參數(shù)資料
型號(hào)： L6727
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 1.5 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8
封裝： LEAD FREE, SOP-8
文件頁(yè)數(shù)： 9/34頁(yè)
文件大?。?/td> 974K
代理商： L6727
L6727
Application details
Doc ID 12933 Rev 4
17/34
To place the poles and zeroes of the compensation network, the following suggestions may
be followed:
a)
Set the gain RF/RFB in order to obtain the desired closed loop regulator bandwidth
according to the approximated formula (suggested values for RFB range from 2 kΩ
to 5 k
Ω):
b)
Place FZ1 below FLC (typically 0.5*FLC):
c)
Place FP1 at FESR:
d)
Place FZ2 at FLC and FP2 at half of the switching frequency:
e)
Check that compensation network gain is lower than open loop EA gain;
f)
Estimate phase margin obtained (it should be greater than 45 °) and repeat,
modifying parameters, if necessary.
9.3
Layout guidelines
L6727 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 8) must be 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 (CIN), 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
R
F
R
FB
----------
F
0dB
F
LC
------------
ΔV
OSC
V
IN
-------------------
=
C
F
1
π R
F
LC
-----------------------------
=
C
P
C
F
2
π R
F
C
F
ESR
1
–
----------------------------------------------------------
=
R
S
R
FB
F
SW
2F
LC
------------------
1
–
---------------------------
=
C
S
1
π R
S
F
SW
-------------------------------
=
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L6728AHTR SWITCHING CONTROLLER, PDSO10
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6727_10 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single phase PWM controller
L6727TR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Single PWM controler RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6728 功能描述:DC/DC 開(kāi)關(guān)控制器 Sngl phase PWM controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6728_0706 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single phase PWM controller with Power Good
L6728A 功能描述:電壓模式 PWM 控制器 Hi-Freq. singl-phase PWM controller w/Po RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
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