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BL9384 Datasheet(PDF) 5 Page - SHANGHAI BELLING CO., LTD. |
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BL9384 Datasheet(HTML) 5 Page - SHANGHAI BELLING CO., LTD. |
5 / 6 page www.belling.com.cn 5 BL9384 FUNCTIONAL DECRIPTIONS Loop Operation The BL9384 is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to 3A of output current, integrated with a 110m Ω synchronous MOSFET, eliminating the need for external diode. It uses a PWM current-mode control scheme. An error amplifier integrates error between the FB signal and the internal reference voltage. The output of the integrator is then compared to the sum of a current-sense signal and the slope compensation ramp. This operation generates a PWM signal that modulates the duty cycle of the power MOSFETs to achieve regulation for output voltage. Current Limit There is a cycle-by-cycle current limit on the high-side MOSFET of 3A(typ). When the current flowing out of SW exceeds this limit, the high-side MOSFET turns off and the synchronous rectifier turns on. Unlike the traditional method of current limiting by limiting the voltage at the compensation pin, which usually has large variation due to duty cycle variance, this type of peak current limiting scheme provides a relatively more accurate limit for output current, thereby lowering the requirements for system design. COMPONENT SELECTRION When setting up the BL9384 for different output voltage, please use following recommended component value for the best performance. VOUT (V) COUT ( µF) L ( µH) 8 22x2 22 5 22x2 15 3.3 22x2 10 2.5 22x2 6.8 1.8 22x2 4.7 1.2 22x2 3.3 |
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