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PBL38650-2

Subscriber Line Interface Circuit

Ericsson  

PBL 386 50/2

The TISPPBL2 is a dual forward-

conducting buffered p-gate overvoltage

protector. The protector gate references

the protection (clamping) voltage to

negative supply voltage (i e the battery

voltage, VB ). As the protection voltage

will track the negative supply voltage the

overvoltage stress on the SLIC is

minimized.

Positive overvoltages are clamped to

ground by a diode. Negative

overvoltages are initially clamped close

to the SLIC negative supply rail voltage

and the protector will crowbar into a low

voltage on-state condition, by firing an

internal thyristor.

A gate decoupling capacitor, CGG, is

needed to carry enough charge to supply

a high enough current to quickly turn on

the thyristor in the protector. CGG shall be

placed close to the overvoltage

protection device. Without the capacitor

even the low inductance in the track to

the VBat supply will limit the current and

delay the activation of the thyristor

clamp.

The fuse resistors RF serve the dual

purposes of being non- destructive

energy dissipators, when transients are

clamped and of being fuses, when the

line is exposed to a power cross.

If a PTC is choosen for RF, note that it

is important to always use PTC´s in

series with resistors not sensitive to

temperature, as the PTC will act as a

capacitance for fast transients and

therefore will not protect the SLIC.

Power-up Sequence

No special power-up sequence is

necessary except that ground has to be

present before all power supply voltages.

Printed Circuit Board Layout

Care in PCB layout is essential for

proper function. The components

connecting to the RSN input should be

placed in close proximity to that pin, so

that no interference is injected into the

RSN pin. Ground plane surrounding the

RSN pin is advisable.

Analog ground (AGND) should be

connected to battery ground (BGND) on

the PCB in one point.

The capacitors for the battery should

be connected with short wide leads of the

same length.

Ordering Information

Package

Temp. Range

24 pin SSOP Tape & Reel 0° - +70° C

24 pin SOIC Tube

0° - +70° C

24 pin SOIC Tape & Reel 0° - +70° C

28 pin PLCC Tube

0° - +70° C

28 pin PLCC Tape & Reel 0° - +70° C

Part No.

PBL 386 50/2SHT

PBL 386 50/2SOS

PBL 386 50/2SOT

PBL 386 50/2QNS

PBL 386 50/2QNT

Information given in this data sheet is believed to be

accurate and reliable. However no responsibility is

assumed for the consequences of its use nor for any

infringement of patents or other rights of third parties

which may result from its use. No license is granted

by implication or otherwise under any patent or

patent rights of Ericsson Microelectronics. These

products are sold only according to Ericsson

Microelectronics' general conditions of sale, unless

otherwise confirmed in writing.

Specifications subject to change without

notice.

1522-PBL 386 50/2 Uen Rev. A

© Ericsson Microelectronics AB 1999

This product is an original Ericsson

product protected by US, European and

other patents.

Ericsson Microelectronics AB

SE-164 81 Kista-Stockholm, Sweden

Telephone: +46 8 757 50 00

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