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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADP5600ACPZ-R7 датащи(PDF) 19 Page - Analog Devices |
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ADP5600ACPZ-R7 датащи(HTML) 19 Page - Analog Devices |
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19 / 25 page  Data Sheet ADP5600 Rev. 0 | Page 19 of 25 THERMAL CONSIDERATIONS If the ADP5600 junction temperature rises above 150°C, the internal thermal shutdown circuit turns off the oscillator, charge pump, and LDO for self protection. Extreme junction temperatures can be the result of high current operation, poor circuit board thermal design, and/or high ambient temperature. TSDHYS is included in the thermal shutdown circuit so that if an overtemper- ature event occurs, the ADP5600 does not return to normal operation until the on-chip temperature drops below 135°C. Upon recovery, both the charge pump and LDO soft starts are initiated before normal operation begins. The junction temperature of the ADP5600 can be calculated by TJ = TA + (PD × θJA) where: TA is the ambient temperature. θJA is the JEDEC thermal resistance. PD is the power dissipation in the die, given by PD = ((VIN – VLDO_OUT) × ILDO_OUT) + (VIN × ISW) where: VIN and VLDO_OUT are the input and output voltages, respectively. ILDO_OUT is the LDO load current. ISW is the active switching current. Figure 55 shows junction temperature calculations for different ambient temperatures and power dissipation. Figure 55. Junction Temperature vs. Total Power Dissipation at Various Ambient Temperatures 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 TOTAL POWER DISSIPATION (W) TA = 25°C TA = 50°C TA = 85°C |
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