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RT9164A-28PG Datasheet(PDF) 11 Page - Richtek Technology Corporation |
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RT9164A-28PG Datasheet(HTML) 11 Page - Richtek Technology Corporation |
11 / 14 page RT9164A 11 DS9164A-13 August 2007 www.richtek.com PD = (VIN - VOUT) x IOUT TJUNCTION = TAMBIENT + (PD x θJA) Note: TJUNCTION must not exceed 125°C Current Limit Protection RT9164A is protected against overload conditions. Current protection is triggered at typically 1.8A. Thermal Consideration The RT9164A series contain thermal limiting circuitry designed to protect itself from over-temperature conditions. Even for normal load conditions, maximum junction temperature ratings must not be exceeded. As mention in thermal protection section, we need to consider all sources of thermal resistance between junction and ambient. It includes junction-to-case, case-to-heat-sink interface, and heat sink thermal resistance itself. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. Proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. The case of all devices in this series is electrically connected to the output. Therefore, if the case of the device must be electrically isolated, a thermally conductive spacer is recommended. VIN VOUT ADJ RT9164A R1 R2 V IN Connect R2 to load (Connect R1 to VOUT or case) R L R P Parasitic Line Resistance Figure 6. Best Load Regulation Using Adjustable Output Regulator Thermal Protection RT9164A has thermal protection which limits junction temperature to 150 °C. However, device functionality is only guaranteed to a maximum junction temperature of +125 °C. The power dissipation and junction temperature for RT9164A are given by |
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