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參數(shù)資料
| 型號： | PBL38773/1ML |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TELECOM-SLIC, PQCC32 |
| 封裝： | PLASTIC, VQFN-32 |
| 文件頁數(shù)： | 57/64頁 |
| 文件大小： | 1052K |
| 代理商： | PBL38773/1ML |
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Ringing FlexiSLIC
PBL 38773/1
Overtemperature and Overvoltage Protection
Data Sheet
60
DS1, 2003-06-18
12
Overtemperature and Overvoltage Protection
12.1
Analog Temperature Guard
The varying environmental conditions in which SLICs operate in conjunction with fault
conditions may lead to the chip maximum temperature limitation being exceeded. The
SLIC reduces the DC line current and the longitudinal current when the chip temperature
reaches approximately 155
° C and increases the line current again automatically when
the chip temperature drops. Due to the linear nature of the chip temperature regulation
(e.g. DC loop current partially reduced) a talk path may still be functional while the
temperature guard is active. The detector output, DET, is forced to a logic low level while
the temperature guard is active.
12.2
Overvoltage Protection - General
The SLIC must be protected against foreign voltages on the telephone line.
Overvoltages can result from lightning, AC power contact, induction and other causes.
Refer to Table 3, TIPX and RINGX terminals, for maximum continuous and transient
voltages that the SLIC TIPX and RINGX terminals can withstand. Overvoltage protection
consists of primary protection located outside of the line card (e.g. gas tubes in a main
distribution frame) and secondary protection (series line resistors and solid state
clamping devices such as diodes and thyristors) located on the linecard printed circuit
board.
12.3
Secondary Protection
The circuit shown in Figure 8 utilizes series resistors (
R
F1, RF2) together with a
programmable overvoltage protector (OVP, e.g. Power Innovations TISP PBL3 or
TISP6NTP2AD) as secondary protection.
The TISP PBL3 is a dual forward-conducting buffered p-gate overvoltage protector. The
protector gate references the protection (clamping) voltage to the negative supply
voltage (i.e. the battery voltage,
V
BAT). 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,
C
GG, is needed to carry enough charge to supply a high
enough current to quickly turn on the thyristor in the protector.
C
GG should be placed
close to the overvoltage protection device. Without the capacitor even the low
inductance in the track to the
V
BAT supply will limit the current and delay the activation of
the thyristor clamp.
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