RD7 Ver la hoja de datos (PDF) - Power Integrations, Inc
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RD7
Power Integrations, Inc
RD7 Datasheet PDF : 12 Pages
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Thermal Considerations
The RD7 utilizes the printed circuit copper for TOPSwitch-II
heatsinking. With a copper area of approximately 0.227 in2
(1.46 cm2 ) and 2 oz. (610 g/m2) copper cladding, the temperature
of the TOPSwitch-II rises 6 oC at 50 oC ambient temperature
and 3.5 W load.
Transformer Specifications
The electrical specifications and construction details for
transformer TRD7 are shown in Figures 13 and 14. Transformer
TRD7 is supplied with the RD7 reference design board. This
design utilizes an EE16 core and a triple insulated wire secondary
RD7
winding. The use of triple insulated wire allows the transformer
to be constructed using a smaller core and bobbin than a conven-
tional magnet wire design due to the elimination of the creepage
margins required for safety spacing in a conventional design.
If a conventional margin wound transformer is desired, the
design of Figures 15 and 16 can be used. This design (TRD7-1)
uses an EEL16 core and bobbin to accommodate the 6 mm
creepage required to meet international safety standards when
using magnet wire rather than triple insulated wire, and has the
same pinout and printed circuit foot print as TRD7. The
transformer is approximately 50% taller than the triple insulated
wire design due to the inclusion of creepage margins required
to meet international safety standards.
105
VIN = 155 VDC
100
95
0
105
100 200 300 400 500 600 700
(a) 5 V Load Current (mA)
VIN = 310 VDC
100
95
0
100 200 300 400 500 600 700
(b) 5 V Load Current (mA)
Figure 5 (a). Load Regulation at 155 VDC Input Voltage.
(b). Load Regulation at 310 VDC Input Voltage.
105
100
95
80
105
240
400
(a) Input Voltage (VDC)
100
95
80
240
400
(b) Input Voltage (VDC)
Figure 6 (a). Line Regulation at 3.5 W Output.
(b). Line Regulation at 0.35 W Output.
80
70
60
50
40
30
80
Po = 3.5 W
240
400
Input Voltage (VDC)
Figure 7. Efficiency vs. Input Voltage, 3.5 W Output.
5 B
4/99
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