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參數(shù)資料
| 型號： | PBL38773/1SO |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TELECOM-SLIC, PDSO28 |
| 封裝： | PLASTIC, SOIC-28 |
| 文件頁數(shù)： | 37/64頁 |
| 文件大?。?/td> | 1052K |
| 代理商： | PBL38773/1SO |
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Ringing FlexiSLIC
PBL 38773/1
Ringing Voltage
Data Sheet
42
DS1, 2003-06-18
7
Ringing Voltage
When designing PBL 38773/1 the object was to design a robust ringing SLIC that
supports balanced ringing and that handles the high power dissipation and the different
fault conditions that may occur when ringing. For power handling see Chapter 8.1.
Figure 13 shows a high level schematic of the ring loop.
The ring loop in the PBL 38773/1 is designed as a voltage amplifier. An internal feedback
loop from the two-wire to the input sets a predetermined voltage gain. The voltage gain
is adjusted to 94 by the AGC-R when ringing. The power amplifiers are of the current
feed type that makes it possible to provide a reliable control of the ringing current. This
arrangement makes it possible to add a control device, including an Automatic Gain
Control unit, that provides protecting functions, such as:
Automatic Gain Control-Ringing, AGC-R: If the amplifiers that supply TIPX and
RINGX are forced to saturation due to i.e. variations of the
V
BAT voltage or the VR
input signal level, the AGC-R will decrease the output signal. The shape of the output
signal is kept undistorted. This function guarantees a low output impedance,
approximately 2
× 20 , and also allows variations in the input signal and the V
BAT
voltage.
Current limit: At off-hook or in fault conditions, i.e. TIPX and RINGX are shorted, the
control device will limit the ringing current to approximately 10 mA above the
programmed ring-trip threshold.
Foreign voltage protection: The control device will detect if TIPX and/or RINGX are
shorted to e.g. ground. The output voltage will be shut off to keep the power down.
The detector output will be high.
Temperature management: If the chip temperature exceeds 155
° C the control
device will reduce the output voltage until the chip temperature equals 155
° C, and
increase it again when the temperature drops. The detector output, DET, is forced to
a logic low level when the temperature guard is active.
The VR pin is a high impedance input and has to have a resistor,
R
VR = 200 k,
connected to ground, and a capacitor,
C
VR = 470 nF, in series to decouple the DC
component. The voltage
V
R has a reference to AGND. The VR input handles any
waveform, e.g. sinusoidal, trapezoid or square-wave shaped signals, since the SLIC acts
like a linear amplifier. A DC-offset can be obtained by adding a DC part to the input
signal. The capacitor
C
RING forms a low pass filter that is an essential part of the control
device. The control device is used to control e.g. the applied output voltage, the ringing
current or the chip temperature. The resistor
R
RT is a programming resistor that sets the
ring-trip detector threshold. The current through the resistor is a rectified version of the
line current divided by a factor. The capacitor
C
RT filters the ring-trip detection device.
PRT-pin is connected to the negative input of an OP-amplifier. The positive input is
connected to a reference voltage. The output of the OP-amplifier is connected to the
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