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BD3552HFN датащи(PDF) 11 Page - Rohm |
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BD3552HFN датащи(HTML) 11 Page - Rohm |
11 / 17 page 11/16 ●Recommended Circuit Example Component Recommended Value Programming Notes and Precautions R1/R2 3.9k/3.3k IC output voltage can be set with a configuration formula using the values for the internal reference output voltage (VFB)and the output voltage resistors (R1, R2). Select resistance values that will avoid the impact of the VREF current (±100nA). The recommended total resistance value is 10KΩ. C3 22μF To assure output voltage stability, please be certain the Vo1, Vo2, and Vo3 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. C1 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 1 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. C2 22μF 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 22 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. C4 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. C5 - This component is employed when the C3 capacitor causes, or may cause, oscillation. It provides more precise internal phase correction. R4 Several kΩ ~several 10kΩ It is recommended that a resistance (several kΩ to several 10kΩ) be put in R4, in case negative voltage is applied in EN pin. 1 2 3 4 8 7 6 5 VOUT1(1.2V) C3 R2 R1 FB C4 GND VCC C1 EN C2 VIN R4 C5 |
Аналогичный номер детали - BD3552HFN |
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Аналогичное описание - BD3552HFN |
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