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TS29150CZ 데이터시트(PDF) 6 Page - Taiwan Semiconductor Company, Ltd |
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TS29150CZ 데이터시트(HTML) 6 Page - Taiwan Semiconductor Company, Ltd |
6 / 11 page TS29150/1/2/3 1.5A Ultra Low Dropout Voltage Regulator with Multi-Function 6/11 Version: A07 Thermal Characteristics (Continue) The next parameter which must be calculated is the maximum allowable temperature rise, TR(max). this 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 TR(max) and PD, the maximum allowable value for the junction to ambient thermal resistance, θJA, can now be found: θJA = TR(max) / PD Adjustable Regulator Design The adjustable regulator versions (TS29152/53) is allow to programming the output voltage anywhere between 1.25 and the 26V maximum operating rating of the family. Two resistors are used. Resistors can be quite large up to 1MΩ, because of the very high input impedance and low bias current of the sense comparator, the resistor values are calculated by: R1 = R2 * [(VOUT / 1.24) – 1] Where is Vout the desired output voltage. Above application circuit shows component definition. Applications with widely varying load currents may scale the resistors to draw the minimum load current required for proper operation. Error Flag TS29151 and TS29153 versions feature an Error Flag, which looks at the output voltage and signals an error condition when this voltage drops 5% below its expected value. The error flag is an open-collector output that pulls low under fault conditions. It may sink 10mA. Low output voltage signifies a number of possible problems, including an over-current fault (the device is in current limit) and low input voltage. The flag output is inoperative during over temperature shutdown conditions. Enable Input TS29151 and TS29152 versions feature an enable (EN) input that allows ON/OFF control of the device. Special design allows “zero” current drain when the device is disabled–only microamperes of leakage current flow. The EN input has TTL/CMOS compatible thresholds for simple interfacing with logic, or may be directly tied to ≤30V. Enabling the regulator requires approximately 20uA of current. |
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