PBL 386 40/2
protector will crowbar into a low voltage
on-state condition, by firing an internal
thyristor.
Power-up Sequence
The fuse resistors RF serve the dual
purposes of being non-destructive
energy dissipators, when transients are
clamped and of being fuses, when the
line is exposed to a power cross.
If a PTC is chosen for RF, note that it is
important to always use the PTC´s 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 TISP.
No special power-up sequence is
necessary except that ground has to be
present before all power supply voltages.
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 shall
be placed close to the overvoltage
protection device. Without the capacitor
even the low inductance in the track to
the VBat supply will limit the current and
delay the activation of the thyristor
clamp.
Printed Circuit Board Layout
Care in PCB layout is essential for
proper function. The components
connecting to the RSN input should be
placed in close proximity to that pin, so
that no interference is injected into the
RSN pin. Ground plane surrounding the
RSN pin is advisable.
The two ground pins AGND and BGND
should be connected together on the
PCB at the device location.
The capacitors for the battery should
be connected with short wide leads of the
same length.
Ordering Information
Package
Temp. Range
Part No.
PBL 386 40/2SHT
PBL 386 40/2SOS
PBL 386 40/2SOT
24 pin SSOP Tape & Reel -40° - +85° C
24 pin SOIC Tube
24 pin SOIC Tape & Reel
28 pin PLCC Tube
-40° - +85° C
-40° - +85° C
-40° - +85° C PBL 386 40/2QNS
28 pin PLCC Tape & Reel -40° - +85° C
PBL 386 40/2QNT
Information given in this data sheet is believed to be
accurate and reliable. However no responsibility is
assumed for the consequences of its use nor for any
infringement of patents or other rights of third parties
which may result from its use. No license is granted
by implication or otherwise under any patent or patent
rights of Ericsson Microelectronics AB. These
products are sold only according to Ericsson
Microelectronics AB' general conditions of sale,
unless otherwise confirmed in writing.
Specifications subject to change without
notice.
1522-PBL 386 40/2 Uen Rev. B
© Ericsson Microelectronics AB 2000
This product is an original Ericsson
product protected by US, Europe and
other patents.
Ericsson Microelectronics AB
SE-164 81 Kista-Stockholm, Sweden
Telephone: +46 8 757 50 00
16
ERICSSON [ ERICSSON ]
