333 3 LPS 1100 www.vishay.com Vishay Sfernice Power Resistor for Mounting onto a Heatsink Thick Film Technology FEATURES Compliant with requirement 26 of NF-EN45545-2 LPS high power: 1100 W Wide resistance range: 1 to 1.3 k E24 series Non inductive Easy mounting Low thermal radiation of the case LINKS TO ADDITIONAL RESOURCES Material categorization: for definitions of compliance please see www.vishay.com/doc 99912 3D Models DIMENSIONS in millimeters 25.8 1 LPS 1100 25.2 I5U 5 % V2 21.2 60 15.2 0.5 36 64.7 2 x M4 useful depth: 8 2 x 4.2 20 13.6 34 57 Notes Tolerances unless stated: 0.2 mm Power dissipation is 1100 W by using a water cooled heatsink at T = 15 C of R = 0.059 C/W (25 C to the nearest point of the resistor water th onto heatsink) and R contact estimated at 0.07 C/W th STANDARD ELECTRICAL SPECIFICATIONS RESISTANCE RANGE RATED POWER P TOLERANCE TEMPERATURE COEFFICIENT 25 C MODEL W % ppm/C LPS 1100 1 to 1.3K 1100 1, 2, 5, 10 150 MECHANICAL SPECIFICATIONS TECHNICAL SPECIFICATIONS 1100 W at +25 C Insulated case and resin for Power Rating and Flammability On heatsink potting UL 94 V-0 Thermal Resistance R : 0.039 C/W th(j-c) Resistive Element Thick film Temperature Coefficient R 1 : 500 ppm/C End Connections Screws M4 (-55 C to +200 C), 1 < R 10 : 300 ppm/C IEC 60115-1 10 < R: 150 ppm/C Tightening Torque Connections 2 Nm Dielectric Strength Tightening Torque Heatsink 2 Nm IEC 60115-1, 7 kV or 12 kV RMS RMS Maximum Torque 2.5 Nm 1 min, 10 mA max. Weight 79 g 10 % Lightning test 1.2/50 s Until 12 kV IEC 61000-4-5 4 ENVIRONMENTAL SPECIFICATIONS Insulation 10 M Inductance 0.1 H Temperature Range -55 C to +200 C 100 pC/7 kV Climatic Category 55 / 200 / 56 Partial Discharge 10 pC/5 kV (for LPS 1100 D only) Other cases: Consult us Revision: 13-Apr-2021 Document Number: 50059 1 For technical questions, contact: sferfixedresistors vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000 DDD D LPS 1100 www.vishay.com Vishay Sfernice PERFORMANCE TESTS CONDITIONS REQUIREMENTS IEC 60115-1: 2 x P / 10 s for heatsink with r R 0.26 C/W (maximum power: 700 W) th(h-a) Momentary Overload (0.25 % + 0.05 ) 1.6 x P / 1 s for heatsink with 0.26 C/W > R 0.059 C/W r th(h-a) (maximum power: 1800 W) AEC-Q200 conditions: IEC 60115-1/IEC 60068-2-14, Test Na 50 cycles (-55 C to +200 C) (0.5 % + 0.05 ) for all the ohmic values Rapid Temperature Change (5 % + 0.05 ) for R < 38 1000 cycles (-55 C to +200 C) (0.5 % + 0.05 ) for R 38 AEC-Q200 conditions: IEC 60115-1 (5 % + 0.05 ) for R < 38 Load Life 2000 h (90/30) P (0.5 % + 0.05 ) for R 38 r Humidity (Steady State) AEC-Q200 conditions: IEC 60115-1, 1000 h RH 85 % / 85 C (0.5 % + 0.05 ) AEC-Q200 conditions: MIL-STD-202 method 213 condition D Mechanical Shock (1 % + 0.05 ) (100 gs / 6 ms 3.75 m/s) AEC-Q200 conditions: MIL-STD-202 method 204 condition D Vibration (1 % + 0.05 ) (5 g, 20 min 10/2000 Hz) Climatic Sequence AEC-Q200 conditions: IEC 60115-1 (55 / 200 / 56) (1 % + 0.05 ) RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK Surfaces in contact must be carefully cleaned The heatsink must have an acceptable flatness: From 0.05 mm to 0.1 mm/100 mm Roughness of the heatsink must be around 6.3 m. In order to improve thermal conductivity, surfaces in contact (ceramic , heatsink) should be coated with a silicone grease (type Bluesil Past 340 from Blue Star Silicones). Thermal film (type Q-pad II from Berquist) is also possible, easier and faster to install than grease but with a lower efficiency for the power dissipation The fastening of the resistor to the heatsink is under pressure control of two screws tightened at 2 Nm for full power availability LPS 1100 Tightening Torque on Heatsink 2 Nm The following accessories are supplied with each product: - 2 screws CHC M4 x 25 class 8.8 and 2 M4 contact lock washers for heatsink mounting - 2 screws TH M4 x 6/6 and 2 M4 contact lock washers for connections CHOICE OF THE HEATSINK AND THE THERMAL INTERFACE The user must choose the heatsink according to the working conditions of the component (power, room temperature). Maximum working temperature must not exceed 200 C. The dissipated power is simply calculated by the following ratio: T P = --------------------------------------------------------------------------------------------- R ++ R R th (j - c) th (c - h) th (h - a) P: Expressed in W T: Difference between maximum working temperature and room temperature or fluid cooling temperature R : Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal th (j - c) resistance of the component: 0.039 C/W R : Thermal resistance value measured between outer side of the resistor and upper side of the heatsink. This is the th (c - h) thermal resistance of the interface (grease, thermal pad), and the quality of the fastening device R : Thermal resistance of the heatsink th (h - a) Example: R + R for LPS 1100 power dissipation 850 W at +18 C fluid temperature th (c - h) th (h - a) T 200 C - 18 C = 182 C T 182 ------- ---------- R + R + R == = 0.214 C/W th (j - c) TH (c - h) TH (h - a) P 850 R = 0.039 C/W th (j - c) R + R==0.214 C/W - 0.039 C/W 0.175 C/W th (c - h) th (h - a) Revision: 13-Apr-2021 Document Number: 50059 2 For technical questions, contact: sferfixedresistors vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000