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CS5204-3 Datasheet(PDF) 6 Page - ON Semiconductor |
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CS5204-3 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 10 page CS5204−1, CS5204−3, CS5204−5 http://onsemi.com 6 The ESR of the output capacitor causes an immediate drop in output voltage given by: DV + DI ESR For microprocessor applications it is customary to use an output capacitor network consisting of several tantalum and ceramic capacitors in parallel. This reduces the overall ESR and reduces the instantaneous output voltage drop under load transient conditions. The output capacitor network should be as close as possible to the load for the best results. Protection Diodes When large external capacitors are used with a linear regulator it is sometimes necessary to add protection diodes. If the input voltage of the regulator gets shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage and the rate at which VIN drops. In the CS5204−x family of linear regulators, the discharge path is through a large junction and protection diodes are not usually needed. If the regulator is used with large values of output capacitance and the input voltage is instantaneously shorted to ground, damage can occur. In this case, a diode connected as shown in Figures 11 and 12 is recommended. Figure 11. Protection Diode Scheme for Adjustable Output Regulator C2 VOUT VIN C1 VIN VOUT Adj CS5204−1 IN4002 (optional) CAdj R1 R2 Figure 12. Protection Diode Scheme for Fixed Output Regulators C2 VOUT VIN C1 VIN VOUT GND CS5204−x IN4002 (optional) Output Voltage Sensing Since the CS5204−x is a three terminal regulator, it is not possible to provide true remote load sensing. Load regulation is limited by the resistance of the conductors connecting the regulator to the load. For best results the fixed regulators should be connected as shown in Figure 13. Figure 13. Conductor Parasitic Resistance can be Minimized with the Above Grounding Scheme for Fixed Output Regulators VIN VIN VOUT GND CS5204−x Conductor Parasitic Resistance RC RLOAD For the adjustable regulator, the best load regulation occurs when R1 is connected directly to the output pin of the regulator as shown in Figure 14. If R1 is connected to the load, RC is multiplied by the divider ratio and the effective resistance between the regulator and the load becomes RC R1 ) R2 R1 where RC = conductor parasitic resistance. Figure 14. Grounding Scheme for Adjustable Output Regulator to Minimize Parasitics VIN VIN VOUT Adj CS5204−1 Conductor Parasitic Resistance R1 RLOAD R2 RC |
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Descripción similar - CS5204-3 |
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