Datasheet LNK3202, LNK3204-7, LNK3294, LNK3296 (Power Integrations) - 10

LinkSwitch-TN2 Quick Design Checklist
4. Thermal Check – At maximum output power, minimum input voltage and maximum ambient temperature, verify that the As with any power supply design, al LinkSwitch-TN2 designs should LinkSwitch-TN2 SOURCE pin temperature is 100 °C or below. be verified for proper functionality on the bench. The fol owing This ensures adequate margin due to variations in R from minimum tests are recommended: DS(ON) part to part. If the device temperature of the IC exceeds 85 °C 1. Adequate DC Rail Voltage – Check that the minimum DC input with ambient temperature of 25 °C, it is recommended the next voltage does not fall below 70 VDC at maximum load, minimum bigger device in the family should be selected for the application. input voltage. A battery powered thermocouple meter is recommended to make 2. Correct Diode Selection – UF400x series diodes with reverse measurements when the SOURCE pins are a switching node. recovery time of 75 ns or better are recommended only for Alternatively, the ambient temperature may be raised to indicate designs that operate in MDCM at an ambient of 70 °C or below. margin to thermal shutdown. For designs operating in continuous conduction mode (CCM) and/ In a LinkSwitch-TN2 design using a buck or buck-boost converter or higher ambients, then a diode with a reverse recovery time of topology, the SOURCE pin is a switching node. Oscilloscope measure- 35 ns or better, such as the BYV26C, is recommended. ments should therefore be made with probe grounded to a DC voltage, 3. Maximum Drain Current – Verify that the peak drain current is such as primary return or DC input rail, and not to the SOURCE pins. below the data sheet peak drain specification under worst-case The power supply input must always be supplied from an isolated conditions of highest line voltage, maximum overload (just prior source when doing measurements (e.g. via an isolation transformer). to auto-restart) and highest ambient temperature.
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Rev. M 10/20 www.power.com Document Outline Product Highlights Description Output Current Table Pin Functional Description LinkSwitch-TN2 Functional Description Applications Example Key Application Considerations Quick Design Checklist Absolute Maximum Ratings Thermal Resistance Key Electrical Characteristics Typical Performance Characteristics PDIP-8C (P Package) SMD-8C (G Package) SO-8C (D Package) PDIP-8C (P) and SMD-8C Package Marking SO-8C (D) Package Marking MSL Table ESD and Latch-Up Part Ordering Information