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参数资料
| 型号： | L6727 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, SOP-8 |
| 文件页数： | 9/34页 |
| 文件大小： | 974K |
| 代理商： | L6727 |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6727_10 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Single phase PWM controller |
| L6727TR | 功能描述:开关变换器、稳压器与控制器 Single PWM controler RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6728 | 功能描述:DC/DC 开关控制器 Sngl phase PWM controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6728_0706 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Single phase PWM controller with Power Good |
| L6728A | 功能描述:电压模式 PWM 控制器 Hi-Freq. singl-phase PWM controller w/Po RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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