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NCV8502DADJR2 Datasheet(PDF) 10 Page - ON Semiconductor |
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NCV8502DADJR2 Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 14 page NCV8502 Series http://onsemi.com 10 APPLICATION NOTES Figure 16. Additional Output Current NCV8502 VIN VOUT VADJ C2 0.1 mF VBAT 5.0 V MJD31C R1 294 k R2 100 k C1 47 mF >1 Amp Adding Capability Figure 16 shows how the adjustable version of parts can be used with an external pass transistor for additional current capability. The setup as shown will provide greater than 1 Amp of output current. FLAG MONITOR Figure 17 shows the FLAG Monitor waveforms as a result of the circuit depicted in Figure 14. As the output voltage falls (VOUT), the Monitor threshold is crossed. This causes the voltage on the FLAG output to go low sending a warning signal to the microprocessor that a RESET signal may occur in a short period of time. TWARNING is the time the microprocessor has to complete the function it is currently working on and get ready for the RESET shutdown signal. Figure 17. FLAG Monitor Circuit Waveform VOUT MON RESET FLAG Monitor Ref. Voltage TWARNING FLAG Figure 18. Test and Application Circuit Showing Output Compensation VIN VOUT COUT** 10 mF RRST RESET CIN* 0.1 mF NCV8502 *CIN required if regulator is located far from the power supply filter **COUT required for stability. Capacitor must operate at minimum temperature expected SETTING THE DELAY TIME The delay time is controlled by the Reset Delay Low Voltage, Delay Switching Threshold, and the Delay Charge Current. The delay follows the equation: tDELAY + [CDELAY(Vdt * Reset Delay Low Voltage)] Delay Charge Current Example: Using CDELAY = 33 nF. Assume reset Delay Low Voltage = 0. Use the typical value for Vdt = 1.8 V. Use the typical value for Delay Charge Current = 2.5 mA. tDELAY + [33 nF(1.8 * 0)] 2.5 mA + 23.8 ms 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 should be 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, but, if the circuit operates at low temperatures (−25 °C to −40°C), both the value and ESR of the capacitor will vary considerably. The capacitor manufacturers data sheet usually provides this information. The value for the output capacitor COUT shown in Figure 18 should work for most applications, however it is not necessarily the optimized solution. |
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