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| 型号： | L6711TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, TQFP-48 |
| 文件页数： | 17/50页 |
| 文件大小： | 679K |
| 代理商： | L6711TR |
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Voltage positioning
L6711
24/50
10
Voltage positioning
Output voltage positioning is performed by selecting the reference DAC and by
sourced from the FB pin, causes the output voltage to vary according to the external RFB
resistor: this allows programming precise output voltage variations depending on the
sensed current (Droop Function) as well as offsets for the regulation.
The three contributors to the IFB current value are:
●
Droop Function (green);
●
Offset (red);
●
Integrated Temperature Compensation (fuchsia).
Moreover, the embedded Remote Buffer allows to precisely programming the output voltage
offsets and variations by recovering the voltage drops across distribution lines.
The output voltage is then driven by the following relationship (IOFFSET sign depends on TC
setting):
Figure 9.
Voltage positioning and droop function
10.1
Droop function
Droop function allows the device to satisfy the requirements of high performance
microprocessors, reducing the size and the cost of the output capacitor. This method
"recovers" part of the drop due to the output capacitor ESR in the load transient, introducing
a dependence of the output voltage on the load current: a static error proportional to the
output current causes the output voltage to vary according to the sensed current. As shown
in figure 4-right, the ESR drop is present in any case, but using the droop function the total
deviation of the output voltage is minimized.
The information about the total current delivered (IDROOP) is sourced from the FB pin (see
Figure 9): connecting a resistor between this pin and VSEN (i.e. the output voltage), the total
current information flows only in this resistor because the compensation network between
then equal to:
Where VID is the reference programmed through VIDx and VID_SEL (Only the IDROOP
contribute to IFB has been considered).
VID
R
FB
I
FB
–
VID
R
FB
I
D ROOP
I
OFFSET
I
TC
–
±
()
–
=
VMAX
VMIN
VNOM
ESRDROP
RESPONSE WITHOUT DROOP
RESPONSE WITH DROOP
IDROOP
VID
FB
COMP
I
FB
VSEN
64k
FBR
FBG
64k
RF
CF
RFB
To Vcore
(Remote Sense)
IOFFSET
I TC
V
OUT
VID
R
FB
I
DR OOP
–
=
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PDF描述 |
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| L6711 | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6712 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712_05 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712AD | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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 |
| L6712ADTR | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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 |
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