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LPS0300H1001JN Datasheet(PDF) 2 Page - Vishay Siliconix

Part # LPS0300H1001JN
Description  Power Resistor for Mounting onto a Heatsink Thick Film Technology
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Manufacturer  VISHAY [Vishay Siliconix]
Direct Link  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

LPS0300H1001JN Datasheet(HTML) 2 Page - Vishay Siliconix

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For technical questions, contact: sfer@vishay.com
Document Number: 50052
62
Revision: 09-Jun-10
LPS 300
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
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. 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:
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 300 power dissipation 180 W at + 50 °C room temperature.
ΔT ≤ 120 °C - 50 °C = 70 °C
RTH (j - c) + RTH (c - a) =
=
= 0.388 °C/W
RTH (j - c) = 0.112 °C/W
RTH (c - a) = 0.388 °C/W - 0.112 °C/W = 0.276 °C/W
PERFORMANCE
TESTS
CONDITIONS
REQUIREMENTS
Momentary Overload
IEC 60115-1
4 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
5 cycles
- 55 °C to + 120 °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
(55/120/56)
± (1 % + 0.05
Ω)
Tightening Torque on Heatsink
LPS 300
2 Nm
P
ΔT
R
TH (j - c)
R
TH (c - a)
+
[]
----------------------------------------------------------
=
ΔT
P
-------
70
180
----------


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