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TS2938CS Arkusz danych(PDF) 5 Page - Taiwan Semiconductor Company, Ltd |
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TS2938CS Arkusz danych(HTML) 5 Page - Taiwan Semiconductor Company, Ltd |
5 / 7 page TS2938 500mA Ultra Low Dropout Voltage Regulator with Inhibit Function 5/7 Version: A07 Application Information (Continue) Thermal Characteristics A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. Under all possible operating conditions, the junction temperature must be within the range specified under absolute maximum ratings. To determine if the heatsink is required, the power dissipated by the regulator, PD must be calculated. The below formula shows the voltages and currents for calculating the PD in the regulator: IIN = IL / IG PD = (VIN-VOUT) * IL + (VIN) * IG Ex. PD = (3.3V-2.5V) * 0.5A + 3.3V * 11mA = 400mW + 36mW = 436mW The next parameter which must be calculated the maximum allowable temperature rise. TR(max) is calculated by the using to formula: TR(max) = TJ(max) – TA(max) Where: TJ(max) is the maximum allowable junction temperature, which is 125 oC for commercial grade parts. TA(max) is the maximum ambient temperature which will be encountered in the application. Using the calculated values for TA(max) and PD, the maximum allowable value for the junction to ambient thermal resistance, θJA, can now be found: θJA = TR(max) / PD Inhibit Input TS2938 feature an active-low (Inhibit) input that allows ON/OFF control of the regulator. The Inhibit input has TTL/CMOS compatible thresholds for simple interfacing with logic interfacing. Inhibit should be directly tied to Ground or keep open (not connected). |
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