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BD9015KV-M Fiches technique(PDF) 14 Page - Rohm |
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BD9015KV-M Fiches technique(HTML) 14 Page - Rohm |
14 / 31 page Datasheet Datasheet 14/27 BD9015KV-M BD9016KV-M TSZ02201-0T1T0PB00040-1-2 © 2013 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp TSZ22111・15・001 22 .JUL.2013 Rev.001 (4)Setting the output voltage (VO) The output voltage is determined by the equation below. Select a combination of R1 and R2 to obtain the required voltage. Note that a small resistor value leads to a drop in power efficiency and that a large resistor value leads to an increase of the offset voltage due to FB pin source current of 0.13µA (Typ). (5)Setting the oscillation frequency (fOSC) The setting of the internal oscillation frequency is possible by use of the resistor value connecter to RT. The setting range is 250kHz to 550kHz. The correlation between the resistor value and the oscillation frequency is as shown in the table and Figure 22. below. Setting a resistor outside the range shown below may cause the switching to stop after witch operation is no longer guaranteed. Note that in case the input/output voltage difference is small, the oscillation frequency is divided by 5, reducing the output voltage drop. The detail behavior is described in the description of Oscillator on page 4. Figure 22. RT resistor vs. oscillation frequency (6)Setting the soft start time (TSS) The soft start function is necessary to prevent inrush of coil current and output voltage overshoot at startup. The Figure 23. shows the relation between soft start time and capacitance, which can be calculated by using the equation. 0.8V(Typ) × CSS TSS = [sec] ISS(10μA (Typ)) Figure 23. Capacitance vs. Soft Start Time Capacitance values between 0.01µF and 0.1µF are recommended. There is a possibility that an overshoot is generated in the output due to the phase compensation, output capacitor, etc. Therefore, verification and confirmation with the actual application is recommended. Use high accuracy components (X5R) when implementing sequential startups involving other power sources. RT Resistor Oscillation Frequency 180k Ω 200k Ω 220k Ω 240k Ω 270k Ω 300k Ω 250kHz 300kHz 350kHz 400kHz 480kHz 550kHz 100 200 300 400 500 600 700 150 200 250 300 350 RT RESITANCE[k Ω] 0.1 1 10 0.01 0.1 SS CAPACITANCE[µF] Figure 21. Setting the Output Voltage VO = 0.8 × R1 + R2 R2 |
Numéro de pièce similaire - BD9015KV-M |
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Description similaire - BD9015KV-M |
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