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Part: RPS500
Category:
Description: Power Resistors For Mounting Onto a Heatsink Featuring High Overload Capability, Easy Mounting, Low Thermal Radiation of The Case, no Partial Discharge
Company: Vishay Intertechnology
Datasheet: Download RPS500 datasheet File size : 197 kB
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Datasheet text preview:
RPS 500
Vishay Sfernice
Power Resistors for Mounting onto a Heatsink Thick Film Technology
FEATURES
· High power rating · High overload capability · Easy mounting · Low thermal radiation of the case · No partial discharge
This range has been developed specifically for electrical traction applications and is capable of dissipating 500W at +70°C. The remarkable performance characteristics are evident when used in severe pulse conditions. The copper base allows easy mounting on the heatsink and provides optimal dissipation conditions.
DIMENSIONS in millimeters
RPS 500D
73 56
10.5
6
26 ± 1
57 34
Ø 7.2 35.8 2 M4 USEFUL DEPTH : 8
· Tolerance unless stated: ± 0.2mm
60
Ø 4.2
MECHANICAL SPECIFICATIONS
Mechanical Protection Substrate Insulated case Alumina onto base of nickel coated copper Resistive Element Cermet End Connections Screws M4 (M5 on request) Tightening Torque on Connections 2Nm Tightening Torque on Heatsink 4Nm Weight 250g ± 10%
Ø 21
ELECTRICAL SPECIFICATIONS
Resistance Range Tolerances Power Rating Chassis mounted Temperature Coefficient Standard Limiting Element Voltage Dielectric Strength Partial Discharge ± 300ppm/°C 1 5kVRMS L:7kVRMS - H: 14kVRMS Inception voltage 2.5kVRMS > 106M < 50 nH 500W at 70°C continuous 1000W at 25°C for 10 seconds 0.24 to 1M E24 series ± 1% to ± 10%
ENVIRONMENTAL
Thermal Resistance Temperature Range Climatic Category
www.vishay.com 34
RTH (j-c) 0.11°C/W - 55°C to + 125°C 55/125/56
Insulation Resistance Inductance
For technical questions, contact sfer@vishay.com
Document Number: 50047 Revision 20-Mar-02
RPS 500
Power Resistors for Mounting onto a Heatsink Thick Film Technology
PERFORMANCE
TESTS Momentary Overload Climatic Sequence Load Life (chassis mounted) Humidity (steady state) CONDITIONS 2Pn/10 seconds 5 cycles - 55°C to + 125°C 1000 hours 500 W/70°C 56 days 95% R.H. TYPICAL DRIFTS < ± (0.25% ± 0.05) < ± (0.25% ± 0.05) < ± (0.5% ± 0.05) < ± (0.5% ± 0.05)
Vishay Sfernice
RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR
Ohmic Standard Tolerance Standard T.C.R. Tolerance On Request 1 ± 5% ± 150ppm/°C
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 125°C. The dissipated power is simply calculated by the following ratio: (1) T P= [RTH (j-c) + RTH (c-a)] P: T: RTH: RTH: expressed in W difference between maximum working temperature and room temperature. (j-c): thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the component: 0.11°C/W. (c-a): thermal resistance value measured between outer side of the resistor and room temperature. It is the thermal resistance of the heatsink, depending on the heatsink itself (type, shape) and the quality of the fastening device.
RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK
Surfaces in contact must be carefully cleaned. The heater must have an acceptable flatness: from 0.05mm to 0.1mm/100mm. Roughness of the heatsink must be around 6.3µm. In order to improve thermal conductivity, surfaces in contact (alumina, heatsink) should be coated with a silicon grease (type SI 340 Rhône-Poulenc or Dow Corning). The fastening of the resistor to the heatsink is under pressure control of two screws. Tightening torque: 4Nm. The following accessories are supplied with each product: 2 off M 4 x 16, 2 off M4 TE 4 x 0.6 and 2 off M4 washers.
Document Number: 50047 Revision 20-Mar-02
For technical questions, contact sfer@vishay.com
www.vishay.com 35
RPS 500
Vishay Sfernice
OVERLOADS
Short time overload: 2Pn/10 seconds Accidental overload: The values indicated in the graph below are applicable to resistors in air or mounted onto a heatsink.
Power Resistors for Mounting onto a Heatsink Thick Film Technology
ENERGY CURVE
10000
ENERGY IN JOULES
1000
100
10
1
1.10-7
1.10-6
1.10-5
1.10-4
1.10-3
1.10-2
1.10-1
1
OVERLOAD DURATION IN SECONDS
POWER RATING CHART
The heatsink temperature should be maintained at the values specified in fig. 2. To optimise the thermal conduction, contacting surfaces should be coated with silicone grease and heatsink mounting screws tightened to 4Nm.
100
80
% RATED POWER
60
40
20
0 0 20 40 60 80 100 120 140 HEATSINK TEMPERATURE IN DEGREES CELSIUS
MARKING
Series, style, ohmic value (in ), tolerance (in ), tolerance (in %), manufacturing date, VISHAY trade mark.
ORDERING INFORMATION
RPS MODEL 500D STYLE H CONNECTIONS Optional H: dielectric strength 14kV L: dielectric strength 7kV 100 RESISTANCE VALUE ± 10% TOLERANCE Optional ± 1% ± 2% ± 5% ± 10% xxx CUSTOM DESIGN Options on request T.C.R., shape, etc.
www.vishay.com 36
For technical questions, contact sfer@vishay.com
Document Number: 50047 Revision 20-Mar-02
Others parts begin by rp
RP-1 RP-2 RP-3 RP-4 RP-5 RP-6
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