PBL38630/2SOTNT Infineon Technologies, PBL38630/2SOTNT Datasheet - Page 43

• Manufacturer Part Number: PBL38630/2SOTNT
• Manufacturer: Infineon Technologies

Specifications of PBL38630/2SOTNT

• Number Of Channels: 1
• On-hook Transmission: Yes
• Polarity Reversal: Yes
• On-chip Ring Relay Driver: Yes
• Operating Supply Voltage (typ): 5V
• Operating Temp Range: -40C to 85C
• Loop Current Limit: 45mA
• Operating Temperature Classification: Industrial
• Pin Count: 24
• Mounting: Surface Mount
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (min): 4.75V
• Lead Free Status / RoHS Status: Not Compliant

10
10.1
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
voltages that may be applied to the SLIC.
10.2
The circuit shown in
programmable overvoltage protector (OVP, for example Bournes TISP PBL2) as
secondary protection.
The TISP PBL2 is a dual forward-conducting buffered p-gate overvoltage protector. The
protector gate references the protection (clamping) voltage to the negative supply
voltage (that is the battery voltage,
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,
enough current to quickly turn on the thyristor in the protector.
close to the overvoltage protection device. Without the capacitor even the low
inductance in the track to the
the thyristor clamp.
The fuse resistors
dissipators when transients are clamped, and of being fuses when the line is exposed to
a power cross. If a PTC is choosen for
in series with resistors not sensitive to temperature, as the PTC will act as a capacitance
for fast transients and therefore will not protect the SLIC.
11
No special power-up sequence is necessary, except that ground has to be present
before all other power supply voltages.
12
Care in Printed Circuit Board (PCB) layout is essential for proper function. The
components connected to the RSN input should be placed in close proximity to that pin,
Data Sheet
Table
Overvoltage Protection
Overvoltage Protection - General
Secondary Protection
Power-Up Sequence
Printed Circuit Board Layout
3, TIPX and RINGX terminals, for maximum continuous and transient
R
F
Figure 8
serve the dual purposes of being non-destructive energy
C
V
B
GG
supply will limit the current and delay the activation of
utilizes series resistors (
, is needed to carry enough charge to supply a high
V
B
). As the protection voltage will track the negative
R
F
, note that it is important to always use PTC’s
43
R
F1
Overvoltage Protection
,
C
R
GG
F2
Rev. 2.0, 2005-04-14
) together with a
should be placed
PBL 38630/2
FlexiSLIC