Datasheet LCP02-150B1 Datasheet (SGS Thomson Microelectronics)

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LCP02-150B1

A.S.D.™

FEATURES

Protection IC recommended for ringing SLICs.

■

Wide firing voltage range: from -110V to +95V.

■

Low gate triggering current: IG= 5mA max.

■

Peak pulse current: IPP= 30A (10/1000µs) .

■

Holding current: IH= 150mA min.

■

UL497B approved (file E136224)

■

MAIN APPLICATIONS

Dual battery supply voltage SLICs

■

- negative battery supply configuration

-negative & positivebattery supply configuration

■ Central Office (CO)

■ Private Branch Exchange (PBX)

Digital Loop Carrier (DLC)

■

■ AsymmetricalDigital Subscriber Line(ADSL G.Lite)

■ Fiber in the Loop (FITL)

■ Wireless Local Loop (WLL)

■

Hybrid Fiber Coax (HFC)

■

ISDN Terminal Adapter

■

Cable modem

PROTECTION IC

FOR RINGING SLICS

SO-8 WIDE

FUNCTIONAL DIAGRAM

TIP

GND

DESCRIPTION

The LCP02-150B1 has been developed to protect SLICsoperatingonboth negativeand positivebattery supplies, as well as on high voltage SLICs. It providescrowbar modeprotection for bothTIP and RINGlines. Thesurge suppression isassumed for each wire by two thyristor structures, one dedicated to positive surges the second one for negative surges. Both positive and negative threshold levels are programmable by two gates (Gn and Gp). The use of transistors decreases the battery currents during surge suppression. The LCP02-150B1 has high Bellcore Core, ITU-T and FCC Part 68 lightning surge ratings, ensuring rugged performance in the field. In addition, it is also specified to assist a designer to comply with UL1950, IEC950 and CSA C22.2. It is UL 497B approved (file E136224), and has UL94-V0resin approved

TM: ASD is trademarks of STMicroelectronics.

September 2000 - Ed: 4A

RING

PIN-OUT CONFIGURATION

TIP

RING

NC GND GND NC

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LCP02-150B1

COMPLIES WITH FOLLOWING STANDARDS

ITU-T K20

ITU-T K21

VDE0433 VDE0878

IEC61000-4-5

FCC Part 68

lightning surge type A

FCC Part 68

lightning surge type B

BELLCORE

GR-1089-CORE

First level

BELLCORE

GR-1089-CORE

Second level

BELLCORE

GR-1089-CORE

Intrabuilding

Peak surge

voltage

(V)

4000 1000

4000 1500

Voltage

waveform

(µs)

10/700 10/700

Required

peak current

(A)

100

37.5

Current

waveform

(µs)

5/310 5/310

Minimum serial

resistor to meet

2000 10/700 50 5/310 5 2000 1.2/50 50 1/20 0

level 3 level 4

1500

800

10/700

1.2/50

10/160 10/560

100 200

100

5/310

8/20

10/160 10/560

1000 9/720 25 5/320 0

2500 1000

2/10

10/1000

500 100

2/10

10/1000

5000 2/10 500 2/10 40

800

1500

2/10 2/10

100 100

2/10 2/10

standard (

25 20

20 25

0 0

)

ABSOLUTE MAXIMUM RATINGS (T

amb

=25°C)

Symbol Parameter Value Unit

TSM

Peak pulse current

Non repetitive surge peak on-state current (F = 50Hz)

max

∆ V

bat

stg

Note 1: Within the Top range, the LCP02-150B1 keeps on operating. The impacts of the ambient temperature are given by derating curves.

