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RD7

TOPSwitch-II® PC Standby Reference Design Board 90 to 375 VDC Input, 3.5 W Output

Power Integrations, Inc 

RD7

TRIPLE INSULATED SECONDARY TRANSFORMER (TRD1)

1

116 T

#37 AWG

2

3

14 T

#37 AWG

4

9, 10

6T

#26 AWG

Triple-insulated

6, 7

CORE# - PC40 EE16-Z (TDK)

GAP FOR AL OF 182 nH/T2

BOBBIN# - YW-193 (Yih Hwa Enterprises)

PIN

1

2

3

4

6, 7

9, 10

FUNCTION

HIGH-VOLTAGE DC BUS

TOPSwitch DRAIN

PRIMARY-SIDE COMMON

VBIAS

SECONDARY RETURN

OUTPUT

4

5

1

10

ELECTRICAL SPECIFICATIONS

Electrical Strength

60 Hz, 1 minute,

from pins 1-4 to pins 5-10

Creepage

Between pins 1-4 and pins 5-10

3000 VAC

6.00 mm (min)

Primary Inductance

All windings open

2430 µH –10%

Resonant Frequency

All windings open

500 kHz (min)

Primary Leakage Inductance Between pins 1-2 (pins 6-10 shorted)

NOTE: All inductance measurements should be made at 100 kHz

63 µH (max)

Figure 13. Electrical Specification of Transformer TRD7.

PI-2273-070298

7 B

4/99

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