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NCP631 Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP631 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 9 page NCP631 http://onsemi.com 7 Reverse Current Some situations might occur were the output pin is raised to a voltage while the input pin is at zero volts. This situation will not damage the device. If the output voltage is raised to a higher voltage than the input voltage a diode is recommended from output to input with the anode connect to the output pin. Thermal Considerations This series contains an internal thermal limiting circuit that is designed to protect the regulator in the event that the maximum junction temperature is exceeded. When activated, typically at 155 °C, the regulator output switches off and then back on as the die cools. As a result, if the device is continuously operated in an overheated condition, the output will appear to be oscillating. This feature provides protection from a catastrophic device failure due to accidental overheating. It is not intended to be used as a substitute for proper heatsinking. The maximum device power dissipation can be calculated by: PD + TJ(max) * TA R qJA (eq. 7) The devices are available in surface mount D2PAK package. The package has an exposed metal tab that is specifically designed to reduce the junction to air thermal resistance, RqJA, by utilizing the printed circuit board copper as a heat dissipater. Figure 13 shows typical RqJA values that can be obtained from a square pattern using economical single sided 2.0 ounce copper board material. The final product thermal limits should be tested and quantified in order to insure acceptable performance and reliability. The actual RqJA can vary considerably from the graphs shown. This will be due to any changes made in the copper aspect ratio of the final layout, adjacent heat sources, and air flow. TAPE AND REEL SPECIFICATION SOP Description Leads Package Length Package Width Package Thickness Reel Quantity Tape Pitch Tape Width Vendor P/N D2PAK 5 9.2 mm 10 mm 4.4 mm 800 16 mm 24 mm DDPAK−B |
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