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TS1583CZ53.3 Folha de dados(PDF) 4 Page - Taiwan Semiconductor Company, Ltd |
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TS1583CZ53.3 Folha de dados(HTML) 4 Page - Taiwan Semiconductor Company, Ltd |
4 / 7 page TS1583 series 4-4 2003/12 rev. A Application Information Application The TS1583 is a low dropout regulator designed to make used of multiple power supplies, present in most systems, to reduce the dropout voltage. One of the advantages of the two supply approach is maximizing the efficiency. The second supply is at least 1V greater than output voltage and is providing the power for the control circuitry and supplies the drive current to the NPN output transistor. This allows the NPN output transistor to be driven into saturation. For the control voltage the current requirement is small equal to about 1% of the output current or approximately 50mA for a 1.5A load. This drive current becomes part of the output current. The maximum voltage on the Control Pin is 15V. The maximum voltage at the Power in is 7V. By tying the control and power inputs together the TS1583 can also be operated as a single supply device. In single supply operation the dropout will be determined by the minimum control voltage. Both the fixed and adjustable versions have remote sense pins, permitting very accurate regulation of output voltage. As a result, over and output current range of 100mA to 1.5A, the typical load regulation is less than 1mV. For the fixed voltages the adjust pin is brought out allowing the user to improve transient response by bypassing the internal resistor divider. Optimum transient response is provided using a capacitor in the range of 0.1uF to 1uF for bypassing the adjust pin. The new generation of microprocessors cycle load current from several hundred million amperes to several amperes in tens of nanoseconds. Output voltage tolerances are tighter and include transient response as part of the specification. Designed to meet the fast current load step requirements of these microprocessors, the TS1583 also saves total cost by needing less output capacitance to maintain regulation. Typical applications for the TS1583 include 3.3V to 2.5V conversion with a 5V control supply, 5V to 4.2V conversion with a 12V control supply or 5V to 3.6V conversion with a 12V control supply. It is easy to obtain dropout voltages less than 0.5V at 0.8A along with excellent static and dynamic specifications. It is fully protected against over current and over temperature conditions. Grounding and Output Sensing The TS1583 allows true Kelvin sensing for both the high & low side of the load. A result the voltage regulation at the load can be easily optimized. Voltage drops due to parasitic resistances between the regulator and the load can be placed inside the regulation loop. The advantages of remote sensing are illustrated in Figure 1 through 3. Figure 1 show the device connected as a conventional 3 terminal regulator with the Sense lead connected directly to the output of the device. Rp is the parasitic resistance of the connections between the device and the load. Trace A of Figure 3 illustrates the effect of Rp Figure 1. Conventional Load Sensing Figure 2 show the device connected to take advantage of the remote sense feature. The Sense Pin and the top of the resistor divider are connected to the top of the load; the bottom of the resistor divider is connected to the bottom of the load. Figure 2. Remote Load Sensing |
Nº de peça semelhante - TS1583CZ53.3 |
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Descrição semelhante - TS1583CZ53.3 |
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