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R3612 Schematic ( PDF Datasheet ) - Power Innovations Limited

Teilenummer R3612
Beschreibung PROGRAMMABLE OVERVOLTAGE PROTECTOR FOR ERICSSON COMPONENTS 3357/3 DCLIC
Hersteller Power Innovations Limited
Logo Power Innovations Limited Logo 




Gesamt 16 Seiten
R3612 Datasheet, Funktion
Copyright © 1997, Power Innovations Limited, UK
R3612
PROGRAMMABLE OVERVOLTAGE PROTECTOR
FOR ERICSSON COMPONENTS 3357/3 DCLIC
DECEMBER 1995 - REVISED SEPTEMBER 1997
OVERVOLTAGE PROTECTION FOR ERICSSON COMPONENTS LINE INTERFACE CIRCUITS
q PBA 3357/3 DCLIC Overvoltage Protector
q Dual Voltage-Programmable Protector
- Wide 0 to -70 V Programming Range
- Low Voltage Overshoot Crowbar and Diode
- Low 5 mA max. Triggering Current
- Does not Charge Gate Supply
- Specified for 0°C to 70°C Operation
- Plastic Dual-in-line Package
q Rated for International Surge Wave Shapes
WAVE SHAPE
STANDARD
2/10 µs
0.5/700 µs
10/700 µs
10/1000 µs
TR-NWT-001089
RLM88
K17, K20, K21
TR-NWT-001089
ITSP
A
80
38
38
30
P PACKAGE
(TOP VIEW)
(Tip) K1
(Gate) G
1
2
8 K1 (Tip)
7 A (Ground)
NC 3
6 A (Ground)
(Ring) K2 4
5 K2 (Ring)
MD6XAV
NC - No internal connection
Terminal typical application names shown in
parenthesis
device symbol
K1 G K2
description
The R3612 is a dual forward-conducting buffered
p-gate over voltage protector in a plastic DIP
package. It is designed to protect the Ericsson
Components PBA 3357/3 DCLIC (Dual Channel
Complete Line Interface Circuit) against over
voltages on the telephone line caused by
lightning, a.c. power contact and induction. The
R3612 limits voltages that exceed the DCLIC
supply rail voltage.
The DCLIC line driver section is powered from
0 V (ground) and a negative voltage in the region
of -44 V to -56 V. The protector gate is connected
to this negative supply. This references the
protection (clipping) voltage to the negative
supply voltage. As the protection voltage will
track the negative supply voltage the over
voltage stress on the DCLIC is minimised.
Positive over voltages are clipped to ground by a
low voltage overshoot diode. Negative over
voltages are initially clipped close to the DCLIC
negative supply rail value. If sufficient current is
available from the over voltage, then the
protector will crowbar into a low voltage on-state
condition. As the over voltage subsides the high
holding current of the crowbar prevents d.c.
latchup.
The buffered gate design reduces the loading on
the DCLIC supply during over voltages caused
A SD6XAE
Terminals K1, K2 and A correspond to the alternative
line designators of T, R and G or A, B and C. The
negative protection voltage is controlled by the voltage,
VGG, applied to the G terminal.
by power cross and induction. The gate
characteristic is designed to produce a net
current drain on the interface circuit voltage
supply during low level power cross or induction.
This removes the need for a separate clamping
diode across the voltage supply.
These monolithic protection devices are
fabricated in ion-implanted planar vertical power
structures for high reliability and in normal
system operation they are virtually transparent.
Characteristic values for the R3612 are
measured either at the extremes of the DCLIC
recommended operating voltage range (-44 V to
-56 V) or at the DCLIC maximum rated supply
voltage (-70 V).
PRODUCT INFORMATION
Information is current as of publication date. Products conform to specifications in accordance
with the terms of Power Innovations standard warranty. Production processing does not
necessarily include testing of all parameters.
1






