ertemperature
Solutions for industrial equipment
2PRO LVM2P-015R10431 DEVICE
The
2Pro
LVM2P-015R10431
device
is
an
integrated
overcurrent/overvoltage/overtemperature
circuit
protection
device that helps protect a wide variety of low-power systems
against damage caused by overvoltage faults, including lightning
strikes, ESD surges, loss of neutral, incorrect input voltage and
power induction.
The
RoHS-compliant
2Pro
device
combines
a
PolySwitch
polymeric positive temperature coefficient (PPTC) overcurrent
device with a metal oxide varistor (MOV) component into one
innovative, thermally protected device to help provide resettable
current limiting for overcurrent protection and voltage clamping
during overvoltage events. This single-device approach helps
manufacturers
meet
industry
test
requirements,
reduce
component count, and improve equipment reliability.
The 2Pro LVM2P-015R10431 devices help provide protection for
AC Mains LED lighting systems, PLC network adapters, cell phone
chargers, AC/DC power supplies*, modem power supplies, AC-
panel protection modules, AC power meters, white goods and
home and professional appliances.
HOW IT WORKS
Under normal operating conditions, the AC line voltage applied
to an MOV is not expected to exceed the devices maximum
continuous
operating
voltage
rating,
V
ACRMS
.
However,
occasionally overvoltage transients may occur that exceed these
limits. By integrating PPTC technology with the MOV, the 2Pro
device
helps
provide
increased
overcurrent
and
thermal
protection under conditions where the MOV is exposed to
prolonged continuous overvoltage events that exceed its rated
specifications. In the event of an overvoltage transient, the PPTC
element of the 2Pro device heats up and goes into a high
resistance, helping to reduce the risk of MOV device failure.
LVM2P-015R10431 devices are 10mm radial-leaded devices that
utilize three leads. In the following electrical schematic, the lead
(1) is connected to the PPTC element, lead (2) is connected to the
MOV/PPTC series connection (providing a path to ground), and
lead (3) is connected to the MOV.
APPLICATION NOTE
www.circuitprotection.com
(1)
(2)
(3)
Electrical Schematic
PROTECTING AGAINST THERMAL RUNAWAY
In AC line applications, loss of neutral may occur so that the MOV
is exposed to a higher level of sustained overvoltage than it is
rated for. The worst case scenario would be a voltage of 400V
AC
instead of 230V
AC
, derived from a loss of neutral. In an unlimited
current condition the unprotected MOV will first fall to low
impedance of a few Ohms, but due to the high amount of energy
it is likely to rupture rather than protect. If there are devices used
on the AC line return path that limit current flow these may also
overheat due to the failure of the MOV.
Standard unprotected MOVs are typically rated to 275V
ACRMS
for
a universal input voltage range. In a loss of neutral condition they
may overheat with disastrous consequences (Fig 2), even if a fuse
or power resistor is used upstream. The 2Pro devices PPTC
element helps prevent thermal runaway, maintaining varistor
surface temperature at less than 150°C, and preventing the device
from reaching combustible temperatures caused by overvoltage
transients.
The 2Pro device helps manufacturers comply with IEC60950 and
IEC60335,
and
helps
equipment
remain
operational
after
specified
lightning
tests
according
to
IEC61000-4-5.
Also,
because the PPTC element is in series with the MOV no additional
overcurrent
protection
is
required,
which
helps
reduce
component count and optimize board space.
* AC/DC power supplies up to 30VA as input power for 230V
AC
input voltage Line
Neutral
240V
AC
/ 120V
AC
LVM2P
I
n
d
u
s
t
r
i
a
l
E
q
u
i
p
m
e
n
t
The figure below illustrates the effects of abnormal overvoltage conditions
(400V
RMS
, 4A
SC
) on three devices or a combination of devices:
1) LVM2P-015R10431 combination (PPTC, MOV)
2) Single MOV (10mm, 275V
RMS
ROV10-431K)
3) MOV/4W Power Resistor (10 Ohms)
500
450
400
350
300
250
200
150
100
50
0 0
5
S
u
r
f
a
c
e
T
e
m
p
e
r
a
t
u
r
e
(

C
)
Time (s)
10
15
20
Fire Hazard
Safe
LVM2P-015R10431
Unprotected Varistor
4W /10 Ohms Power R + Varisitor
2000
1500
1000
500
0
200
150
100
50
0
0
50
100
150
V
o
l
t
a
g
e
(
V
)
C
u
r
r
e
n
t
(
A
)
Time (µs)
LVM2P-015R10431 - IEC61000-4-5 - 1.2/50 - 8/20µs
R(source) = 2 Ohms - V(Open circuit) = 2kV
Varistor
Input Volt
Current
600
400
200
0
-200
-400
-600
2.5
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-2.5
-0.1
0.1
V
o
l
t
a
g
e
(
V
)
C
u
r
r
e
n
t
(
A
)
Time (s)
LVM2P-015R10431 (Neutral lost)
380V
AC
- R =10Ohms
0.3
0.5
0.7
0.9
1.1
PPTC Trip
380 V
AC
input (V)
Varistor (V)
Current (A)
Raychem, PolySwitch, TE Logo and Tyco Electronics are trademarks. All information, including illustrations,
is believed to be reliable. Users, however, should independently evaluate the suitability of each product for
their application. Tyco Electronics makes no warranties as to the accuracy or completeness of the
information, and disclaims any liability regarding its use. Tyco Electronics only obligations are those in the
Companys Standard Terms and Conditions of Sale for this product, and in no case will Tyco Electronics be
liable for any incidental, indirect, or consequential damages arising from the sale, resale, use or misuse of
the product. Specifications are subject to change without notice. In addition, Tyco Electronics reserves the
right to make changeswithout notification to Buyerto materials or processing that do not affect
compliance with any applicable specification.
