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BD3512MUV датащи(PDF) 11 Page - Rohm |
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BD3512MUV датащи(HTML) 11 Page - Rohm |
11 / 17 page 11/16 ●Recommended Circuit Example Component Recommended Value Programming Notes and Precautions R18/R19 3.3k/3.9k IC output voltage can be set with a configuration formula VFB×(R18+R19)/R19 using the values for the internal reference output voltage (VFB) and the output voltage resistors (R18, R19). Select resistance values that will avoid the impact of the FB bias current (±100nA). The recommended total resistance value is 10KΩ. R4 100k This is the pull-up resistance for open drain pin. It is recommended to set the value about 100kΩ. C16 22μF To assure output voltage stability, please be certain the Vo1~Vo5 pins and the GND pins are connected. Output capacitors play a role in loop gain phase compensation and in mitigating output fluctuation during rapid changes in load level. Insufficient capacitance may cause oscillation, while high equivalent series reisistance (ESR) will exacerbate output voltage fluctuation under rapid load change conditions. While a 22μF ceramic capacitor is recomended, actual stability is highly dependent on temperature and load conditions. Also, note that connecting different types of capacitors in series may result in insufficient total phase compensation, thus causing oscillation. In light of this information, please confirm operation across a variety of temperature and load conditions. C6/C5 1μF/0.1μF Input capacitors reduce the output impedance of the voltage supply source connected to the (VCC) input pins. If the impedance of this power supply were to increase, input voltage (VCC) could become unstable, leading to oscillation or lowered ripple rejection function. While a low-ESR 1μF / 0.1μF capacitor with minimal susceptibility to temperature is recommended, stability is highly dependent on the input power supply characteristics and the substrate wiring pattern. In light of this information, please confirm operation across a variety of temperature and load conditions. C9 10μF Input capacitors reduce the output impedance of the voltage supply source connected to the (VIN) input pins. If the impedance of this power supply were to increase, input voltage (VIN) could become unstable, leading to oscillation or lowered ripple rejection function. While a low-ESR 10 μ F capacitor with minimal susceptibility to temperature is recommended, stability is highly dependent on the input power supply characteristics and the substrate wiring pattern. In light of this information, please confirm operation across a variety of temperature and load conditions. C20 0.01μF The Non Rush Current on Startup (NRCS) function is built into the IC to prevent rush current from going through the load (VIN to VO) and impacting output capacitors at power supply start-up. Constant current comes from the NRCS pin when EN is HIGH or the UVLO function is deactivated. The temporary reference voltage is proportionate to time, due to the current charge of the NRCS pin capacitor, and output voltage start-up is proportionate to this reference voltage. Capacitors with low susceptibility to temperature are recommended, in order to assure a stable soft-start time. CFB 1000pF This component is employed when the C16 capacitor causes, or may cause, oscillation. It provides more precise internal phase correction. C16 C20 R19 R18 Vo (1.2V/3A) 16 17 18 19 20 1 2 3 4 5 15 14 13 12 11 10 9 8 7 6 C9 VIN C6 VCC VEN R4 VPGOOD VCC C5 CFB C2 C3 R9 R8 |
Аналогичный номер детали - BD3512MUV_08 |
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Аналогичное описание - BD3512MUV_08 |
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