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ACT6305 Datasheet(PDF) 7 Page - Active-Semi, Inc |
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ACT6305 Datasheet(HTML) 7 Page - Active-Semi, Inc |
7 / 9 page ACT6305 Rev 2, 22-Feb-11 Innovative Power TM - 7 - www.active-semi.com Copyright © 2011 Active-Semi, Inc. FUNCTIONAL DESCRIPTION As seen in the Functional Block Diagram, the ACT6305 comprises a reference, low input startup circuitry, feedback select, error comparator, control logic and timers, internal power MOSFETs and cur- rent comparators. Main Control Loop The ACT6305 control architecture utilizes a series of one-shot and current sense circuits to regulate the output voltage with a very low quiescent supply current of just 17µA. An ON cycle begins when FB falls below the ACT6305’s internal reference volt- age. During an ON cycle, the N-channel power switch is turned on to connect the LX node to ground, transferring energy from input supply to the inductor. The ON cycle persists or the 1A current limit is reached. When either of these conditions occurs, the N-channel power switch turns off and the OFF cycle begins. During the OFF cycle, the energy stored in the inductor is released into the output capacitor and load through the synchronous rectifier. Once the 1µs minimum OFF time expires, another ON cycle begins when the FB voltage drops below the reference voltage. Light Load Operation Under light load conditions, the IC automatically enters a power-saving mode by extending the OFF time. This reduces switching losses and allows the ACT6305 to maintain high efficiency across a very wide load range. Low Voltage Startup The ACT6305 uses proprietary start-up circuitry that allows it to achieve very low voltage startup down to 1V. The ACT6305 remains in low voltage startup mode until VOUT exceeds 1.85V. The ACT6305 can- not support its full rated load current when operat- ing in low-voltage startup mode. Care should be taken to minimize load current during startup. Shutdown In shutdown mode, all internal circuits including the power switch and the synchronous rectifier are dis- abled, reducing quiescent supply current to less than 1µA. Note that in shutdown mode, a DC path from the input supply to the output still exists due to the body diode of the synchronous rectifier. FUNCTIONAL BLOCK DIAGRAM OUT LX G REFERENCE FEEDBACK SELECT VREF VREF DRIVER ERROR COMPARATOR LOW INPUT START UP 1µs ONE -SHOT 5µs ONE -SHOT SET LATCH Q RESET CURRENT LIMIT COMPARATOR EN FB |
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