LCP1531 [STMICROELECTRONICS]
Programmable transient voltage suppressor for SLIC protection;
| 型号： | LCP1531 |
| 厂家： | 
ST |
| 描述： | Programmable transient voltage suppressor for SLIC protection |
| 文件： | 总10页 (文件大小：153K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LCP1531
Programmable transient voltage suppressor for SLIC protection
Datasheet - production data
Features
•
•
Dual programmable transient suppressor
Wide negative firing voltage range:
V
Gn = -175 V max.
•
Low dynamic switching voltages:
VFP and VDGL
SO-8
•
•
•
•
Low gate triggering current: IGT = 5 mA max
Peak pulse current: IPP = 37.5 A (5/310 µs)
Holding current: IH = 150 mA min.
Figure 1. LCP1531 functional diagram
Low space consuming package
TIP
Gn
1
TIP
Benefits
•
•
•
A Trisil™ is not subject to ageing and provides
a fail-safe mode in short circuit for better
protection.
GND
GND
RING
NC
Trisils are used to help equipment to meet
various standards such as YDT695, GR-1089
and ITU-T K20/21.
RING
Trisils are UL94 V0 resin approved and are
UL497B approved [file: E136224]).
Description
These devices are ideally suited to meet the
protection requirement of VoIP SLICs located in
next generation residential gateways. They can
be used for protecting any ringing SLIC since they
meet the protection standard requirements.
Positive overvoltages are clamped by 2 diodes.
Negative surges are suppressed by 2 thyristors,
their breakdown voltage being referenced to -VBAT
through the gate.
These components present a very low gate
triggering current (IGT) to reduce the current
consumption on printed circuit board during the
firing phase.
TM: Trisil is a trademark of STMicroelectronics
August 2013
DocID13397 Rev 5
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This is information on a product in full production.
www.st.com
Characteristics
LCP1531
1
Characteristics
Table 1. Standards compliance
Peak
surge
voltage
Required
peak
current
Minimum serial
resistor to meet
standard (Ω)
Voltage
waveform
Current
waveform
Standard
(V)
(A)
2500
1000
2/10 µs
500
100
2/10 µs
20
30
GR-1089 Core First level
10/1000 µs
10/1000 µs
GR-1089 Core
Second level
5000
1500
2/10 µs
2/10 µs
500
100
2/10 µs
40
0
GR-1089 Core
Intra-building
2/10 µs
6000
1500
150
120
0
ITU-T-K20/K21
ITU-T-K20 (IEC 61000-4-2)
IEC 61000-4-5
10/700 µs
1/60 ns
5/310 µs
37.5
8000
ESD contact discharge
ESD air discharge
0
0
15000
4000
4000
10/700 µs
1.2/50 µs
100
100
5/310 µs
8/20 µs
67
22
TIA-968-A,
1500
800
10/160 µs
10/560 µs
200
100
10/160 µs
10/560 µs
26
17
lightning surge type A
TIA-968-A,
1500
9/720 µs
37.5
5/320 µs
0
lightning surge type B
Table 2. Thermal resistance
Parameter
Symbol
Value
120
Unit
R
Junction to ambient
°C/W
th(j-a)
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LCP1531
Characteristics
Table 3. Absolute ratings (T
= 25 °C, unless otherwise specified)
amb
Symbol
Parameter
Value
Unit
10/1000 µs
8/20 µs
25
65
10/560 µs
5/310 µs
10/160 µs
1/20 µs
32
I
Peak pulse current
37.5
45
A
PP
60
2/10 µs
100
t = 20 ms
t = 200 ms
t = 1 s
16
9
Non-repetitive surge peak on-state current
(50 Hz sinusoidal)
I
A
TSM
6
I
Maximum gate current (50 Hz sinusoidal)
Negative battery voltage range
t = 10 ms
2
A
V
GSM
V
-175
Gn
T
Storage temperature range
-55 to +150
-40 to +150
stg
°C
°C
T
Operating junction temperature range
j
T
Maximum lead temperature for soldering during 10 s.
260
L
Figure 2. Electrical characteristics (definitions)
I
Symbol
Parameter
IGT
=
=
=
=
=
=
=
=
=
=
=
=
Gate triggering current
Peak forward voltage LINE / GND
Gate triggering voltage
Forward drop voltage LINE /GND
Reverse leakage current GATE / LINE
Holding current
Reverse voltage GATE / LINE
Dynamic switching voltage GATE / LINE
Peak pulse current
Breakdown current
Forward drop voltage LINE / GND
Capacitance LINE /GND
VFP
VGT
VF
IRG
IH
VRG
VDGL
IPP
IR
V
R
V
F
V
I
R
I
H
VF
C
I
PP
Figure 3. Pulse waveform
% I
PP
Pulse waveform
10/1000 µs:
tr = 10 µs
100
tp = 1000 µs
50
0
t
t
r
p
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10
Characteristics
LCP1531
Unit
Table 4. Parameters related to the diode LINE / GND (T
Test conditions
= 25 °C)
Max.
amb
Symbol
V
I = 5 A
t = 500 µs
3
5
V
V
F
F
V
10/700 µs
V
= 1.5 kV
R = 15 Ω
FP
PP
S
Table 5. Parameters related to the protection thyristors (T
= 25 °C)
Max.
amb
Symbol
Test conditions
Min.
Unit
I
V
V
V
V
= -48 V
LINE
0.1
5
5
7
mA
mA
µA
GT
I
= -48 V
= -75 V
150
H
Gn
RG
Gn
I
RG
(1)
= -48 V
V
DGL
10/700 µs
V
= 1.5 kV R = 15 Ω
I = 27.5 A
PP
V
PP
S
1. The oscillations with a time duration lower than 50 ns are not taken into account.
Table 6. Parameters related to diode and protection thyristors (T
= 25 °C,)
amb
Symbol
Test conditions
= -75 V
Typ.
