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NCV8503PW33G Datasheet(PDF) 10 Page - ON Semiconductor |
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NCV8503PW33G Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 13 page NCV8503 Series http://onsemi.com 10 Voltage Adjust Figure 19 shows the device setup for a user configurable output voltage. The feedback to the VADJ pin is taken from a voltage divider referenced to the output voltage. The loop is balanced around the Unity Gain threshold (1.30 V typical). JEDEC standard JESD78 requires −100 mA trigger test conditions. VADJ conforms to −75 mA test conditions. Figure 19. Adjustable Output Voltage VOUT VADJ NCV8503 15 k 5.1 k COUT ≈5.0 V 1.28 V APPLICATION NOTES FLAG MONITOR Figure 20 shows the FLAG Monitor waveforms as a result of the circuit depicted in Figure 18. As the input voltage falls (VMON), the Monitor threshold is crossed. This causes the voltage on the FLAG output to go low. Figure 20. FLAG Monitor Circuit Waveform VMON MON Flag Monitor Ref. Voltage FLAG 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 (2.5 V, 3.3 V, and 5.0 V options). Use the typical value for Delay Charge Current = 4.2 mA. tDELAY + [33 nF(1.8 * 0)] 4.2 mA + 14 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 21 should work for most applications, however it is not necessarily the optimized solution. Figure 21. Test and Application Circuit Showing Output Compensation VIN VOUT COUT** 33 mF RRST RESET CIN* 0.1 mF NCV8503 *CIN required if regulator is located far from the power supply filter **COUT required for stability. Capacitor must operate at minimum temperature expected |
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