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ACT4533BYH-T Datasheet(PDF) 5 Page - Active-Semi, Inc |
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ACT4533BYH-T Datasheet(HTML) 5 Page - Active-Semi, Inc |
5 / 18 page ACT4533A/B Rev 0, 14-Aug-13 Innovative Power TM - 5 - www.active-semi.com Copyright © 2013 Active-Semi, Inc. FUNCTIONAL BLOCK DIAGRAM FOR ACT4533A FUNCTIONAL DESCRIPTION CV/CC Loop Regulation As seen in Functional Block Diagram, the ACT4533A/B is a peak current mode pulse width modulation (PWM) converter with CC and CV control. The converter operates as follows: A switching cycle starts when the rising edge of the Oscillator clock output causes the High-Side Power Switch to turn on and the Low-Side Power Switch to turn off. With the SW side of the inductor now connected to IN, the inductor current ramps up to store energy in the magnetic field. The inductor current level is measured by the Current Sense Amplifier and added to the Oscillator ramp signal. If the resulting summation is higher than the COMP voltage, the output of the PWM Comparator goes high. When this happens or when Oscillator clock output goes low, the High-Side Power Switch turns off. At this point, the SW side of the inductor swings to a diode voltage below ground, causing the inductor current to decrease and magnetic energy to be transferred to output. This state continues until the cycle starts again. The High-Side Power Switch is FUNCTIONAL BLOCK DIAGRAM FOR ACT4533B |
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