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BL8532B Datasheet(PDF) 6 Page - SHANGHAI BELLING CO., LTD. |
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BL8532B Datasheet(HTML) 6 Page - SHANGHAI BELLING CO., LTD. |
6 / 11 page http://www.belling.com.cn - 6- 2/20/2013 Total 13 Pages BL8532B For example, input 1.5V, output 3.0V, load 20 (150mA),rL=0.5 ,efficiency loss 10% . Considering, suggest to use an inductance of 15 uH , <0.5 . ( ( ( (2) ) ) )Capacitor Selection No considering the inductor with equivalent series resistor(ESR), output voltage ripple is: r= Vout Vout ∆ = Cf R D load considering the inductor’s ESR, the output ripple will be increase: Vout R ax r r ESR • + = ′ Im Suggest to use Tantalum type with the low ESR or more parallel-resistor. ( ( ( (3) ) ) )Diode Selection It is recommended that the diode have great effect to DC-DC efficiency, we suggest to use schottky diode with the lower positive turn-on voltage and the lower corresponsive time. For example, 1N5817、1N5819 . ( ( ( (4) ) ) )Input Capacitor Power supply is stably, even if no input capacitor, DC-DC can output voltage with the lower ripple and the lower noise. But we suggest to connect with the capacitor of 10uF or more when the power supply was far away DC-DC, for minish the output noise. ( ( ( (5) ) ) )Resistor R1、 、 、 、R2 for output voltage detect Application to invariant current , the formula of R1、R2: 1 2 1 + = R R V Vout IFB |
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