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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 / 9 page ML0308 Preliminary ______________________________________________________________________________________________________ 4/9 Rev. B, July 2005 BLOCK DIAGRAM – ML0308B Figure 2: Internal Block Diagram of ML0308B OPERATION The ML0308 uses a pulse-skipping 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 1.2MHz with 75% duty ratio for the PFM controller. When CE pin goes HIGH, the power MOSFET switches at 1.2 MHz to charge the inductor and boost the output voltage to the target level specified by R1 and R2. The output voltage is set as follow: V R R R VOUT 23 . 1 2 2 1 × + = (ML0308B) When the inductor current reaches the current limit, comparator A3 will toggle and the control circuit will turn off the MOSFET immediately. So the inductor current is limited. Therefore, soft-start is achieved and potential hazards like current and voltage overshoot are avoided. When output voltage reaches and rises over the regulation point, amplifier A2 will amplify the error. The chip will adjust its pulse-skipping rate to monitor the output voltage. |
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