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CS52015-3GSTR3 Scheda tecnica(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS52015-3GSTR3 Scheda tecnica(HTML) 4 Page - Cherry Semiconductor Corporation |
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4 / 6 page  4 Applications Information The CS52015-3 linear regulator provides a 3.3V output voltage at currents up to 1.5A. The regulator is protected against overcurrent conditions and includes thermal shutdown. The CS52015-3 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 are based on cost, availabili- ty, size and temperature constraints. A tantalum or alu- minum 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 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 CS52015-3 the transient response and stability improve with higher val- ues of capacitance. The majority of applications for this regulator involve large changes in load current so the out- put 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 network 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 CS52015-3 linear regulator, the discharge path is through a large junction and protection diodes are not usu- ally needed. If the regulator is used with large values of output capacitance and the input voltage is instantaneous- ly shorted to ground, damage can occur. In this case, a diode connected as shown in Figure 1 is recommended. Figure 1: Protection diode scheme for large output capacitors. Since the CS52015-3 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. For best results the regulator should be connected as shown in Figure 2. Output Voltage Sensing VOUT VIN CS52015-3 VIN Gnd C1 VOUT C2 IN4002 (optional) Protection Diodes Stability Considerations Typical Performance Characteristics 02 3 4 5 6 750 7 -100 0 100 200 Time mS 10 9 8 1 1500 -200 0 COUT =CIN =22mF Tantalum Transient Response Load Regulation vs. Output Current 0.025 0.000 0.050 0.075 0.100 01 2 Output Current (A) T CASE = 0°C T CASE = 125°C T CASE = 25°C |
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