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| LPS 300 Vishay Sfernice Power Resistor for Mounting onto a Heatsink Thick Film Technology FEATURES * 300 W at 85 C bottom case temperature * Wide resistance range: 0.3 to 900 k E24 series * Non inductive * Easy mounting * Low thermal radiation of the case * Compliant to RoHS directive 2002/95/EC DIMENSIONS in millimeters 25.8 1 60 36 LPS 300 6K8 5 % V2 25.2 21.2 15.2 64.7 2 x O 4.2 34 57 2 x M4 useful depth: 8 O 20 13.6 Note * Tolerances unless stated: 0.2 mm MECHANICAL SPECIFICATIONS Mechanical Protection Resistive Element Substrate End Connections Tightening Torque - On Connections - On Heatsink Maximum Torque Weight Insulated case UL 94 V-0 Thick film Alumina Screws M4 2 Nm 2 Nm 2.5 Nm 83 g 10 % ELECTRICAL SPECIFICATIONS Resistance Range Tolerances (Standard) Power Rating and Thermal Resistance Temperature Coefficient - 55 C/120 C IEC 60115-1 Standard 0.3 to 900 k 1 % to 10 % 300 W at + 85 C bottom case temperature RTH (j - c): 0.112 C/W R 1 U: 500 ppm/C 1 U < R 10 U: 300 ppm/C 10 U < R: 150 ppm/C 5 kV 7 kVRMS or 12 kVRMS 104 M 0.1 H 83.33 k Limiting Element Voltage UL ENVIRONMENTAL SPECIFICATIONS Temperature Range Climatic Category - 55 C to 120 C 55/120/56 Dielectric Strength IEC 60115-1, 1 min, 10 mA max. Insulation Resistance Inductance Critical Resistance Document Number: 50052 Revision: 09-Jun-10 For technical questions, contact: sfer@vishay.com www.vishay.com 61 LPS 300 Vishay Sfernice Power Resistor for Mounting onto a Heatsink Thick Film Technology PERFORMANCE TESTS Momentary Overload CONDITIONS IEC 60115-1 4 x Pr/10 s Umax. UL = 5000 V IEC 60115-1/IEC 60068-2-14 Test Na 5 cycles - 55 C to + 120 C IEC 60115-1 1000 h (90/30) Pr at 85 C IEC 60115-1 56 days RH 95 %/40 C MIL STD 202 Method 204 Cond. D (10 g; 5/500 Hz) IEC 60115-1 (55/120/56) REQUIREMENTS (0.25 % + 0.05 ) Rapid Temperature Change (0.5 % + 0.05 ) (0.5 % + 0.05 ) (0.5 % + 0.05 ) (0.25 % + 0.05 ) (1 % + 0.05 ) Load Life Humidity (Steady State) Vibration Climatic Sequence 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 (alumina, heatsink) should be coated with a silicone grease (type SI 340 from Rhone-Poulenc or Dow 340 from Dow Corning) or a thermal film (type Q Pad II) easier and faster to install than the grease. * The fastening of the resistor to the heatsink is under pressure control of two screws tightened at 2 Nm for full power availability. Tightening Torque on Heatsink LPS 300 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. 2 off CHC M4 x 16/16 class 8. CHOICE OF THE HEATSINK The user must choose the heatsink according to the working conditions of the component (power, room temperature). Maximum working temperature must not exceed 120 C. The dissipated power is simply calculated by the following ratio: T P = --------------------------------------------------------[ R TH (j - c) + R TH (c - a) ] P: T: RTH (j - c): RTH (c - a): Expressed in W Difference between maximum working temperature and room temperature Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the component: (see specifications environmental paragraph). Thermal resistance value measured between outer side of the resistor and room temperature. It is the thermal resistance of the thermal interface, the heatsink (type, shape) and the quality of the fastening device. Example: RTH (c - a) for LPS 300 power dissipation 180 W at + 50 C room temperature. T 120 C - 50 C = 70 C P T 70 RTH (j - c) + RTH (c - a) = ------- = --------- = 0.388 C/W 180 RTH (j - c) = 0.112 C/W RTH (c - a) = 0.388 C/W - 0.112 C/W = 0.276 C/W www.vishay.com 62 For technical questions, contact: sfer@vishay.com Document Number: 50052 Revision: 09-Jun-10 LPS 300 Power Resistor for Mounting onto a Heatsink Thick Film Technology OVERLOADS In any case the applied voltage must be lower than UL = 5000 V. Short time overload: 4 x Pn/10 s Accidental overload: The values indicated on the following graph are applicable to resistors in air or mounted onto a heatsink. Vishay Sfernice POWER RATING The temperature of the case should be maintained within the limits specified in the following figure. To optimize the thermal conduction, contacting surfaces should be coated with silicone grease or thermal film, and heatsink mounting screws tightened to 2 Nm. ENERGY CURVE 10 000 1000 RATED DISSIPATION IN % 100 80 60 40 20 0 ENERGY IN J 100 10 1 0.1 10-6 10-5 10-4 10-3 10-2 10-1 1 0 50 85 100 120 150 200 OVERLOAD DURATION IN s BOTTOM CASE TEMPERATURE IN C MARKING Series, style, ohmic value (in ), tolerance (in %), manufacturing date, Vishay Sfernice trademark. PACKAGING Box of 15 units ORDERING INFORMATION LPS MODEL 300 STYLE 100 k RESISTANCE VALUE 1% TOLERANCE 1% 2% 5% 10 % xxx CUSTOM DESIGN Optional on request: Special TCR, shape etc. BO15 PACKAGING e LEAD (Pb)-FREE GLOBAL PART NUMBER INFORMATION L P S 0 3 0 0 H 4 7 R 0 J B GLOBAL MODEL LPS 300 DIELECTRIC L = Dielectric strength 7 kV H = Dielectric strength 12 kV OHMIC VALUE The first three digits are significant figures and the last digit specifies the number of zeros to follow. R designates decimal point. 48R7 = 48.7 47R0 = 47 1001 = 1 k 4R70 = 4.7 R240 = 0.24 TOLERANCE F=1% G=2% J=5% K = 10 % PACKAGING B = Box 15 pieces N = Box 15 pieces N/A (1 to 14 pieces by box) SPECIAL As applicable ZAx Document Number: 50052 Revision: 09-Jun-10 For technical questions, contact: sfer@vishay.com www.vishay.com 63 Legal Disclaimer Notice Vishay Disclaimer All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners. Document Number: 91000 Revision: 18-Jul-08 www.vishay.com 1 |
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