- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383255 > LCDP1521RL (意法半導體) DUAL LINE PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION PDF資料下載
參數(shù)資料
| 型號： | LCDP1521RL |
| 廠商： | 意法半導體 |
| 英文描述： | DUAL LINE PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION |
| 中文描述： | 雙在線可編程瞬態(tài)電壓抑制器保護的用戶接口 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 94K |
| 代理商： | LCDP1521RL |
LCDP1521
6/8
TECHNICAL INFORMATION
V
Ring
GND
Gate
TIP
RING
GND
-Vbat
C
Rs1
Rs2
L 1
L 2
VTip
Th1
D1
T1
IG
ID1
Fig. A1:
LCDP1521 concept behavior.
Figure A1 shows the classical protection circuit using the LCDP1521 crowbar concept. This topol-
ogy 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
H
, then Th1 switches off.
When a positive surge occurs on one wire (L1 for example), the diode D1 conducts and the surge current
flows through the ground.
The capacitor C is used to speed up the crowbar structure firing during the fast surge edges.
This allows to minimize the dynamical breakover voltage at the SLIC Tip and Ring inputs during fast
strikes. Note that this capacitor is generally present around the SLIC - Vbat pin.
So to be efficient it has to be as close as possible from the LCDP1521 Gate pin and from the reference
ground track (or plan). The optimized value for C is 220nF.
The series resitors Rs1 and Rs2 designed in figure A1 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 LCDP is
equal to:
I surge = V surge / (Rg + Rs)
With
V surge = peak surge voltage imposed by the standard.
Rg = series resistor of the surge generator
Rs = series resistor of the line card (equivalent to PTC + R on Fig. A2)
e.g. For a line card with 60
of series resistors which has to be qualified under GR1089 Core 1000V
10/1000
μ
s surge, the actual current through the LCDP1521 is equal to:
I surge = 1000 / (10 + 60) =
14A
The LCDP1521 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 A2 gives the
most frequent topology used for these applications.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LCP150S | PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION |
| LCP1511 | PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION |
| LCP1511D | PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION |
| LCP1521 | PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR FOR SLIC PROTECTION |
| LCP152 | Programmable transient voltage suppressor for SLIC protection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LCDP1521SRL | 功能描述:TVS二極管陣列 Dual Line 5mA 40A Prog Suppressor RoHS:否 制造商:Littelfuse 極性: 通道:4 Channels 擊穿電壓: 鉗位電壓:11.5 V 工作電壓:2.5 V 峰值浪涌電流:20 A 安裝風格:SMD/SMT 端接類型:SMD/SMT 系列: 最小工作溫度:- 40 C 最大工作溫度:+ 85 C |
| LCDPMT | 制造商:Pulse 功能描述:Pole Mount VESA 400X200 |
| LCDPMT-TA | 制造商:Pulse 功能描述:Bracket Pole Mount Double Arm |
| LCDPXBEIGE | 制造商:FibreFab 功能描述: |
| LCDPXBLUE | 制造商:FibreFab 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。