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CS5205-2GDP3 데이터시트(PDF) 4 Page - ON Semiconductor |
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CS5205-2GDP3 데이터시트(HTML) 4 Page - ON Semiconductor |
4 / 8 page CS5205−2 http://onsemi.com 4 APPLICATIONS INFORMATION The regulator is protected against short circuit, and includes thermal shutdown and safe area protection (SOA) circuitry. The SOA protection circuitry decreases the maximum available output current as the input−output differential voltage increase. The CS5205−2 has a composite PNP−NPN output transistor and requires an output capacitor for stability. A detailed procedure for selecting this capacitor is included in the Stability Considerations section. Stability Considerations The output or compensation capacitor helps determine three main characteristics of a linear regulator: start−up delay, load transient response, and loop stability. The capacitor value and type is based on cost, availability, size and temperature constraints. A tantalum or aluminum electrolytic capacitor is best, since a film or ceramic capacitor with almost zero ESR can cause instability. The aluminum electrolytic capacitor is the least expensive solution. However, when the circuit operates at low temperatures, both the value and ESR of the capacitor will vary considerably. The capacitor manufacturer’s data sheet provides this information. A 22 mF tantalum capacitor will work for most applications, but with high current regulators such as the CS5205−2 the transient response and stability improve with higher values of capacitance. The majority of applications for this regulator involve large changes in load current so the output capacitor must supply the instantaneous load current. 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 transient load conditions. The output capacitor network should be as close to the load as possible 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 CS5205−2 linear regulator, 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 Figure 7 is recommended. Figure 7. Protection Diode Scheme for Fixed Output Regulators VIN CS5205−2 VOUT GND VOUT VIN C1 C2 IN4002 (Optional) Output Voltage Sensing Since the CS5205−2 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 regulator should be connected as shown in Figure 8. Figure 8. Conductor Parasitic Resistance Effects Can Be Minimized With the Above Grounding Scheme for Fixed Output Regulators VIN VIN VOUT CS5205−2 Conductor Parasitic Resistance RLOAD RC |
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