參數(shù)資料
型號(hào)： L6728TR
廠商： 意法半導(dǎo)體
英文描述： Single phase PWM controller with PowerGOOD
中文描述： 單相PWM控制器與電源良好
文件頁(yè)數(shù)： 17/32頁(yè)
文件大小： 942K
代理商： L6728TR
L6728
Application details
17/32
b)
Place F
Z1
below F
LC
(typically 0.5*F
LC
):
R
F
F
LC
c)
Place F
P1
at F
ESR
:
d)
Place F
Z2
at F
LC
and F
P2
at half of the switching frequency:
R
2 F
LC
e)
Check that compensation network gain is lower than open loop EA gain before
F
0dB
;
Check phase margin obtained (it should be greater than 45°) and repeat if
necessary.
f)
10.2
Layout guidelines
L6728 provides control functions and high current integrated drivers to implement high-
current step-down DC-DC converters. In this kind of application, a good layout is very
important.
The first priority when placing components for these applications has to be reserved to the
power section, minimizing the length of each connection and loop as much as possible. To
minimize noise and voltage spikes (EMI and losses) power connections (highlighted in
Figure 7
) must be a part of a power plane and anyway realized by wide and thick copper
traces: loop must be anyway minimized. The critical components, i.e. the power MOSFETs,
must be close one to the other. The use of multi-layer printed circuit board is recommended.
The input capacitance (C
IN
), or at least a portion of the total capacitance needed, has to be
placed close to the power section in order to eliminate the stray inductance generated by the
copper traces. Low ESR and ESL capacitors are preferred, MLCC are suggested to be
connected near the HS drain.
Use proper VIAs number when power traces have to move between different planes on the
PCB in order to reduce both parasitic resistance and inductance. Moreover, reproducing the
same high-current trace on more than one PCB layer will reduce the parasitic resistance
associated to that connection.
Connect output bulk capacitors (C
OUT
) as near as possible to the load, minimizing parasitic
inductance and resistance associated to the copper trace, also adding extra decoupling
capacitors along the way to the load when this results in being far from the bulk capacitors
bank.
C
F
-----------------------------
=
C
P
C
2
π
R
F
C
F
F
ESR
1
–
----------------------------------------------------------
=
R
S
-----------------
1
–
---------------------------
=
C
S
R
S
F
SW
-------------------------------
=
相關(guān)PDF資料
PDF描述
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參數(shù)描述
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L6730_09 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification
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