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LPS600H47R0GB Datasheet(PDF) 2 Page - Vishay Siliconix |
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LPS600H47R0GB Datasheet(HTML) 2 Page - Vishay Siliconix |
2 / 4 page Document Number: 50053 For technical questions, contact: sfer@vishay.com www.vishay.com Revision: 27-Oct-10 65 LPS 600 Power Resistor for Mounting onto a Heatsink Thick Film Technology Vishay Sfernice 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 µm. In order to improve thermal conductivity, surfaces in contact (alumina, heatsink) should be coated with a silicone grease (type SI 340 from Rhône-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. • 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 The user must choose the heatsink according to the working conditions of the component (power, room temperature). Maximum working temperature must not exceed 155 °C. The dissipated power is simply calculated by the following ratio: P: Expressed in W ΔT: Difference between maximum working temperature and room temperature RTH (j - c): 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). RTH (c - a): 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 600 power dissipation 180 W at + 50 °C room temperature. ΔT ≤ 155 °C - 50 °C = 105 °C RTH (j - c) + RTH (c - a) = = = 0.58 °C/W RTH (j - c) = 0.112 °C/W RTH (c - a) = 0.58 °C/W - 0.112 °C/W = 0.468 °C/W PERFORMANCE TESTS CONDITIONS REQUIREMENTS Momentary Overload IEC 60115-1 2 x Pr/10 s Umax. ≤ UL = 5000 V ± (0.25 % + 0.05 Ω) Rapid Temperature Change IEC 60115-1/IEC 60068-2-14 Test Na 50 cycles - 55 °C to + 155 °C ± (0.5 % + 0.05 Ω) Load Life IEC 60115-1 1000 h (90/30) Pr at 85 °C ± (0.5 % + 0.05 Ω) Humidity (Steady State) IEC 60115-1 56 days RH 95 %/40 °C ± (0.5 % + 0.05 Ω) Vibration MIL STD 202 Method 204 Cond. D (10 g; 5/500 Hz) ± (0.25 % + 0.05 Ω) Climatic Sequence IEC 60115-1 (55/155/56) ± (1 % + 0.05 Ω) Tightening Torque on Heatsink LPS 300 2 Nm P ΔT R TH (j - c) R TH (c - a) + [] ---------------------------------------------------------- = ΔT P ------- 105 180 ---------- |
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