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參數(shù)資料
| 型號： | ML4895 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的同步補償控制器（5.9V～15V到2.5V～4V變換）) |
| 中文描述： | 同步降壓控制器，用于直流/直流轉(zhuǎn)換（用于直流/直流變換的同步補償控制器（高于全?15V的到為2.5V?4V變換）） |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 248K |
| 代理商： | ML4895 |
ML4895
9
Figure 6. 3.3V, 3A DC/DC Converter Circuit
LAYOUT
A typical application circuit is shown in Figure 6.
Proximity of passive devices and adequate power and
ground planes are critical for reliable operation of the
circuit. In general, use the top layer for the high current
connections and the bottom layer for the quiet
connections such as GND, feedback and current sense.
Some more specific guidelines follow.
1. The connection from the current sense resistor to the
I
SENSE
pin should be made by a separate trace and
located as close to the lead of the resistor as possible.
The trace length from the sense resistor to the ML4895
should be kept as short as possible and away from
switching components and their traces.
2. The trace lengths from the buck regulator’s input
capacitor to the switching MOSFET, from the MOSFETs
to the inductor, from the synchronous rectifier MOSFET
to the sense resistor, and from the inductor to the output
capacitor should all be as short as possible.
DESIGN CONSIDERATIONS
(Continued)
3. The high current ground paths need to be kept separate
from the signal ground paths. The GND connection
should be made at a single-point star ground. It is very
important that the ground for the ML4895 GND pin be
made using a separate trace.
4. Concentrating on keeping the current sense and high
current connections short as well as keeping the
switching components and traces away from the
sensitive analog components and traces during layout
will eliminate the majority of problems created by a
poor layout.
5. The V
REG
and bypass capacitor needs to be located
close to the ML4895 for adequate filtering of the IC’s
internal bias voltage.
6. Remote sensing the output for improved load regulation
can be implemented with the ML4895. The output can
be remote sensed by using the top of the external
resistor divider as the remote sense point.
VOUT
3.3V
+
–
VIN
C1
22μF
C2
22μF
C3
22μF
C4
1μF
Q1
IRF7406
Q2
IRF7403
L1
20μH
R1
25m
R3
453k
R2
154k
C5
10nF
C6
100μF
C7
100μF
C8
100μF
ML4894
VREG
VFB
ISENSE
SHDN
VIN
P DRV
N DRV
GND
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4895ES | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4895ESX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| ML4900 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Synchronous Buck Controller |
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