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ML0308 Scheda tecnica(PDF) 4 Page - Minilogic Device Corporation Limited |
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ML0308 Scheda tecnica(HTML) 4 Page - Minilogic Device Corporation Limited |
4 / 4 page Preliminary ML0308 THEORY OF OPERATION The ML0308 uses a PFM, current mode control scheme to provide excellent line and load regulation. Its operation can be best explained with reference to figure 2 and figure 1. The oscillator generates a clock of 1.0MHz with 75% duty ratio for the main control logic. When EN pin goes HIGH, the power MOSFET switches at 1.0 MHz to drive the LED current up to the target level. When the inductor current reaches the limit, comparator A3 will toggle and the MOSFET will stop charging the inductor until the inductor current falls below the limit. Therefore, soft-start is achieved and potential hazards from explosive startup are avoided. When LED current reaches and rises over the regulation point, feedback voltage at FB pin will raise over 200mV and comparator A2 toggles. The chip will then stop switching the MOSFET until LED current falls below the threshold. Therefore, LED current is regulated and the threshold. HISTORY OF REVISION REV DESCRIPTION DATE PRE0 Preliminary Release 12/03/2004 PRE1 Preliminary Release1 18/08/2004 DISCLAIMER: The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. |
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