AN728 データシートの表示（PDF） - Vishay Semiconductors

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Designing A Flyback Converter with Si9113 for Feeding the TE from U-Interface In ISDN

Vishay Semiconductors 

AN728

Vishay Siliconix

TE POWER STATES

Two states exist in which power is supplied to TE: normal and

restricted. The state determines the maximum power levels

supplied to TE by the power sources.

Under normal conditions, PS1 will deliver up to 1 W of power

to an activated terminal on the S-interface. The restricted

condition may be enforced under emergency conditions when

the network or NT is forced to supply power in the event of a

mains supply failure.

When supplying power via PS1, NT indicates this condition to

TE by reversing the voltage polarity. This causes the attached

TEs to enter a restricted mode of operation in which the

designated TE can consume only 380 mW of power to remain

operable. The power capabilities of PS1 and PS2 in normal

and restricted modes are given in Table 1.

TABLE 1 . POWER SOURCES SPECIFICATION

Condition

Power Source 1

ITU-T/ETSI, Nominal 40 V

Power Source 2

ITU-T/ETSI, Nominal 40 V

Voltage/Power at NT in Normal Mode

34 to 42 V at up to max. power (1 W)

Voltage/Power at NT in Restricted Mode

Voltage/Power at TE in Normal Mode

Voltage/Power at TE in Restricted Mode

34 to 42 V at up to 420 mW

24 to 42 V at up to 1 W

32 to 42 V at up to 401 mW. (380 mW for a designated

at TE plus 21 mW for all other TEs combined)

42-V max. Min defined by TE requirements.

Max. power 8 W(ETSI-7 W)

42-V max. Min defined by TE requirements.

Min. power 2 W

32 to 42 V at min. power of 7 W

32 to 42 V at min. power of 2 W

BIBLIOGRAPHY

1. Nick Burd, The ISDN subscriber loop; Chapman & Hall

2. Power Integrated Circuit; Vishay Siliconix

3. Switching Power Supply Design; Abraham Pressman

4. G Dicenet, Design and prospects for the ISDN; Artech House

5. ETS 300 012-1 Integrated Services Digital Network (ISDN), Basic User Network Interface (UNI) Part 1: Layer 1 specification;

ETSI

6. ETR 080 Transmission and Multiplexing (TM); Integrated Services Digital Network (ISDN) basic rate access; Digital

transmission system on metallic local lines; ETSI

www.vishay.com S FaxBack 408-970-5600

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Document Number: 71120

29-Feb-00

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