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ACT6311 Datasheet(PDF) 4 Page - Active-Semi, Inc |
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ACT6311 Datasheet(HTML) 4 Page - Active-Semi, Inc |
4 / 11 page ACT6311 Innovative PowerTM - 4 - www.active-semi.com Copyright © 2012 Active-Semi, Inc. Rev 4, 15-Nov-12 FUNCTIONAL DESCRIPTION The ACT6311 is a high efficiency step-up DC/DC converter that employs a current-mode, fixed frequency pulse-width modulation (PWM) architecture with excellent line and load regulation. Figure 3 shows the functional block diagram of the IC. The flip-flop is set at the start of each oscillator cycle, and turns on the power switch. During this on time, the switch current level is sensed and added to a ramp signal, and the resulting sum is compared with the output of the error amplifier. If the error comparator output is high, the flip-flop is reset and the power switch turns off. Thus, the peak inductor current level is controlled by the error amplifier output, which is integrated from the difference between FB input and the 1.24V reference point. The ACT6311 operates at a constant switching frequency for output current higher than 4mA. If the output current decreases further, the IC will enter frequency modulation mode, resulting in some low frequency ripple. Figure 3. Functional Block Diagram ERROR AMPLIFIER |
Similar Part No. - ACT6311_14 |
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Similar Description - ACT6311_14 |
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