK-68A

• Main Purpose: Special Purpose DC/DC, Power Over Ethernet
• Outputs And Type: 1, Non-Isolated
• Power - Output: 6.6W
• Voltage - Output: 3.3V
• Current - Output: 2A
• Voltage - Input: 36 ~ 57V
• Regulator Topology: Flyback
• Frequency - Switching: 400kHz
• Board Type: Bare (Unpopulated) and Fully Populated
• Utilized Ic / Part: DPA423, DPA424, DPA425
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 596-1007

11 Thermal Performance
The temperatures of key components were recorded using T-type thermocouples. Two
of the four thermocouples were soldered; one directly to a SOURCE pin of the DPA423G
(U1) and the other to the cathode of the output rectifier (D1). The other two
thermocouples were glued; one to the transformer (T1) core, on the center leg, and the
other to the case of the first (of the two) high-ripple output capacitor (C7).
The unit was operated at full load, at 36 VDC, 48 VDC and 57 VDC, in free convection
within a small enclosure.
The results show adequate thermal margin, considering an additional ambient rise of
+28 °C, equivalent to operating at an ambient of 50 °C. At 36 VDC, full load, within an
enclosure at 50 °C ambient, this equates to a DPA423G case temperature of 79 °C. This
is well below the recommended maximum case temperature of 100 °C.
Figure 24 is an infrared thermograph taken at nominal-line (48 VDC).
Power Integrations
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Ambient
DPA423G (U1)
Transformer core (T1)
Output Rectifier (D1)
Output Capacitor (C7)
Item
Measured Temperature (
36 VDC 48 VDC 57 VDC
22
51
75
63
45
°
22
51
75
61
43
C)
22
53
75
61
43
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