Max.
Unit
I
V
= -1 V
V
T = 25 °C
5
µA
R
Gn / LINE
RM
j
V
V
= -50 V, V
= -2 V, V
= 1 V, F = 1 MHz
= 1 V, F = 1 MHz
15
35
LINE
LINE
RMS
RMS
C
pF
Table 7. Recommended gate capacitance
Symbol
Component
Gate decoupling capacitance
Min.
Typ.
Max.
Unit
C
100
220
nF
G
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LCP1531
Technical information
2
Technical information
Figure 4. LCP1531 concept behavior
Rs1
L 1
TIP
V Tip
ID1
IG
T1
Th1
D1
Gn
-Vbat
GND
GND
L 2
C
Rs2
VRing
RING
Figure 4. shows the classical protection circuit using the LCP1531 crowbar concept. This
topology has been developed to protect the new high voltage SLICs. It allows to program
the negative firing threshold while the positive clamping value is fixed at GND.
When a negative surge occurs on one wire (L1 for example) a current IG flows through the
base of the transistor T1 and then injects a current in the gate of the thyristor Th1. Th1 fires
and all the surge current flows through the ground. After the surge when the current flowing
through Th1 becomes less negative than the holding current I , then Th1 switches off.
H
When a positive surge occurs on one wire (L1 for example) the diode D1 conducts and the
surge current flows through the ground.
Figure 5. Example of PCB layout based on LCP1531 protection
LCP1531
GND
To
To
SLIC side
line side
Figure 5. shows the classical PCB layout used to optimize line protection.
The capacitor C is used to speed up the crowbar structure firing during the fast surge edges.
This allows minimization of the dynamic breakover voltage at the SLIC Tip and Ring inputs
during fast strikes. Note that this capacitor is generally present around the SLIC - V pin.
bat
So to be efficient it has to be as close as possible from the LCP1531 Gate pin and from the
reference ground track (or plan) (see Figure 5.). The optimized value for C is 100 nF.
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Technical information
LCP1531
The series resistors Rs1 and Rs2 designed in Figure 4. represent the fuse resistors or the
PTC which are mandatory to withstand the power contact or the power induction tests
imposed by the various country standards. Taking into account this fact the actual lightning
surge current flowing through the LCP1531 is equal to:
I
= V
/ (R + R )
surge g s
surge
With:
V
= peak surge voltage imposed by the standard.
surge
Rg = series resistor of the surge generator
Rs = series resistor of the line card (e.g. PTC)
The LCP1531 is particularly optimized for the new telecom applications such as the fiber in
the loop, the WLL, the remote central office. In this case, the operating voltages are smaller
than in the classical system. This makes the high voltage SLICs particularly suitable.
The schematics of Figure 6. gives the most frequent topology used for these applications.
Figure 6. Protection of high voltage SLIC
-Vbat
Rs (*)
TIP
Gn
TIP
GND
GND
100 nF
GND
SLIC
Line
RING
Rs (*)
RING
LCP1531
Line card
Rs (*) = PTC or fuse resistor
Figure 7. Surge peak current versus
overload duration
Figure 8. Relative variation of holding current
versus junction temperature
I [T ] / I [T =25°C]
H
j
H
j
I
(A)
TSM
1.3
1.2
1.1
1
24
20
16
12
8
F=50Hz
Tj initial=25°C
0.9
0.8
0.7
4
T (°C)
j
t(s)
0
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
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LCP1531
Package information
3
Package information
•
•
Epoxy meets UL94, V0
Lead-free packages
In order to meet environmental requirements, ST offers these devices in different grades of
®
®
ECOPACK packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
®
ECOPACK is an ST trademark.
Figure 9. SO-8 dimension definitions
L
c1
C
a3
A
a2
b
1
a
1
e
b
E
e3
D
M
5
8
F
1
4
Projection
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10
Package information
LCP1531
Table 8. SO-8 dimension values
Dimensions
Ref.
Millimeters
Typ.
Inches
Typ.
Min.
Max.
Min.
Max.
A
A1
A2
b
1.75
0.25
0.069
0.010
0.1
0.004
0.049
0.011
0.007
0.189
0.228
0.150
1.25
0.28
0.17
4.80
5.80
3.80
0.48
0.23
5.00
6.20
4.00
0.019
0.009
0.197
0.244
0.157
C
D
4.90
6.00
3.90
1.27
0.193
0.236
0.154
0.050
E
E1
e
h
0.25
0.40
0.50
1.27
0.010
0.016
0.020
0.050
L
L1
k°
ccc
1.04
0.041
0
8
0
8
0.10
0.004
Figure 10. SO-8 footprint measurements in mm (inches)
6.8
(0.268)
0.6
(0.024)
4.2
(0.165)
1.27
(0.050)
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LCP1531
Ordering information
4
Ordering information
Table 9. Ordering information
Order code
Marking
Package
Weight
Base qty
2500
Delivery mode
LCP1531RL
CP153
SO-8
0.08 g
Tape and reel
5
Revision history
Table 10. Document revision history
Revision Changes
Date
23-Mar-2007
1
2
First issue.
Reformatted for current standards. Changed gate capacitance
from 220 nF to 100 nF.
10-Apr-2008
10-Aug-2011
23-Feb-2012
27-Aug-2013
3
4
5
Updated standards in Table 1.
Standardized nomenclature for Gn.
Updated Table 1, Table 3, Figure 9 and Figure 10.
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LCP1531
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