See ADI release this activity, as well as the various awards, one's fingers itch a bit, because the requirement of the competition and I used before ling chips have similar indicators, ling after the buyout by ADI, have this activity, just to try again! The scheme in order to obtain high efficient ways of working, use synchronous rectification BUCK works, realizing DC12V input, DC2.5 V output, due to the input low static working current characteristics, must want to choose low IQ chip, to realize the no-load BUCK converter under low current consumption, meet the low power consumption standby application, registration when I chose LT8460 and LT8650 these two chips, later due to the shortage of domestic LT8650 and eventually received only LT8640S this type of IC, so use LT8640S chip to realize the efficient synchronous rectifier converter as the scheme of the main controller chip, the chip inside has integrated the necessary synchronous BUCK a half-bridge MOSFET and a variety of logic control unit, under the high frequency work provide all the necessary support, can be simplified to reduce the complexity of the peripheral components, using the chip of Silent Switcher 2 architecture technology, implementation in the high frequency switch operating under low EMI radiation, and can use the lower cost of layer 2 PCB design can complete!
Chip selection has been set, the next is to enter the substantive work schedule, over LT8640S again in detail specification is as follows:
LT8640s. PDF (2.23 MB, downloaded: 1)
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The input voltage: DC12V
Output voltage: DC2.5 V
Output current: & gt; 2 a
Efficiency: & gt; 95%
Static: idle current & lt; 3 ua
The output ripple voltage: & lt; 10 mv @ the LOAD CURRENT=2 a
Transient characteristics: & lt; 100 mv @ the LOAD CURRENT is 0.1 A - 1.5 the index may LT8460S can easily operate, A comparison with S LT8640 is fast transient compensation of external pins,
This sample has received a few days, come first a macro photography LT8640S makes the shine on!
