DRTOP100 [VISHAY]
Power Resistors for Mounting onto a Heatsink Thick Film Technology; 功率电阻安装在散热片厚膜工艺
| 型号： | DRTOP100 |
| 厂家： | 
VISHAY |
| 描述： | Power Resistors for Mounting onto a Heatsink Thick Film Technology |
| 文件： | 总4页 (文件大小：465K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RTOP
Vishay Sfernice
Power Resistors for Mounting onto a Heatsink
Thick Film Technology
FEATURES
• 1% tolerance available
• High power rating
• Wide ohmic value range
• Non inductive
• Easy mounting
• Low thermal radiation of the case
• Standard Isotop case (SOT 227 B)
This series of thick film power resistors include modules which can incorporate up to 2 different resistor values in the same SOT
227B package. Two types of terminations are available along with a 4 terminal device for measurement applications in the case
of the single resistor version. This product range benefits from Vishay Sfernice’s experience in thick film power resistor technol-
ogy i.e high power: volume ratio, low tolerance or individual resistors and excellent overload capabilities (due to the trimming
technique).
DIMENSIONS in millimeters
RTOP
V Connections
• Tolerances unless otherwise specified: ± 0.3mm
MECHANICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
Mechanical Protection
Substrate
Resistive Element
End Connection
Tightening Torque Connections 1 Nm
Tightening Torque Heatsink 2 Nm
Insulated case
Alumina on insulated base
Cermet
Resistance Range
Standard Tolerance
Power Rating
0.046 to 1MΩ
± 1% to ± 10%
V connections: screw M4 x 6
50W to 200W at + 25°C
Temperature Coefficient
ENVIRONMENTAL SPECIFICATIONS
Standard
± 300 ppm/˚C (R < 1)
± 150 ppm/˚C (R > 1)
Temperature Range
- 55°C to + 125°C
Climatic Category
55/125/56
Insulation Resistance
> 106MΩ
Document Number: 50045
Revision 14-Jan-04
www.vishay.com
27
For technical questions, contact sfer@vishay.com
RTOP
Power Resistors for Mounting onto a Heatsink
Thick Film Technology
Vishay Sfernice
PERFORMANCE
TESTS
CONDITIONS
TYPICAL DRIFTS
Momentary Overload
Rapid Temperature Change
Load Life
NF EN 140000 CEI 115_1
2.5Pn/5 seconds
< ± (0.25% + 0.05Ω)
NF EN 140000 CEI 68214 Test Na
5 cycles - 55°C +125°C
< ± (0.25% + 0.05Ω)
< ± (0.5% + 0.05Ω)
< ± (0.5% + 0.05Ω)
NF EN 140000 CEI 115_1
Pn at 25°C 1000 hours
Humidity (steady state)
MIL STD 202 Method 103 B Test D
56 days 95% R.H.
SPECIAL FEATURES
MODEL
RTOP 200
RTOP 100
DRTOP 100
DRTOP 50
Power Rating at + 25°C
chassis mounted resistors
unmounted resistors
200W
5W
100W
5W
100W
3.5W
50W
3.5W
Thermal Resistance (per resistor)
0.5°C/W
1500V
1°C/W
1500V
0.5°C/W
500V
1°C/W
500V
Limiting Voltage
Dielectric Strength*
connections/chassis
2500V, 1 Minute
10mA Max
2500V, 1 Minute
10mA Max
2500V, 1 Minute
10mA Max
2500V, 1 Minute
10mA Max
Dielectric Strength*
connections/resistors
-
-
2500V, 1 Minute
10mA Max
2500V, 1 Minute
10mA Max
Ohmic Value Range
Tolerance
0.046 to 1MΩ
0.092 to 1MΩ
± 1% to ± 10%
± 1% to ± 10%
Electrical Diagrams
R2
R1
R
R
Shunt Version
*MIL STD 202 Method 301
www.vishay.com
28
Document Number: 50045
Revision 14-Jan-05
For technical questions, contact sfer@vishay.com
RTOP
Vishay Sfernice
Power Resistors for Mounting onto a Heatsink
Thick Film Technology
CHOICE OF 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:
expressed in W
∆T: 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 Table Special Features).
RTH: (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.
Example:
RTH: (c-a) for RTOP 200 power rating 130W at ambient temperature + 30°C.
Thermal resistance (see table 1) RTH (j-c): 0.5°C/W
∆T ≤ 125°C - 30°C - ≤ 95°C
95
130
∆T
P
RTH (j-c) + RTH (c-a) =
=
= 0.73°C/W
RTH (j-c) ≤ 0.5°C/W
RTH (c-a) ≤ 0.73°C/W - 0.5°C/W ≤ 0.23°C/W
RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK
Surfaces in contact must be carefully cleaned.
The heatsink must have an acceptable flatness: from 0.05mm to 0.1mm/100mm.
Roughness of the heater must be around 6.3µm.
In order to improve thermal conductivity, surfaces in contact (alumina, heatsink) are laid on with a silicone grease (type SI 340
from Rhône-Poulenc or Dow 340 from Dow Corning).
Tightening torque on heater: 2 Nm
For the electrical connections, it is recommended to use M4 x 6 screws and if necessary a washer of 1mm thickness. The
recommended screw tightening torque is 1 Nm.
Document Number: 50045
Revision 14-Jan-04
www.vishay.com
29
For technical questions, contact sfer@vishay.com
RTOP
Vishay Sfernice
Power Resistors for Mounting onto a Heatsink
Thick Film Technology
OVERLOADS
The applied power is 2.5 x rated power for 5 s with a max voltage of 2 x nominal voltage.
Accidental overload: The values indicated in the graph below are applicable to resistors in air or mounted onto a heatsink.
In case of multi-resistor devices, (DRTOP, TROP and QROP) the results apply to each resistor value in the device.
ENERGY CURVE
1000
100
10
1
0.1
0.01
1.10-7
1.10-6
RTOP
1.10-5
1.10-4
1.10-3
1.10-2
1.10-1
1
OVERLOAD DURATION IN SECONDS
DRTOP
POWER RATING CHART
The temperature of the heater should be maintained in the limit specified. To improve the thermal conductivity, surfaces in
contact should be laid on with a silicon grease and the torque applied on the screw for tightening should be around 2 Nm.
100
80
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 %), manufacturing date, VISHAY trade mark.
ORDERING INFORMATION
RTOP
200
3.2
± 1%
± %
V
R1
T1
R2
ABSOLUTE TOLERANCE PER RESISTOR
MODEL
STYLE
OHMIC VALUE
CONNECTIONS
CUSTOM DESIGN
Optional
RTOP
DRTOP
100
50
Optional
± 1%
To be precise
for each
V: Screw
VS: RTOP Shunt
± 2%
resistor
± 5 %
± 10 %
www.vishay.com
30
Document Number: 50045
Revision 14-Jan-05
For technical questions, contact sfer@vishay.com
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