FPRꢀFPS 2/4-T220ꢀT221
PrecisionꢀPowerꢀShuntꢀResistors
SPECIFICATIONS (continued)
Temperature Coefficient
tableꢀA
4000
2000
0
250
200
+15ppm/K
150
100
-15ppm/K
-2000
-4000
-6000
Limit 2 (3σ)
Nominal ∆R/R
Limit 1 (3σ)
50
0
-8000
2
5
10
20 50 100 200
-40
-20
0
20
40
60
80
100
120
140
ResistanceꢀValueꢀ(mOhm)
Temperatureꢀ(°C)
Derating
120
0.5%
100
0.2%
80
0.1%
60
40
20
0
25
50
85
100
115
130
Temperature of the backplate (°C)
PowerꢀRatingꢀNotesꢀ-
TheꢀFPRꢀSeriesꢀResistorsꢀmustꢀbeꢀattachedꢀtoꢀaꢀsuitableꢀheat-
sink. The maximum internal resistor temperature is 130°C.
Toꢀspecifyꢀanꢀappropriateꢀheatsinkꢀuseꢀtheꢀfollowingꢀformulaꢀ:
RqHꢀ=ꢀTMAX - ( P x RqRꢀ)ꢀ-ꢀTA
ꢀꢀꢀꢀꢀꢀꢀꢀꢀP
Where:ꢀ RqHꢀ=ꢀThermalꢀResistanceꢀofꢀHeatsinkꢀ(ꢀK/Wꢀ)
ꢀ
ꢀ
ꢀ
ꢀ
RqRꢀ=ꢀThermalꢀResistanceꢀofꢀResistorꢀ(ꢀK/Wꢀ)
TMAX = Maximum Temperature of Resistor
TAꢀ=ꢀAmbientꢀTemperatureꢀofꢀHeatsinkꢀ(ꢀ°Cꢀ)
Pꢀ=ꢀPowerꢀThroughꢀResistorꢀ(ꢀWꢀ)
Riedon Inc.ꢀ
ꢀ
ꢀ
300ꢀCypressꢀAvenueꢀ
ꢀ
ꢀ
AlhambraꢀCAꢀ91801ꢀ
www.riedon.com
ꢀ(626)ꢀ284-9901ꢀ
ꢀ(626)ꢀ284-1704
Pageꢀ46
ꢀ
ꢀ
ꢀ
ꢀ
rev.ꢀ03/2006A
RIEDON [ RIEDON POWERTRON ]
