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GM6605-ATA3T Datasheet(PDF) 5 Page - Gamma Microelectronics Inc. |
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GM6605-ATA3T Datasheet(HTML) 5 Page - Gamma Microelectronics Inc. |
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5 / 10 page  5 APPLICATION INFORMATION GM6605 series linear regulators provide fixed and ad- justable output voltages at currents up to 5.0A. These regulators are protected against over-current condi- tions and include thermal shutdown protection. The GM6605 has a composite PNP-NPN output transistor and require an output capacitor for stability. A detailed procedure for selecting this capacitor is as followed. Stability Considerations The output compensation capacitor helps to determine three main characteristics of a linear regulator's perfor- mance: 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 pre- ferred, as a film or ceramic capacitor with almost zero ESR can cause instability. An aluminum electrolytic ca- pacitor is the least expensive type. But when the circuit operates at low temperatures, both the value and ESR of the capacitor will vary widely. For optimum perfor- mance over the full operating temperature range, a tan- talum capacitor is the best. A 22µF tantalum capacitor will work fine in most applications. But with high current regulators, such as GM6605 higher capacitance values will improve the transient response and stability. Most applications for Gm6605 involve large changes in load current, so the output capacitor must supply instanta- neous load current. The ESR of the output capacitor causes an immediate drop in output voltage given by: In microprocessor applications an output capacitor net- work of several tantalum and ceramic capacitors in par- allel is commonly used. This reduces overall ESR and minimizes the instantaneous output voltage drop under transient load conditions. The output capacitor network should be placed as close to the load as possible for the best results. Protection Diodes When large external capacitors are used with most linear regulator, it is wise to add protection diodes. If the input voltage of the regulator is shorted, the out- put capacitor will discharge into the output of the reg- ulator. The discharge current depends on the value of capacitor, output voltage, and rate at which V IN drops. In GM6605 linear regulators, the discharge path is through a large junction, and protection diodes are normally not needed. However, if the regulator is used with large output capacitance values and the in- put voltage is instantaneously shorted to ground, damage can occur. In this case, a diode connected as shown above in Figure 1. DV = I x ESD D (a),(b) Figure 1 Protection Diode Scheme for Large Output Capacitors (a) Fixed Version (b) Adjustable Version V IN V OUT C ADJ GM6605-Adj ADJ V IN V OUT C1 C2 R1 R2 GM6605-3.3 GND V IN V OUT C1 IN4002 C2 V IN V OUT IN4002 |
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