DAK-21A Power Integrations, DAK-21A Datasheet - Page 19

• Manufacturer Part Number: DAK-21A
• Description: KIT DESIGN ACCELERATOR DPA SW
• Manufacturer: Power Integrations
• Series: DPA-Switch®r

Specifications of DAK-21A

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Isolated
• Voltage - Output: 5V
• Current - Output: 6A
• Voltage - Input: 36 ~ 72V
• Regulator Topology: Buck
• Frequency - Switching: 400kHz
• Board Type: Fully Populated
• Utilized Ic / Part: DPA423, DPA424, DPA425, DPA426
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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
temperature, both with and without a heat sink. The results are tabulated below.
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Figure 12 – EP-21 Thermal Performance with Attached Heat Sink,
Figure 13 – EP-21 Thermal Performance with Attached Heat Sink, Ambient
Figure 14 – EP-21 Thermal Performance, No Heat Sink, Room Temperature,
Input Voltage
Item
Ambient
DPA-Switch (U1)
Transformer (T1)
Output Choke (L2)
Output Rectifier (D2)
Base Plate
Input Voltage
Item
Ambient
DPA-Switch (U1)
Transformer (T1)
Output Choke (L2)
Output Rectifier (D2)
Base Plate
Input Voltage
Item
Ambient
DPA-Switch (U1)
Transformer (T1)
Output Choke (L2)
Output Rectifier (D2)
Base Plate
Room Temperature, Maximum Load.
Temperature Adjusted for 110 C Base Plate Temperature.
Maximum Load.
112.5 C
36 VDC
36 VDC
36 VDC
115 C
116 C
113 C
110 C
25 C
68 C
67 C
67 C
73 C
66 C
76 C
30 C
87 C
86 C
82 C
95 C
86 C
Tel: [phone] Fax: [phone]
48 VDC
48 VDC
48 VDC
64.5 C
113 C
115 C
113 C
113 C
110 C
25 C
64 C
67 C
71 C
63 C
77 C
30 C
82 C
82 C
80 C
91 C
81 C
72 VDC
72 VDC
72 VDC
68.5 C
82.5 C
81.5 C
90.5 C
113 C
117 C
118 C
117 C
110 C
25 C
64 C
64 C
72 C
62 C
29 C
80 C
82 C
80 C
Power Integrations, Inc.
www.powerint.com
C base plate