Maximum negative battery voltage range Maximum positive battery voltage range Total battery supply voltage

max

Operating temperature range (see note 1) Storage temperature range Lead solder temperature (10s duration)

10/1000µs

5/310µs

1/20µs

= 0.2 s

=1s

=15min

30 45 65

5.5

4.2

1.5

See fig.1 -110to 0

0to+95

190

-20 to +85 °C

-55to+150 °C 260 °C

100

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Fig. 1: Test circuit

TIP

LCP02-150B1

Gn from -110V to +0V

∆≤Vbat 190V

RING

Gn connected to negative supply voltage Gp connected to positive supply voltage

ba GpGn

V t: differential voltage betweenV and V∆

THERMAL RESISTANCE

Gp from +0V to +95V

TIP

G RING

NC GND GND

Symbol Parameter Value Unit

th (j-a)

Junction to ambient

150 °C/W

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LCP02-150B1

ELECTRICAL CHARACTERISTICS (T

amb

= 25°C)

1 - PARAMETERS RELATED TO THE NEGATIVE SUPPRESSOR

Symbol Parameter Test conditions Min. Max. Unit

H-

Negative gate trigger current

Holding current

Gn/GND

= -60V

Measured at 50Hz Go-No Go test, VGn= -60V 150

5mA

(see fig.2)

RGL-

Reverse leakage

Tj = 25°C, V

Gn/line

= -190V

5µA

current Gn/Line

DGL-

Dynamic switching voltage Gn / Line (see note 2)

Gn/GND

= -60V 10/1000µs 1kV R 10/700µs 2kV R

1.2/50µs 2kV R

=25ΩIPP= 30A

2 - PARAMETERS RELATED TO THE POSITIVE SUPPRESSOR

Symbol Parameter Test conditions Min. Max. Unit

RGL+

Positive gate trigger current

Reverse leakage

Gp/GND

= 60V

Measured at 50Hz Tj = 25°C, V

Gp/line

= +190V

5mA

5µA

current Gp/LINE

DGL+

Dynamic switching voltage Gp / Line (see note 2)

Gp/GND

= +60V 10/1000µs 1kV R 10/700µs 2kV R

1.2/50µs 2kV R

=25ΩIPP= 30A

3 - PARAMETERS RELATED TO LINE/GND

Symbol Parameter Test conditions Typ. Max. Unit

Reverse leakage current

off

Capacitance

Tj = 25°C, V Tj = 25°C, V

= +90V, V

LINE

= -105V, V

LINE

GP/LINE

GN/LINE

= +1V

= -1V

VR= -3V, F =1MHz, VGp= 60V, VGn= -60V

5 5

60 pF

LINE/GND

Note 2: The V

value is the difference between the peak line voltage during the surge and the programmed gate voltage.

DGL

µA

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LCP02-150B1

Fig. 2: Relative variation of holding current versus

junction temperature.

IH (T) / IH(25°C)

1.6

1.4

1.2

0.8

0.6

0.4

-20 0 20 40 60 80 100

T (°C)

Fig. 4: Capacitance versus reverse applied

voltage (typical values) with V

= +90V.

= -90V and

Fig. 3: Maximum non repetitive surge peak on state current versus overload duration (with 50Hz sinusoidal wave and initial junction temperature equal to +25°C).

I (A)

TSM

0.01 0.1 1 10 100 1000

t (s)

70 60 50 40 30 20 10

C (pF)

line +

line -

Vline (V)

20 40 60 80 100

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LCP02-150B1

TECHNICAL INFORMATION

Fig. 5: LCP02 concept behavior.

Rs1

L 1

GND

-Vbat

TIP

VTip

Ign Igp

Th1

Th2

+Vb

Rs2

RING

GND

L 2

V Ring

Figure 5 shows the classical protection circuit using the LCP02 crowbar concept. This topology has been developped to protect the new two-battery voltage SLICs. Itallows both positive and negative firing thresholds to be programmed. The LCP02-150B1 has two gates (Gn and Gp). Gn is biasedto negative battery voltage

-Vbat, while Gp is biased to the positive battery voltage +Vb. When a negative surge occurs on one wire (L1 for example), a current Ign flows through the base of the

transistor T1 and then injects a current in the gate of the thyristor Th1 which fires. All the surge current flows through the ground. After the surge, when the current flowing through Th1 becomes less negative than the negative holding current Ih-, Th1 switches off. This holding current I as per figure2.

