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TS29102CS2.5 データシート(PDF) 6 Page - Taiwan Semiconductor Company, Ltd |
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TS29102CS2.5 データシート(HTML) 6 Page - Taiwan Semiconductor Company, Ltd |
6 / 8 page TS29100/1/2 6-6 2003/12 rev. A Application Information Application Information The TS29100/1/2 series are high performance with low dropout voltage regulator suitable for moderate to high current and voltage regulator application. Its 4000mA(typ) dropout voltage at full load and over temperature makes it especially valuable in battery power systems and as high efficiency noise filters in post regulator applications. Unlike normal NPN transistor design, where the base to emitter voltage drop and collector to emitter saturation voltage limit the minimum dropout voltage, dropout performance of the PNP output of these devices is limited only by low Vce saturation voltage. The TS29100/1/2 series is fully protected from damage due to fault conditions. Linear current limiting is provided. Output current during overload conditions is constant. Thermal shutdown the device when the die temperature exceeds the maximum safe operating temperature. Transient protection allows device survival even when the input voltage spikes above and below nominal. The output structure of these regulators allows voltages in excess of the desired output voltage to be applied without reverse current flow. Capacitor Requirement The TS29100/1/2 series requires an output capacitor to maintain stability and improve transient response is necessary. The value of this capacitor is dependent upon the output current, lower currents allow smaller capacitors. TS29100/1/2 series regulators are stable with the 10uF minimum capacitor value at full load. Where the regulator is powered from a source with high AC impedance, a 0.1uF capacitor connected between input and ground is recommended. The capacitor should have good characteristics to above 250KHz. The capacitance values will be help to improved transient response, ripple rejection and output noise. Minimum Load Current The TS29100/1/2 series is specified between finite loads. If the output current is too small leakage currents dominate and the output voltage rises. A 10mA minimum load current swamps any expected leakage current across the operating temperature range. Adjustable Regulator Design The adjustable regulator versions (TS29102) 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 TS29101 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 TS29101 and TS29102 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. |
同様の部品番号 - TS29102CS2.5 |
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同様の説明 - TS29102CS2.5 |
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