© 2007 Tyco Electronics Corporation. All rights reserved. Printed in USA. RCP00XXE.1007
BENEFITS
Single, small form factor device helps to reduce component
count and footprint.
Helps provide a safe failure mode in case of varistor overstress.
Helps reduce warranty returns.
Helps equipment comply with UL/IEC 60950/IEC60335
Helps equipment comply with:
- IEC61000-4-5 Surge immunity test
- IEC61000-4-4 Electrical fast transient/burst immunity test
- IEC61000-4-2 Electrostatic discharge immunity test
Reduces cost by eliminating need for additional fuse or power
resistor in the power line
FEATURES
Single overcurrent, overvoltage, overtemperature and ESD
protection
Resettable overcurrent protection
Helps protect varistor and other components from damage
caused by loss of neutral or abnormal AC input voltage
Normal operating mode:
Universal Input voltage range: 85V
AC
to 265V
AC
Max input current @ 20°C: 150 mA
RMS
Power range: up to 30VA for 230V
AC
input voltage at 20°C
High safe interrupt power: 415V
ACRMS
/40A
RMS
Inrush current limiter (capacitive loads)
RoHS-compliant
APPLICATIONS
Main LED lighting systems
PLC network adapters (fast Ethernet, xDSL over the main)
Cell phone chargers
AC/DC power supplies up to:
- 30VA as input power for 240V
AC
input voltage
- 15VA as input power for 120V
AC
input voltage
Modem power supply
AC panel protection modules
AC Line power supplies
AC power meters
White goods, appliances, industrial controls
Figure 2 : Typical surface temperature vs. time for various
protection schemes
Figure 3 : Typical 2Pro LVM2P-015R10431 device response under
IEC61000-4-5 surge immunity test
Figure 4 : Typical 2Pro LVM2P-015R10431 device response to loss
of neutral event
Figure 1 : Typical circuit diagram utilizing the 2Pro
LVM2P-015R10431 device
Raychem Circuit Protection Products
308 Constitution Drive, Building H
Menlo Park, CA USA 94025-1164
Tel
: (800) 227-7040, (650) 361-6900
Fax : (650) 361-4600
www.circuitprotection.com
www.circuitprotection.com.hk (Chinese)
www.tycoelectronics.com/japan/raychem (Japanese) LVM2P-015R10431 Electrical Characteristics
LVM2P-015R10431
0.15
0.30
6.5
14.0
16.0
0.9
3
LVM2P Electrical Characteristic
Overcurrent (terminals 1 2) Performance ratings @ 20°C
I
HOLD
(A)
I
TRIP
(A)
Resistance
(
)
R min.
R max.
R1 max*
Part Number
Time to Trip (s)
@ 1A
Typ
Max
LVM2P-015R10431
430
± 10%
>10
710
0.25
Overvoltage (terminals 2 3)
DC Resistance
@ 100V
(M
)
Part Number
Varistor Voltage
V @ 1mA
DC(V)
Tolerance
Maximum Clamping
Voltage @ 25A
(V)
Rated
Wattage
(W)
* Maximum device resistance at 20°C measured 1 hour post trip.
Corresponds to operation below varistor voltages.
Surge Immunity for the assembly (Terminals 1-3) @20C
IEC / EN 61000-4-5
2000
1.2 x 50
1000
8 x 20
5 ea. Polarity
Parameter
Voltage - Open Circuit
Voltage
Waveform
(V)
(µs)
Current - Short Circuit
Current
Waveform
(A)
(µs)
Repetitions