PBL38650/2QNS Infineon Technologies, PBL38650/2QNS Datasheet - Page 44

• Manufacturer Part Number: PBL38650/2QNS
• Description: IC LINE INTERFACE SLIC PLCC-28
• Manufacturer: Infineon Technologies
• Series: FlexiSLIC™r

Specifications of PBL38650/2QNS

• Function: Subscriber Line Interface Concept (SLIC)
• Number Of Circuits: 1
• Voltage - Supply: 5V
• Current - Supply: 2.8mA
• Power (watts): 730mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-PLCC
• Includes: Current Feeding, Ground Key Detector, Ring Relay Driver
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Interface: -
• Other names: SP000007904

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,
such that no interference is injected into the receive summing node (RSN). Ground plane
surrounding the RSN pin is advisable.
Analog Ground (AGND) should be connected to Battery Ground (BGND) on the PCB, in
one point. The capacitors for the battery should be connected with short wide leads of
the same length.
Data Sheet
Table
Secondary Protection
Power-Up Sequence
Printed Circuit Board Layout
3, TIPX and RINGX terminals, for maximum continuous and transient
R
F
Figure 9
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
44
R
F1
,
C
Power-Up Sequence
R
GG
F2
Rev. 2.0, 2005-04-14
) together with a
should be placed
PBL 38650/2
FlexiSLIC