LVM2P-015R10431 230VAC 400VAC 275VACRMS IEC60950 IEC60335 IEC61000-4-5 85VAC - Datasheet Archive

 

Integrated Overcurrent/Overvoltage/Overtemperature Solutions for industrial equipment 2PRO LVM2P-015R10431 DEVICE The 2Pro

 

APPLICATION NOTE Integrated Overcurrent/Overvoltage/Overtemperature Solutions for industrial equipment 2PRO LVM2P-015R10431 LVM2P-015R10431 DEVICE The 2Pro LVM2P-015R10431 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 LVM2P-015R10431 devices help provide protection for AC input LED lighting systems, PLC network adapters, cell phone chargers, AC/DC power supplies*, modem power supplies, ACpanel 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 device's maximum continuous operating voltage rating, VACRMS. 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 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. * AC/DC power supplies up to 30VA as input power for 230VAC 230VAC input voltage Electrical Schematic (1) (2) (3) 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 400VAC 400VAC instead of 230VAC 230VAC, 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 275VACRMS 275VACRMS 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 device's 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 IEC60950 and IEC60335 IEC60335, and helps equipment remain operational after specified lightning tests according to IEC61000-4-5 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. www.circuitprotection.com · 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: 85VAC 85VAC to 265VAC 265VAC Max input current @ 20°C: 150 mARMS Power range: up to 30VA for 230VAC 230VAC input voltage at 20°C High safe interrupt power: 415VACRMS/40ARMS 415VACRMS/40ARMS 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 240VAC 240VAC input voltage - 15VA as input power for 120VAC 120VAC input voltage Modem power supply AC panel protection modules AC Line power supplies AC power meters White goods, appliances, industrial controls 500 450 400 350 300 250 200 150 100 50 0 LVM2P-015R10431 LVM2P-015R10431 Unprotected Varistor 4W /10 Ohms Power R + Varisitor Fire Hazard Safe 0 10 5 LVM2P-015R10431 LVM2P-015R10431 - IEC61000-4-5 IEC61000-4-5 - 1.2/50 - 8/20µs R(source) = 2 Ohms - V(Open circuit) = 2kV 2000 200 Varistor Input Volt 1500 150 Current 1000 100 500 50 0 0 0 50 100 150 Time (µs) Figure 4 : Typical 2Pro LVM2P-015R10431 LVM2P-015R10431 device response to loss of neutral event LVM2P-015R10431 LVM2P-015R10431 (Neutral lost) 380VAC 380VAC - R =10Ohms 2.5 PPTC Trip 2.0 Figure 1 : Typical circuit diagram utilizing the 2Pro LVM2P-015R10431 LVM2P-015R10431 device Voltage (V) 400 LVM2P Industrial Equipment Line Neutral 20 Figure 3 : Typical 2Pro LVM2P-015R10431 LVM2P-015R10431 device response under IEC61000-4-5 IEC61000-4-5 surge immunity test 600 240VAC 240VAC / 120VAC 120VAC 15 Time (s) 1.5 1.0 200 0.5 0 0 -0.5 -200 Current (A) · · · · · The figure below illustrates the effects of abnormal overvoltage conditions (400VRMS 400VRMS, 4ASC) on three devices or a combination of devices: 1) LVM2P-015R10431 LVM2P-015R10431 combination (PPTC, MOV) 2) Single MOV (10mm, 275VRMS 275VRMS ­ ROV10-431K ROV10-431K) 3) MOV/4W Power Resistor (10 Ohms) Current (A) FEATURES Figure 2 : Typical surface temperature vs. time for various protection schemes Surface Temperature (°C) 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 60950/IEC60335 · Helps equipment comply with: - IEC61000-4-5 IEC61000-4-5 ­ Surge immunity test - IEC61000-4-4 IEC61000-4-4 ­ Electrical fast transient/burst immunity test - IEC61000-4-2 IEC61000-4-2 ­ Electrostatic discharge immunity test · Reduces cost by eliminating need for additional fuse or power resistor in the power line Voltage (V) BENEFITS -1.0 380 VAC input (V) Varistor (V) Current (A) -400 -600 -0.1 0.1 0.3 0.5 0.7 0.9 1.1 -1.5 -2.0 -2.5 Time (s) 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 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 Corporation 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 Tyco Electronics 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 changes without notification to Buyer-to materials or processing that do not affect compliance with any applicable specification. © 2008 Tyco Electronics Corporation. All rights reserved. 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