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NCP511SN50T1 Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP511SN50T1 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 11 page NCP511 http://onsemi.com 8 APPLICATIONS INFORMATION A typical application circuit for the NCP511 series is shown in Figure 16. Input Decoupling (C1) A 1.0 mF capacitor either ceramic or tantalum is recommended and should be connected close to the NCP511 package. Higher values and lower ESR will improve the overall line transient response. Output Decoupling (C2) The NCP511 is a stable Regulator and does not require any specific Equivalent Series Resistance (ESR) or a minimum output current. Capacitors exhibiting ESRs ranging from a few m W up to 3.0 W can thus safely be used. The minimum decoupling value is 1.0 mF and can be augmented to fulfill stringent load transient requirements. The regulator accepts ceramic chip capacitors as well as tantalum devices. Larger values improve noise rejection and load regulation transient response. Enable Operation The enable pin will turn on or off the regulator. These limits of threshold are covered in the electrical specification section of this data sheet. If the enable is not used then the pin should be connected to Vin. Hints Please be sure the Vin and GND lines are sufficiently wide. When the impedance of these lines is high, there is a chance to pick up noise or cause the regulator to malfunction. Set external components, especially the output capacitor, as close as possible to the circuit, and make leads a short as possible. Thermal As power across the NCP511 increases, it might become necessary to provide some thermal relief. The maximum power dissipation supported by the device is dependent upon board design and layout. Mounting pad configuration on the PCB, the board material and also the ambient temperature effect the rate of temperature rise for the part. This is stating that when the NCP511 has good thermal conductivity through the PCB, the junction temperature will be relatively low with high power dissipation applications. The maximum dissipation the package can handle is given by: PD + TJ(max) *TA R qJA If junction temperature is not allowed above the maximum 125 °C, then the NCP511 can dissipate up to 400 mW @ 25 °C. The power dissipated by the NCP511 can be calculated from the following equation: Ptot + [Vin *Ignd (Iout)] ) [Vin * Vout] *Iout or VinMAX + Ptot ) Vout * Iout Ignd ) Iout If a 150 mA output current is needed then the ground current from the data sheet is 40 mA. For an NCP511SN30T1 (3.0 V), the maximum input voltage will then be 5.6 V. Figure 16. Typical Application Circuit Vout Battery or Unregulated Voltage C1 C2 OFF ON 1 2 3 5 4 + + 1 10 0.1 0.01 100 IO, OUTPUT CURRENT (mA) Figure 17. Output Capacitor vs. Output Current 0150 25 50 75 100 125 Cout = 1 mF to 10 mF TA = 25°C to 125°C Vin = up to 6.0 V UNSTABLE STABLE |
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