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240D10 Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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9 / 12 page Form 859-990514 SOLID-STATE RELAYS DATA SHEET page 9/12 Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: (909)695-3000 • (800)321-OPTO • Fax: (909)695-3095 • Internet: www.opto22.com Inside Sales:(800)452-OPTO •Product Support: (800)TEK-OPTO•(909)695-3080•Fax:(909)695-3017 •E-mail:support@opto22.com•FaxBack:(800)474-OPTO Heat Sink Calculation Like all semiconductor devices, SSR current ratings must be based on maximum junction temperature. All Opto 22 SSRs operate conservatively at maximum junction temperatures of 110° C. Determining an adequate heat sink for a given SSR conducting a given current is very simple. Note: Thermally conductive grease must be used between the relay base and the heat sink. Sample Calculation Given: 120-Volt, 20-Amp Load 50° C Ambient Air ChooseModel120D25SSR. Calculate dissipation as: 20 amps x 1.3 Watts per amp = 26 Watts Calculate temperature rise junction to SSR base as: 26 Watts x 1.2° C per Watt = 31.2° C Calculateallowabletemperatureofheatsinkbysubtracting31.2°Cfrom110°Callowablejunctiontemperature: 110° C-31.2 = 78.8° C The heat sink is in a 50°C ambient, therefore, allowable temperature rise on heat sink is: 78.8° C-50° C = 28.8° C If heat sink is allowed to rise 28.8° C above ambient, then the thermal resistance of the heat sink is simply the 28.8° C risedivided by the 26 Watt. Any heat sink having a thermal resistance less than 1.1° C per Watt will be adequate. Duty Cycle Calculation When solid-state relays are operated in an on/off mode, it may be advantageous to calculate the RMS value of the current through the SSR for heat sinking or determining the proper current rating of the SSR for the given application. I RMS = RMS value of load or SSR T 1 = Time current is on T 2 = Time current is off I ON = RMS value of load current during on period I RMS = (I ON) 2 x T 1 T 1 + T2 Tips Applications |
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