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TC1266 Scheda tecnica(PDF) 5 Page - Microchip Technology |
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TC1266 Scheda tecnica(HTML) 5 Page - Microchip Technology |
5 / 18 page 2001-2012 Microchip Technology Inc. DS21377C-page 5 TC1266 4.0 THERMAL CONSIDERATIONS 4.1 Thermal Shutdown Integrated thermal protection circuitry shuts the regulator off when die temperature exceeds 160°C. The regulator remains off until the die temperature drops to approximately 150°C. 4.2 Power Dissipation The amount of power the regulator dissipates is primarily a function of input and output voltage, and output current. The following equation is used to calculate worst case actual power dissipation: EQUATION 4-1: The maximum allowable power dissipation (Equation 4-2) is a function of the maximum ambient temperature (TAMAX), the maximum allowable die temperature (TJMAX) and the thermal resistance from junction-to-air ( JA). EQUATION 4-2: Equation 4-1 can be used in conjunction with Equation 4-2 to ensure regulator thermal operation is within limits. For example: Given: VINMAX = 5V ± 5% VOUTMIN = 3.217V ILOADMAX = 200mA TJMAX = 125°C TAMAX = 70°C JA = 130°C/W (SOIC) Find: 1. Actual power dissipation 2. Maximum allowable dissipation Actual power dissipation: PD (VINMAX – VOUTMIN)ILOADMAX = (5.25V - 3.217V) 200mA = 407mW Maximum allowable power dissipation: In this example, the TC1266 dissipates a maximum of 407mW; below the allowable limit of 423mW. Where: PD (VINMAX – VOUTMIN)ILOADMAX PD VINMAX VOUTMIN ILOADMAX = Worst case actual power dissipation = Minimum regulator output voltage = Maximum output (load) current = Maximum voltage on VIN PDMAX = (TJMAX – TAMAX) JA Where all terms are previously defined. PDMAX = (TJMAX – TAMAX) JA = (125 – 70) 130 = 423mW |
Codice articolo simile - TC1266_13 |
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Descrizione simile - TC1266_13 |
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