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ML0308 Scheda tecnica(PDF) 4 Page - Minilogic Device Corporation Limited

Il numero della parte ML0308
Spiegazioni elettronici  ML0308 Backlight LED Boost Converter
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Produttore elettronici  MINILOGIC [Minilogic Device Corporation Limited]
Homepage  http://www.minilogic.com.hk
Logo MINILOGIC - Minilogic Device Corporation Limited

ML0308 Scheda tecnica(HTML) 4 Page - Minilogic Device Corporation Limited

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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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