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NCP51460SN33T1G Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP51460SN33T1G Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 11 page NCP51460 http://onsemi.com 8 APPLICATIONS INFORMATION Input Decoupling Capacitor (CIN) It is recommended to connect a 0.1 mF Ceramic capacitor between VIN and GND pin of the device. This capacitor will provide a low impedance path for unwanted AC signals or noise present on the input voltage. The input capacitor will also limit the influence of input trace inductances and Power Supply resistance during sudden load current changes. Higher capacitances will improve the Power Supply Rejection Ratio and line transient response. Output Decoupling Capacitor (COUT) The NCP51460 was designed to be stable without an additional output capacitor. Without the output capacitor the VOUT settling times during Reference Turn−on or Turn−off can be as short as 20 ms (Refer to Figure 24 and 25). The Load Transient Responses without COUT (Figure 21 and 22) show good stability of NCP51460 even for fast output current changes from 0 mA to full load. If smaller VOUT deviations during load current changes are required, it is possible to add some external capacitance as shown on Figure 26. NCP51460 GND 3.3 V CIN 0.1 mF VIN = 4.2 to 28 V VIN VOUT VOUT COUT (3.3 V fixed) Figure 26. Output Capacitor Connection The COUT will reduce the overshoot and undershoot but will increase the settling time and can introduce some ringing of the output voltage during fast load transients. NCP51460 behavior for different values of ceramic X7R output capacitors is depicted on Figure 23. The Output Voltage ringing and settling times can be reduced by using some additional resistance in series with the Ceramic Capacitor or by using Tantalum or Aluminum Capacitors which have higher ESR values. Figure 27 below shows the Load Transient improvement after adding an additional 2 W series resistor to a 1 mF Ceramics Capacitor. 3.35 3.30 3.25 3.35 3.30 3.25 Figure 27. COUT = 1 mF MLCC + 2 W VIN = 5.8 V, TA = 25°C, trise_fall = 10 mA/1 ms VOUT IOUT = 10 mA IOUT = 0 mA COUT = 1 mF MLCC TIME (50 ms/DIV) The device was determined to be stable with Aluminum, Ceramic and Tantalum Capacitors with capacitances ranging from 0 to 100 mF at TA = 25°C. Turn−On Response It is possible to achieve very fast Turn−On time when fast VIN ramp is applied to NCP51460 input as shown on Figure 24. However if the Input Voltage change from 0 V to nominal Input Voltage is extremely fast, the Output Voltage settling time will increase. Figure 28 below shows this effect when the Input Voltage change is 5.8 V / 2 ms. 0 1 2 3 0 2 4 6 TIME (10 ms/DIV) Figure 28. VIN = 0 V to 5.8 V, CIN = 0 mF, COUT = 0 mF, IOUT = 0 mA, TA = 25°C, trise = 45 ms VOUT VIN |
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