BL8531 DIODE SELECTION INPUT CA PACTITOR Rectifier diode will affects efficiency greatly， If supply voltage is stable, the DC-DC circuit can Though a common diode (such as 1N4148) will output low ripple, low noise and stable voltage work well for light load，it will reduce about without input capacitor. If voltage source is far 5%~10% efficiency for heavy load，For optimum away from DC-DC circuit, input capacitor value performance, a Schottky diode (such as 1N5817、 greater than 10uF is recommended. 1N5819、1N5822) is recommended. TEST CIRCUITS Output voltage test circuit Quiescent current test circuit (Iload=1mA) (Vout=Vout_nom*1.05, R=1KΩ, C=0.1uF) BL8531 BL8 L 53 5 1 Start-up voltage test circuit Oscillator frequency and duty cycle test circuit (Iload=1mA) (Vin=Vout*0.95，R=1KΩ) BL8 L 53 5 1 BL B 8 L 5 8 3 5 1 3 1 BL8531 Hold-on voltage test circuit (Iload=1mA) BL8 L 53 5 1 www.belling.com.cn 6
