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NCP565D2T33G Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP565D2T33G Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 16 page NCP565/NCV565 http://onsemi.com 11 Protection Diodes When large external capacitors are used with a linear regulator it is sometimes necessary to add protection diodes. If the input voltage of the regulator gets shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage and the rate at which Vin drops. In the NCP565 linear regulator, the discharge path is through a large junction and protection diodes are not usually needed. If the regulator is used with large values of output capacitance and the input voltage is instantaneously shorted to ground, damage can occur. In this case, a diode connected as shown in Figure 23 is recommended. Vin Vout NCP565 GND Adj C1 CAdj R1 R2 1N4002 (Optional) C2 Vout Figure 23. Protection Diode for Large Output Capacitors Vin 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. 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 heat sinking. The maximum device power dissipation can be calculated by: PD + TJ(max) * TA R qJA Figure 24. Thermal Resistance 0 50 100 150 200 250 300 350 400 450 500 40 60 80 100 120 140 160 180 COPPER HEAT−SPREADER AREA (mm sq) 200 DFN 1 oz Cu DFN 2 oz Cu SOT−223 1 oz Cu SOT−223 2 oz Cu D2PAK 1 oz Cu D2PAK 2 oz Cu |
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