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BL8501 Datasheet(PDF) 6 Page - SHANGHAI BELLING CO., LTD. |
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BL8501 Datasheet(HTML) 6 Page - SHANGHAI BELLING CO., LTD. |
6 / 10 page http://www.belling.com.cn - 6- 8/8/2006 Total 10 Pages BL8501 Thus, with changing the value of R2 and R4, output voltage can be set in the specified range. In the DC-DC converter, with the load current and external components such as L and C, phase might be behind 180 degree. In this case, the phase margin of the system will be less and stability will be worse. To prevent this, phase margin should be secured with proceeding the phase. A pole is formed with external components L and C3. pole F ~ 1/2 3 C L A zero (signal back to zero) is formed with R4 and C4. ) 4 4 2 /( 1 ~ C R F zero For example, if L=27 H, C3=47 F, the cut off frequency of the pole is approximately 4.5kHz. To make the cut off frequency of the pole as much as 4.5kHz, set R4=33 k and C4=1000pF. If OUT V is set at 5.5V, R2=7.3 k is appropriate. R3 prevents feedback of the noise to FB V pin, about 2.7 k is appropriate value. External Components 1. Inductor Select an inductor that peak current does not exceed max IL . If larger current than allowable current flows, magnetic saturation occurs and makes transform efficiency worse. When the load current is definite, the smaller value of L, the larger the ripple current. Provided that the allowable current is large in that case and DC current is small, therefore, for large output current, efficiency is better than using an inductor with a large value of L and vice versa. 2. Diode Use a diode with low F V (Schottky type is recommended.) and high switching speed. Reverse voltage rating should be more than IN V and current rating should be equal or more than max IL . 3. Capacitors As for IN C , use a capacitor with low ESR (Equivalent Series Resistance) and a capacity of at least 10 F for stable operation. OUT C can reduce ripple of Output Voltage, therefore 47 F or more value of tantalum type capacitor is recommended. 4. Lx Transistor Pch Power MOSFET is required for this IC. |
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