Base/Gate Driver Transformers

Document 130 -1

Document 130-1 Revised 04/20/12

• Lower cost than toroidal equivalents

• Frequency range of 10 – 250 kHz and up

• Industry standard pin centers

• 3750 Vrms, one minute isolation (hipot) between

primary and secondary windings; 1500 Vrms, one

minute between secondaries

• UL1446 Class B (130°C) Insulation System

(UL File E83628)

Coilcraft

Designer’s Kit No. P404 contains samples of four

standard driver transformers.To order, contact Coilcraft or

visit

http://order.coilcraft.com to purchase on-line.

SD250-1L

SD250-2L

SD250-3L

SD250-4L

Turns ratio ±3% (pri:sec)

1 : 1

1 : 1.5

1 : 1 : 1

1 : 1.5 : 1.5

Primary winding

1.5 mH

1.5 mH

1.5 mH

1.5 mH

4.0 µH

4.0 µH

4.0 µH

4.0 µH

DCR

0.4

0.4

0.4

0.4

Volt-time product

375 V-µsec

375 V-µsec

375 V-µsec

375 V-µsec

Secondary winding(s)

Capacitance, pri to sec (max)

50 pF

50 pF

50 pF

50 pF

DCR, each section (max)

0.75

2.5

0.75

2.5

1. Measured at 1 Vrms, 15.75 kHz.

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

3. Electrical specifications at 25°C.

5

6

10

1

Pri

(drive)

Pri

(drive)

5

1

Sec

9

10

Sec 2

6

7

Sec 1

SD250-1 and 250-2

SD250-3 and 250-4

0.044

1,12

0.15 ±0.030

3,81 ±0,762

0.032

0,813

0.950

24,13

max

dia ref

dia

Pins 7 and 9 are not present

on SD250-1 and SD250-2

0.62 ±0.015

15,75 ±0,38

0.75

19,05

Recommended

board layout

0.20

5,08

0.40

10,16

0.80

20,32

1

5

67

910

1.10

27,94

0.395

10,03

1.10

27,94

max

max

Notch

indicates

pin 1

max

15

6

7

9

10

Weight:

15.6 – 16.8 g

Termination: Tin-silver over tin over copper

Packaging:

49 per tray