Vishay LPS800L4R70FB Power resistor for mounting onto a heatsink thick film technology Datasheet

LPS 800
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
FEATURES
• 800 W at 85 °C bottom case temperature
• Wide resistance range: 0.3 Ω to 900 kΩ
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
LPS 800
I5U 5 %
V2
60
25.2
21.2
15.2
36
64.7
2 x M4 useful depth: 8
2 x Ø 4.2
Ø 20
13.6
34
57
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
0.3 Ω to 900 kΩ
Tolerances (Standard)
± 1 % to ± 10 %
Power Rating and
Thermal Resistance
Temperature Coefficient
- 55 °C/175 °C
IEC 60115-1
Standard
Limiting Element Voltage UL
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
Climatic Category
Document Number: 50054
Revision: 27-Oct-10
- 55 °C to 175 °C
55/175/56
Dielectric Strength
IEC 60115-1, 1 min,
10 mA max.
800 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
Insulation Resistance
≥ 104 MΩ
Inductance
≤ 0.1 µH
Critical Resistance
31.25 kΩ
For technical questions, contact: [email protected]
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67
LPS 800
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
PERFORMANCE
TESTS
CONDITIONS
REQUIREMENTS
IEC 60115-1
1.5 x Pr/10 s
Umax. ≤ UL = 5000 V
± (0.25 % + 0.05 Ω)
IEC 60115-1/IEC 60068-2-14 Test Na
50 cycles
- 55 °C to + 175 °C
± (0.5 % + 0.05 Ω)
IEC 60115-1
1000 h (90/30) Pr at 85 °C
± (0.5 % + 0.05 Ω)
IEC 60115-1
56 days RH 95 %/40 °C
± (0.5 % + 0.05 Ω)
MIL STD 202 Method 204 Cond. D
(10 g; 5/500 Hz)
± (0.25 % + 0.05 Ω)
IEC 60115-1
(55/175/56)
± (1 % + 0.05 Ω)
Momentary Overload
Rapid Temperature Change
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 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.
LPS 800
Tightening Torque on Heatsink
2 Nm
• The following accessories are supplied with each product: 2 screws CHC M4 * 25 class 8.8 and 2 M4 contact lock washers for
heatsink mounting,
2 screws TH M4 * 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 175 °C. The dissipated power is simply calculated by the following ratio:
ΔT
P = ---------------------------------------------------------[ R TH (j - c) + R TH (c - a) ]
P:
ΔT:
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 800 power dissipation 180 W at + 50 °C room temperature.
ΔT ≤ 175 °C - 50 °C = 125 °C
ΔT
125
RTH (j - c) + RTH (c - a) = ------- = ---------- = 0.69 °C/W
P
180
RTH (j - c) = 0.112 °C/W
RTH (c - a) = 0.69 °C/W - 0.112 °C/W = 0.578 °C/W
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For technical questions, contact: [email protected]
Document Number: 50054
Revision: 27-Oct-10
LPS 800
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
Vishay Sfernice
OVERLOADS
POWER RATING
In any case the applied voltage must be lower than UL = 5000 V.
Short time overload: 1.5 x Pr/10 s
Accidental overload: The values indicated on the following
graph are applicable to resistors in air or mounted onto a
heatsink.
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
RATED DISSIPATION IN %
10 000
ENERGY IN J
1000
100
10
1
0.1
10-6
100
80
60
40
20
0
10-5
10-4
10-3
10-2
10-1
1
0
50
85
100
150
175
200
BOTTOM CASE TEMPERATURE IN °C
OVERLOAD DURATION IN s
MARKING
PACKAGING
Series, style, ohmic value (in Ω), tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
Box of 15 units
ORDERING INFORMATION
LPS
800
100 kΩ
±1%
xxx
BO15
e
MODEL
STYLE
RESISTANCE
VALUE
TOLERANCE
CUSTOM
DESIGN
Optional
on request:
Special TCR,
shape etc.
PACKAGING
LEAD (Pb)-FREE
±1%
±2%
±5%
± 10 %
GLOBAL PART NUMBER INFORMATION
L
GLOBAL
MODEL
LPS 800
P
S
0
8
0
0
H
4
7
R
0
J
B
DIELECTRIC
OHMIC VALUE
TOLERANCE
PACKAGING
SPECIAL
L = Dielectric
strength 7 kV
H = Dielectric
strength 12 kV
The first three digits are
significant figures and the
last digit specifies the
number of zeros to follow. R
designates decimal point.
F=1%
G=2%
J=5%
K = 10 %
B = Box 15 pieces
As applicable
ZAx
48R7 = 48.7 Ω
47R0 = 47 Ω
1001 = 1 kΩ
4R70 = 4.7 Ω
R240 = 0.24 Ω
Document Number: 50054
Revision: 27-Oct-10
For technical questions, contact: [email protected]
www.vishay.com
69
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Document Number: 91000
Revision: 11-Mar-11
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