Datasheet NCP565, NCV565 (ON Semiconductor) - 10

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NCP565, NCV565 Table 1. Bill of Materials for NCP565 Adj Demonstration Board Item Used # Component Designators Suppliers Part Number
1 4 Radial Lead Aluminum Capacitor C1, C2, C3, C5 Sanyo Oscon 16SA150M 150 mF/16 V 2 1 Radial Lead Aluminum Capacitor C4 Sanyo Oscon 10SL10M 10 mF/10 V 3 1 SMT Chip Resistor (0805) 15.8 K 1% R2 Vishay CRCW08051582F 4 1 SMT Chip Resistor (0805) 42.2 K 1% R1 Vishay CRCW08054222F 5 1 SMT Ceramic Capacitor (0603) 5.6 pF 10% C6 Vishay VJ0603A5R6KXAA 6 1 NCP565 Low Dropout Linear Regulator U1 ON Semiconductor NCP565D2TR4
Protection Diodes Thermal Considerations
When large external capacitors are used with a linear This series contains an internal thermal limiting circuit regulator it is sometimes necessary to add protection diodes. that is designed to protect the regulator in the event that the If the input voltage of the regulator gets shorted, the output maximum junction temperature is exceeded. This feature capacitor will discharge into the output of the regulator. The provides protection from a catastrophic device failure due to discharge current depends on the value of the capacitor, the accidental overheating. It is not intended to be used as a output voltage and the rate at which Vin drops. In the substitute for proper heat sinking. The maximum device NCP565 linear regulator, the discharge path is through a power dissipation can be calculated by: large junction and protection diodes are not usually needed. TJ(max) * TA If the regulator is used with large values of output PD + R capacitance and the input voltage is instantaneously shorted qJA to ground, damage can occur. In this case, a diode connected as shown in Figure 24 is recommended. 200 180 DFN 1 oz Cu 1N4002 (Optional) 160 V DFN 2 oz Cu in Vout V 140 in Vout SOT−223 1 oz Cu
NCP565
CAdj 120 SOT−223 2 oz Cu C1 C2 (°C/W) GND Adj D2PAK 1 oz Cu R1 100 q JA D2PAK 2 oz Cu 80 R2 60 400 50 100 150 200 250 300 350 400 450 500
Figure 24. Protection Diode for Large
COPPER HEAT−SPREADER AREA (mm sq)
Output Capacitors Figure 25. Thermal Resistance www.onsemi.com 10