c1023-a Coilcraft, Inc., c1023-a Datasheet

c1023-a

Manufacturer Part Number

c1023-a

Description

Poe Transformerfor National Semiconductorlm5070 Poe Interface

Manufacturer

Coilcraft, Inc.

Datasheet

1.C1023-A.pdf (1 pages)

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C1023-AL_

0.450

11,43

1. When ordering, please specify a packaging code:

2. Inductance is for the primary, measured at 10 kHz, 0.1 Vrms, 0 Adc.

0.810

20,57

number

Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic

Dot indicates pin 1

0.080

Part

2,03

max

±10% (µH) ±10% (µH)

B = Less than full reel. In tape, but not machine ready. To

L at 0 A

110

tape (175 per full reel).

have a leader and trailer added ($25 charge), use

code letter D instead.

1.181

30,00

0.969

24,60

0.827

21,00

max

C1023-ALD

L at Ipk

99.0

PoE Transformer

0.028

0,711

0.139 0.656

0.118

pri

0.004 /0,10

3,0

DCR max (Ohms)

aux

0.130

Specifications subject to change without notice.

Please check our website for latest information.

3,30

Weight:

Terminations:

Tape and reel:

0.016

sec

Recommended

Land Pattern

Leakage

L (µH)

0.930

23,62

1.40

This surface mount flyback transformer was developed

specifically for the National Semiconductor LM5070

Powered Devices Interface in 13 Watt Power over

Ethernet (PoE) applications.

It is designed to operate at frequencies up to 1 MHz

with an with an input voltage of 36 – 72 Volts. Output

with the secondary windings connected in parallel is

3.3 V, 4.5 A. Isolation is 1500 Vrms from the primary

and auxiliary windings to the secondary.

Coilcraft can design custom transformers with volt-

age, inductance and DCR values to meet your specific

requirements.

For free evaluation samples, contact Coilcraft or order

them on-line at www.coilcraft.com.

10. Electrical specifications at 25°C.

12.4 g

Tin-silver over tin over nickel over phos bronze

175/13″ reel, 44 mm tape width

3. Ipk is the peak current drawn at minimum input voltage.

4. DCR for the secondary is per winding.

5. Leakage inductance is for the primary winding with all other pins

6. Turns ratio is with the secondary windings connected in parallel.

7. Capacitance measured between pins 3 and 4 with other pins shorted.

8. Isolation is measured from the primary and aux to the secondary.

9. Operating temperature range –40°C to +85°C.

shorted.

pri : sec pri : aux

1 : 0.19 1 : 0.69

Turns ratio

0.050

1,27

0.118

3,0

For National Semiconductor

LM5070 PoE Interface

Capacitance

Document 423 Revised 10/25/06

Secondary windings to be connected

in parallel on PC board.

Pri

Aux

(pF)

Document 423

Ipk

(A)

1.5

Isolation

(Vrms)

1500

Sec

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