R3612 Datasheet, Funktion
R3612
PROGRAMMABLE OVERVOLTAGE PROTECTOR
FOR ERICSSON COMPONENTS 3357/3 DCLIC
DECEMBER 1995 - REVISED SEPTEMBER 1997
Repetitive Peak Forward Current, IFRM
Rated maximum (peak) value of a.c. power frequency forward current of specified waveshape and frequency
which may be applied continuously.
Critical rate of rise of on-state current, di/dt, (diT/dt)cr
Rated value of the rate of rise of current which the device can withstand without damage.
main terminal characteristics
Off-State Voltage, VD
The d.c. voltage when the device is in the off-state.
Off-State Current, ID
The d.c. value of current that results from the application of the off-state voltage, VD.
Repetitive Peak Off-State Current, IDRM
The maximum (peak) value of off-state current that results from the application of the repetitive peak off-state
voltage, VDRM.
Breakover Voltage, V(BO)
The maximum voltage across the device in or at the breakdown region measured under specified voltage rate
of rise and current rate of rise.
NOTE - Where a breakdown characteristic has several V(BO) values that need to be referenced, a numeric
suffix can be added and the relevant part of the breakdown current range specified (e.g. V(BO)1,
0 < I(BR) < 10 mA).
Holding Current, IH
The minimum current required to maintain the device in the on-state.
Off-State Capacitance, CO, CJ
The capacitance in the off-state measured at specified frequency, f, amplitude, Vd, and d.c. bias, VD.
Peak Forward Recovery Voltage, VFRM
The maximum value of forward conduction voltage across the device upon the application of a specified
voltage rate of rise and current rate of rise following a zero or specified reverse-voltage condition.
Critical rate of rise of off-state voltage, dv/dt, (dvD/dt)cr
The maximum rate of rise of voltage (below VDRM) that will not cause switching from the off-state to the on-
state.
Breakover Current, I(BO)
The instantaneous current flowing at the breakover voltage, V(BO).
Switching Voltage, VS
The instantaneous voltage across the device at the final point in the breakdown region prior to switching into
the on-state.
Switching Current, IS
The instantaneous current flowing through the device at the switching voltage, VS.
On-State Voltage, VT
The voltage across the device in the on-state condition at a specified current IT.
PRODUCT INFORMATION
6

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R3612 pdf, datenblatt
R3612
PROGRAMMABLE OVERVOLTAGE PROTECTOR
FOR ERICSSON COMPONENTS 3357/3 DCLIC
DECEMBER 1995 - REVISED SEPTEMBER 1997
WIRE A
WIRE B
R1
R2
SLIC
IC K1
TH1
D1
G
D3 D4
K2 VGG
NEGATIVE
SLIC
SUPPLY
TH2
D2 C1 D6
A
Figure 7. IC VERSION OF Figure 4
To avoid the problems of diode bridge implementation, the thyristor and series gate diode were duplicated
which allowed the bridge series thyristor diodes to be removed. This had the benefit that the protection
voltage was lowered by one diode forward voltage drop. The circuit performance of the IC was similar to the
discrete solution. Due to the integration, when the thyristor was in the on-state or the shunt diode in
conduction, about 10 mA of current was drawn from the gate supply, Figure 5. The direction of this current is
the same as that drawn by the SLIC, so it represented a small additional load on the SLIC supply and resulted
in some additional dissipation in the protector.
buffered gate protectors
The original IC design has been improved in two ways, Figure 5. Firstly, the lateral IC structure has been
changed to a vertical power device structure for increased surge current capability. Second, the series gate
diodes have been changed to transistors. The maximum current injected into the gate supply is then reduced
by the transistors gain factor (HFE). In most cases, just the lower peak gate current allows any previously used
SLIC supply rail shunt protection diode to be removed. By designing the protector such that IGT < IGAF, the net
gate current can be made to be a current drain, rather than a current injection, on the gate supply.
Fast rising surges will initially be clipped to the gate supply via the series combination of thyristor gate-
cathode diode and the transistor base-emitter diode. The overall wave forms will be similar to Figure 5 and the
supply decoupling capacitor, C1, should be dimensioned according to the text that accompanies Figure 5.
Although the SLIC supply is taken to a terminal that is internally connected to transistor bases, the terminal is
designated as the gate terminal, G.
R3612 parameters
The PBA 3357/3 DCLIC is characterised over a 0°C to 70°C temperature range. To ensure correct operation,
the R3612 protector is characterised on key paraters over the same temperature range. To ensure service
restoration after an over voltage, the R3612 holding current is 105 mA minimum, which matches the 105 mA
maximum line current of the PBA 3357/3. Typically the PBA3357/3 supply voltage will be -50 V ±6 V, but this
could rise to a maximum rated value of -70 V. To cover these conditions the R3612 is rated at -100 V with
electrical characteristics given at -48 V. The series overcurrent protector characteristic should be coordinated
with the a.c. ratings of the R3612. Overshoot voltages are measured under 0.5/700 µs conditions. This
PRODUCT INFORMATION
12

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