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NCP565MN30T2G Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP565MN30T2G Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 17 page NCP565/NCV565 http://onsemi.com 8 APPLICATION INFORMATION The NCP565 low dropout linear regulator provides adjustable voltages at currents up to 1.5 A. It features ultra fast transient response and low dropout voltage. These devices contain output current limiting, short circuit protection and thermal shutdown protection. Input, Output Capacitor and Stability An input bypass capacitor is recommended to improve transient response or if the regulator is located more than a few inches from the power source. This will reduce the circuit’s sensitivity to the input line impedance at high frequencies and significantly enhance the output transient response. Different types and different sizes of input capacitors can be chosen dependent on the quality of power supply. A 150 mF OSCON 16SA150M type from Sanyo should be adequate for most applications. The bypass capacitor should be mounted with shortest possible lead or track length directly across the regulator’s input terminals. The output capacitor is required for stability. The NCP565 remains stable with ceramic, tantalum, and aluminum− electrolytic capacitors with a minimum value of 1.0 mF with ESR between 50 m W and 2.5 W. The NCP565 is optimized for use with a 150 mF OSCON 16SA150M type in parallel with a 10 mF OSCON 10SL10M type from Sanyo. The 10 mF capacitor is used for best AC stability while 150 mF capacitor is used for achieving excellent output transient response. The output capacitors should be placed as close as possible to the output pin of the device. If not, the excellent load transient response of NCP565 will be degraded. Adjustable Operation The typical application circuit for the adjustable output regulators is shown in Figure 2. The adjustable device develops and maintains the nominal 0.9 V reference voltage between Adj and ground pins. A resistor divider network R1 and R2 causes a fixed current to flow to ground. This current creates a voltage across R1 that adds to the 0.9 V across R2 and sets the overall output voltage. The output voltage is set according to the formula: Vout + Vref R1 ) R2 R2 * IAdj R2 The adjust pin current, IAdj, is typically 30 nA and normally much lower than the current flowing through R1 and R2, thus it generates a small output voltage error that can usually be ignored. Load Transient Measurement Large load current changes are always presented in microprocessor applications. Therefore good load transient performance is required for the power stage. NCP565 has the feature of ultra fast transient response. Its load transient responses in Figures 13 through 16 are tested on evaluation board shown in Figure 19. On the evaluation board, it consists of NCP565 regulator circuit with decoupling and filter capacitors and the pulse controlled current sink to obtain load current transitions. The load current transitions are measured by current probe. Because the signal from current probe has some time delay, it causes un−synchronization between the load current transition and output voltage response, which is shown in Figures 13 through 16. NCP565 Evaluation Board GEN GND V RL GND Scope Voltage Probe + + Pulse Figure 19. Schematic for Transient Response Measurement Vout −VCC Vin |
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