When a positive surge occurs on one wire (L1 for example), a current Igp flows through the base of the transistor T2 and then injects a current in the gate of the thyristor Th2 which fires. All the surge current flows through the ground. After the surge, when the current flowing through Th2 becomes less positive than the positive holding current Ih+, Th2 switches off. This holding current I temperature dependant and the same figure 2 also applies.

The capacitors Cn and Cp are used to speed up the crowbar structure firing during the fast rise or fall edges.This allows tominimize thedynamicalbreakover voltageat the SLICTip and Ringinputs during fast surges. Please note that these capacitors are generally available around the SLIC. To be efficient they have to be as close as possible to the LCP02-150B1 gate pins (Gn and Gp) and to the reference ground track (or plan). The optimized value for Cn and Cp is 220nF.

The series resistors Rs1 and Rs2 designed in figure 5 represent the fuse resistors or the PTCs which are needed to withstand the power contact or the power induction tests imposed by the country standards. Taking this factor into account, the actual lightning surge current flowing through the LCP02-150B1 is equal to :

I surge = Vsurge / (Rg + Rs)

is temperature dependant

H-

, typically 20mA at 25°C, is

H+

With V surge = peak surge voltage imposed by the standard.

Rg = series resistor of the surge generator Rs = series resistor of the line card (e.g. PTC)

e.g.:

Fora line cardwith 50Ωof series resistorswhich hasto be qualifiedunder Bellcore 1000V10/1000µs

surge, the present current through the LCP02-150B1 is equal to :

I surge = 1000 / (10 + 50) = 17A

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LCP02-150B1

The LCP02-150B1 topology is particularly optimized for the new telecom applications such as fiber in the loop, WLL systems, decentralized central office for example. The schematics of figures 6 and 7 give the 2 most frequent topologies used for these emergent applications

Fig. 6: Protection of SLIC with positive and negative battery voltages.

Line card

-Vbat

Rs (*)

TIP

Line

GND

Rs (*)

Rs (*) = PTC or Resistor fuse

Fig. 7: Protection of high voltage SLIC

Line card

Rs (*)

GND

220nF

Line

Rs (*)

220nF

LCP02

TIP

LCP02

RING

TIP

RING

220nF

SLIC

RING

+Vb

-Vbat

TIP

SLIC

RING

Rs (*) = PTC or Resistor fuse

Figure 6 shows the classical protection topology for SLIC using both positive and negative battery voltages. With such a protection the SLIC is protected against surge over +Vb and lower than -Vbat. In this case, +Vb can be programmed up to +95V while -Vbat can be programmed down to -110V. Please note that the differential voltage does not exceed ∆V

max at 190V.

bat

Figure 7 gives the protection topology for the new SLIC using high negative voltage down to -110V.

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LCP02-150B1

PACKAGE MECHANICAL DATA

SO-8 Wide Plastic

ORDER CODE

REF.

DIMENSIONS

Millimetres Inches

Min. Typ. Max. Min. Typ. Max.

A 2.50 0.099

A1 0.25 0.010 A2 1.51 2.00 0.059 0.079

b 0.35 0.40 0.51 0.013 0.016 0.020 c 0.10 0.20 0.35 0.003 0.008 0.014

D 6.05 0.239 E 5.02 6.22 0.197 0.245

E1 7.62 8.89 0.30 0.35

e 1.27 0.05

K 10°

L 0.50 0.80 0.019 0.032

Ordering Type Marking Package Weight Base qty Delivery mode

LCP02-150B1 LCP02 SO-8-Wide 0.13g 90 Tube

LCP02-150B1RL 1500 Tape& Reel

Informationfurnished is believed to be accurateand reliable. However, STMicroelectronics assumes noresponsibility for the consequences of useof such information nor for any infringement of patents or other rights of third partieswhich may result from its use. No licenseis granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

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