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MP8642 Scheda tecnica(PDF) 11 Page - Monolithic Power Systems

Il numero della parte MP8642
Spiegazioni elettronici  Dual 3A, 23V, 600kHz Step-Down Converter with Frequency Synchronization
PDF  12 Pages
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Produttore elettronici  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP8642 Scheda tecnica(HTML) 11 Page - Monolithic Power Systems

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MP8642 — DUAL 3A, 23V, 600kHz STEP-DOWN CONVERTER
MP8642 Rev. 1.0
www.MonolithicPower.com
11
9/13/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
Bottom Layer
Figure 3—PCB Layout
External Bootstrap Diode
An external bootstrap diode may enhance the
efficiency of the regulator, the applicable
conditions of external BST diode are:
VOUT=5V or 3.3V; and
Duty cycle is high: D=
IN
OUT
V
V
>65%
In these cases, an external BST diode is
recommended from the output of the voltage
regulator to BST pin, as shown in Fig.4
MP8642
SW
BST
C
L
BST
C
5V or 3.3V
OUT
External BST Diode
IN4148
+
Figure 4—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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