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MP8709 Scheda tecnica(PDF) 13 Page - Monolithic Power Systems

Il numero della parte MP8709
Spiegazioni elettronici  High Efficiency 4A, 21V, 500kHz Synchronous Step-down Converter
PDF  14 Pages
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Produttore elettronici  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP8709 Scheda tecnica(HTML) 13 Page - Monolithic Power Systems

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MP8709 – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
MP8709 Rev. 1.01
www.MonolithicPower.com
13
12/14/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
External Bootstrap Diode
An external bootstrap diode may enhance the
efficiency of the regulator, the applicable
conditions of external BST diode is:
Duty cycle is high: D=
IN
OUT
V
V
>65%
In this case, an external BST diode is
recommended from the VCC pin to BST pin, as
shown in Figure 5
SW
BST
MP8709
C
L
BST
COUT
External BST Diode
VCC
IN4148
Figure 5—Add Optional External Bootstrap
Diode to Enhance Efficiency
The recommended external BST diode is
IN4148, and the BST cap is 0.1~1µF.



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