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LDK715PU42R Datasheet(PDF) 7 Page - STMicroelectronics |
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LDK715PU42R Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 18 page DocID026678 Rev 1 7/18 LDK715 Electrical characteristics 18 4.1 External capacitor requirements A 0.1 µF or a larger input bypass capacitor, connected between IN and GND and located close to the device, is recommended. In this manner, the transient response and noise rejection of the power supply, as a whole, improve. A higher value of the input capacitor may be necessary if large, fast-rise-time load transients are present in the application and if the device is several inches far from the power source. The LDK715 requires an output capacitor connected between OUT and GND to stabilize the internal control loop. Please refer to Figure 7. for the allowable output capacitance and ESR combinations. 4.2 Power dissipation and junction temperature For a reliable operation, junction temperature should not exceed 125 °C. This limits the power dissipation the regulator can handle in any application. To guarantee that the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the dissipation, PD, which must be less than or equal to PD(max). The maximum power dissipation limit is given by the following equation: Equation 1 where: TJMAX is the maximum allowable junction temperature RthJA is the thermal resistance junction-to-ambient for the package TA is the ambient temperature The regulator dissipation is calculated by the following equation: Equation 2 Power dissipation coming from quiescent current is negligible. The ST715 features the internal current limit. During normal operation, it limits the output current to approximately 350 mA. When the current limit engages, the output voltage scales back linearly until the overcurrent condition ends. Do not exceed the power dissipation ratings of the package. P Dmax () T JMAX T A – () R thJA ⁄ = P D V IN V out – () I out × = |
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