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11July2018/Version 1

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LES series

Maximum continuous DC primary current

The maximum continuous DC primary current plot shows the boundary of the area for which all the following conditions are true:

- I

P < IP M

- Junction temperature T

J < 125 °C

- Primary conductor temperature < 110 °C

- Resistor power dissipation < 0.5 × rated power

Frequency derating

Figure 21: I

P vs TA for LES 6-NP

Figure 22: I

P vs TA for LES 15-NP

Figure 23: I

P vs TA for LES 25-NP

Figure 24: I

P vs TA for LES 50-NP

Figure 25: Maximum RMS AC primary current / maximum DC primary current vs frequency

10

100

1k

10k

100k

1M

0

0.33

0.66

1

1.33

fc (Hz)

Ip AC derating

0

20

40

60

80

100

120

140

0

5

10

15

20

25

30

35

40

TA (°C)

0

20

40

60

80

100

120

140

0

10

20

30

40

50

60

70

80

90

100

TA (°C)

0

20

40

60

80

100

120

140

0

10

20

30

40

50

60

70

80

90

100

TA (°C)

0

20

40

60

80

100

120

140

0

20

40

60

80

100

120

140

160

TA (°C)