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NCV8501 Datasheet(PDF) 11 Page - ON Semiconductor |
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NCV8501 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 16 page NCV8501 Series http://onsemi.com 11 APPLICATION NOTES Figure 18. Additional Output Current NCV8501 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 18 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 19 shows the FLAG Monitor waveforms as a result of the circuit depicted in Figure 16. 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 19. FLAG Monitor Circuit Waveform VOUT MON RESET FLAG Monitor Ref. Voltage TWARNING FLAG Figure 20. Test and Application Circuit Showing Output Compensation VIN VOUT COUT** 10 mF RRST RESET CIN* 0.1 mF NCV8501 *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. The value for the output capacitor COUT shown in Figure 20 should work for most applications, however it is not necessarily the optimized solution. |
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