Datenblatt-Suchmaschine für elektronische Bauteile |
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CS5207-3GDP3 Datenblatt(PDF) 3 Page - Cherry Semiconductor Corporation |
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CS5207-3GDP3 Datenblatt(HTML) 3 Page - Cherry Semiconductor Corporation |
3 / 5 page 0.025 0.000 0.050 0.075 0.100 0.200 01 2 3 4 5 Output Current (A) TCASE = 0°C 67 0.125 0.150 0.175 TCASE = 125°C TCASE = 25°C 3 Load Regulation vs. Output Current 0.0 101 Frequency (Hz) 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 102 103 104 105 TCASE = 25°C IOUT = 7A (VIN Ð VOUT) = 3V VRIPPLE = 1.6VPP Ripple Rejection vs. Frequency Typical Performance Characteristics: continued The CS5207-3 linear regulator provides a fixed 3.3V out- put at currents up to 7A. 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 increases. The CS5207-3 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. 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 capaci- tor with almost zero ESR can cause instability. The alu- minum electrolytic capacitor is the least expensive solu- tion. However, when the circuit operates at low tempera- tures, both the value and ESR of the capacitor will vary considerably. The capacitor manufacturersÕ data sheet pro- vides this information. A 22µF tantalum capacitor will work for most applications, but with high current regulators such as the CS5207-3 the transient response and stability improve with higher val- ues of capacitor. The majority of applications for this regu- lator 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: ÆV = ÆI ´ 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 net- work should be as close as possible to the load for the best results. When large external capacitors are used with a linear regu- lator 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 capaci- tor, the output voltage and the rate at which VIN drops. In the CS5207-3 regulator, the discharge path is through a large junction and protection diodes are not usually need- ed. If the regulator is used with large values of output capacitance and the input voltage is instantaneously short- ed to ground, damage can occur. In this case, a diode con- nected as shown in Figure 1 is recommended. Figure 1. Protection diode scheme for fixed output regulator. Since the CS5207-3 is a three terminal regulator, it is not possible to provide true remote load sensing. Load regula- tion is limited by the resistance of the conductors connect- ing the regulator to the load. Best load regulation occurs when the regulator is connect- ed to the load as shown in Figure 2. Output Voltage Sensing VOUT VIN CS5207-3 VIN Gnd C1 VOUT C2 IN4002 (optional) Protection Diodes Stability Considerations Applications Information |
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Ähnliche Beschreibung - CS5207-3GDP3 |
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