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参数资料
| 型号： | L6918ADTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 17/35页 |
| 文件大小： | 431K |
| 代理商： | L6918ADTR |
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L6918 L6918A
24/35
while placing the zero in correspondence with the L-C resonance a simple -20dB/dec shape of the gain is as-
sured (See Figure 15). In fact, considering the usual value for the output filter, the LC resonance results to be
at frequency lower than the above reported zero.
Figure 15. ACM Control Loop Gain Block Diagram (left) and Bode Diagram (right).
Compensation network can be simply designed placing
ωZ=ωLC and imposing the cross-over frequency ωT as
desired obtaining:
In a four phase operation (since the four phase converter is realized by two dual phase converters in parallel
that shares current using droop), also the other sub-system in parallel must be considered. In particular, in the
above reported relationships, it must be considered with Co and ESR the total output capacitance and equiva-
lent ESR while the output impedance Zo of the other sub-system must be considered in parallel to the output
capacitance Co and to the load Ro.
The output impedance of the other sub-system in parallel results:
Considering Zo in parallel to Ro, it can be verified that the RF and CF design relationships are still valid.
LAYOUT GUIDELINES
Since the device manages control functions and high-current drivers, layout is one of the most important things
to consider when designing such high current applications.
A good layout solution can generate a benefit in lowering power dissipation on the power paths, reducing radi-
ation and a proper connection between signal and power ground can optimize the performance of the control
loops.
Integrated power drivers reduce components count and interconnections between control functions and drivers,
reducing the board space.
Here below are listed the main points to focus on when starting a new layout and rules are suggested for a cor-
rect implementation.
dB
ω
T
ω
Z
ω
LC
GLOOP
ZF(s)
K
4
5
---
V
IN
V
osc
---------------
1
R
FB
----------
dB
=
Rout
Cout
ESR
L/2
RFB
RF
CF
REF
PWM
IFB
VCOMP
VOUT
d
VIN
ZF
R
F
R
FB
V
OSC
V
IN
----------------------------------
5
4
---
ω
T
L
2R
DROOP
ESR
+
()
-------------------------------------------------------
=
C
F
Co
L
2
---
R
F
--------------------
=
Zo s
()
Z
L s
()
4
5
---
V
IN
V
OSC
-------------------
Rsense
Rg
---------------------- Z
F s
()
+
1
4
5
---
V
IN
V
OSC
-------------------
Z
F s
()
R
FB
---------------
+
-----------------------------------------------------------------------------------------------
=
相关PDF资料 |
PDF描述 |
|---|---|
| L6918AD | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28 |
| L6919CD | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28 |
| L6919E | SWITCHING CONTROLLER, PDSO28 |
| L6920DTR | 1.2 A SWITCHING REGULATOR, PDSO8 |
| L6920D | 1.2 A SWITCHING REGULATOR, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6918D | 功能描述:DC/DC 开关控制器 Prog Multi-Phase Cnt 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 |
| L6918DTR | 功能描述:DC/DC 开关控制器 Prog Multi-Phase Cnt 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 |
| L6919 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
| L6919C | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
| L6919CD | 功能描述:DC/DC 开关控制器 Prog Dual-Phase Cont 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 |
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