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TS19601CP5RO Datasheet(PDF) 6 Page - Taiwan Semiconductor Company, Ltd |
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TS19601CP5RO Datasheet(HTML) 6 Page - Taiwan Semiconductor Company, Ltd |
6 / 8 page TS19601 700mA High Voltage Adjustable Current Regulator With Enable Control 6/8 Version: C14 Thermal Consideration Information The Maximum Power Dissipation on Current Regulator PD(MAX) = VOUT(MAX) × IOUT(NOM) + VIN(MAX) × IDD Where : VOUT(MAX) = the maximum voltage on output pin; IOUT(NOM) = the nominal output current; IDD = the quiescent current the regulator consumes at IOUT(NOM); VIN(MAX) = the maximum input voltage. Thermal Consideration The TS19601 has internal power and thermal limiting circuitry designed to protect the device under overload conditions. However, maximum junction temperature ratings should not be exceeded under continuous normal load conditions. The thermal protection circuit of TS19601 prevents the device from damage due to excessive power dissipation. When the device junction temperature rises to approximately 150°C, the regulator will be turned off. When power consumption is over about 1000mW (TO-252 package, at TA=70°C), additional heat sink is required to control the junction temperature below 125°C. The junction temperature is: TJ = PD (RθJT + RθCS + RθSA ) + TA Where : PD : Dissipated power. RθJT: Thermal resistance from the junction to the mounting tab of the package. For TO-252 package, RθJT = 7.0°C/W. RθCS: Thermal resistance through the interface between the IC and the surface on which it is mounted. (typically, RθCS < 1.0°C /W) RθSA: Thermal resistance from the mounting surface to ambient (thermal resistance of the heat sink). If PC Board copper is going to be used as a heat sink, below table can be used to determine the appropriate size of copper foil required. For multi-layered PCB, these layers can also be used as a heat sink. They can be connected with several through-holes via. PCB RθJA ºC/W 59 45 38 33 27 24 21 PCB heat sink size 500 1000 1500 2000 3000 4000 5000 |
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