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ACT4088 Datasheet(PDF) 8 Page - Active-Semi, Inc |
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ACT4088 Datasheet(HTML) 8 Page - Active-Semi, Inc |
8 / 11 page ACT4088 Rev PrA, 24-Jul-07 Innovative Products. Active Solutions. - 8 - www.active-semi.com Copyright © 2007 Active-Semi, Inc. Soft-Start The ACT4088 provides an internal soft-start fea- ture, which ramps the output voltage and output current are from 0 to the full value over 0.5 millisec- onds. This feature prevents output voltage over- shoot at light loads as well as to prevent large in- rush currents upon startup. The soft-start circuitry is internally reset anytime the IC is disabled using the EN pin, as well as if the IC reaches hiccup mode or thermal shutdown. In all of these cases, soft-start provides a smooth, controlled restart after the fault is removed. Frequency Foldback The voltage at FB is monitored by a comparator to detect an extreme output overload condition. If the voltage at the FB pin falls to below 0.3V, the inter- nal oscillator slows to a decreased frequency of 467kHz, 33% of the nominal value. This prevents the inductor current from rising excessively during a dead-short condition, potentially resulting in induc- tor saturation. Figure 2: ACT4088 Typical 5V/1.5A Output Application ACT4088 IN EN BST SW FB G C1 10µF D1 B240A C3 22nF L1 4.7µH C2 22µF VOUT 5V VIN RFB2 RFB1 49.9k Ω 1% 9.53k Ω 1% 6 5 4 3 2 1 OFF ON D2 1N4148 (Optional) Optional Connection: IN if VIN < 5.5V OUT if VOUT < 5.5V |
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Similar Description - ACT4088 |
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