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NCP600 데이터시트(PDF) 12 Page - ON Semiconductor |
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NCP600 데이터시트(HTML) 12 Page - ON Semiconductor |
12 / 13 page NCP600 http://onsemi.com 12 Noise Decoupling The NCP600 is a low noise regulator and needs no external noise reduction capacitor. Unlike other low noise regulators which require an external capacitor and have slow startup times, the NCP600 operates without a noise reduction capacitor, has a typical 15 ms start up delay and achieves a 50 mVrms overall noise level between 10 Hz and 100 kHz. Enable Operation The enable pin will turn the regulator on or off. The threshold limits are covered in the electrical characteristics table in this data sheet. The turn−on/turn−off transient voltage being supplied to the enable pin should exceed a slew rate of 10 mV/ ms to ensure correct operation. If the enable function is not to be used then the pin should be connected to Vin. Output Voltage Adjust The output voltage can be adjusted from 1 times (Figure 2) to 4 times (Figure 3) the typical 1.250 V regulation voltage via the use of resistors between the output and the ADJ input. The output voltage and resistors are chosen using Equation 1 and Equation 2. VOUT + 1.250 1 ) R1 R2 ) (IADJ R2) (eq. 1) R1 + R2 * [Vout * (IADJ *R2)] 1.25 * 1 ^ R2 Vout 1.25 * 1 (eq. 2) Input bias current IADJ is typically less than 150 nA. Choose R2 arbitrarily t minimize errors due to the bias current and to minimize noise contribution to the output voltage. Use Equation 2 to find the required value for R1. Thermal As power in the NCP600 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 the ambient temperature affect the rate of junction temperature rise for the part. When the NCP600 has good thermal conductivity through the PCB, the junction temperature will be relatively low with high power applications. The maximum dissipation the NCP600 can handle is given by: PD(MAX) + TJ(MAX) * TA R qJA (eq. 3) Since TJ is not recommended to exceed 125_C (TJ(MAX)), then the NCP600 can dissipate up to 400 mW when the ambient temperature (TA) is 25_C. The power dissipated by the NCP600 can be calculated from the following equations: PD [ VIN(IGND@IOUT) ) IOUT(VIN * VOUT) (eq. 4) or VIN(MAX) [ PD(MAX) ) (VOUT IOUT) IOUT ) IGND (eq. 5) If a 150 mA output current is needed, the quiescent current IGND is taken from the data sheet electrical characteristics table or extracted from Figure TBD and Figure TBD. IGND is approximately 108 mA when Iout = 150 mA. For an output voltage of 1.250 V, the maximum input voltage will then be 3.9 V, good for a 1 Cell Li−ion battery. Hints Vin and GND printed circuit board traces should be as wide as possible. When the impedance of these traces is high, there is a chance to pick up noise or cause the regulator to malfunction. Place external components, especially the output capacitor, as close as possible to the NCP600, and make traces as short as possible. DEVICE ORDERING INFORMATION Device Marking Code Version Package Shipping* NCP600SNADJT1G LIO ADJ TSOP−5 (Pb−Free) 3000/Tape & Reel NCP600SN150T1G LID 1.5 V NCP600SN180T1G LIE 1.8 V NCP600SN280T1G LIH 2.8 V NCP600SN300T1G LIJ 3.0 V NCP600SN330T1G LIK 3.3 V NCP600SN500T1G LIN 5.0 V *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. |
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