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參數(shù)資料
| 型號： | L6717 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFPN-48 |
| 文件頁數(shù)： | 44/56頁 |
| 文件大?。?/td> | 1081K |
| 代理商： | L6717 |
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L6717
System control loop compensation
Doc ID 17326 Rev 1
49/56
11
System control loop compensation
The device embeds two separate and independent control loops for CORE and NB section.
The control loop for NB section is a simple voltage-mode control loop with (optional) voltage
positioning featured when DROOP pin is shorted with FB. The control loop for the CORE
section also features a current-sharing loop to equalize the current carried by each of the
configured phases.
The CORE control system can be modeled with an equivalent single-phase converter
whose only difference is the equivalent inductor L/N (where each phase has an L inductor
and N is the number of the configured phases). See Figure 17.
Figure 17.
Equivalent control loop for NB and CORE sections
This means that the same analysis can be used for both the sections with the only exception
of the different equivalent inductor value (L=LNB for NB section and L=LCORE/N for the
CORE section) and the current reading gain (DCR/RG_NB for NB Section and DCR/RG for
the CORE section).
The control loop gain results (obtained opening the loop after the COMP pin):
Where:
●
RLL is the equivalent output resistance determined by the droop function;
●
ZP(s) is the impedance resulting by the parallel of the output capacitor (and its ESR)
and the applied load RO;
●
ZF(s) is the compensation network impedance;
●
ZL(s) is the equivalent inductor impedance;
●
A(s) is the error amplifier gain;
●
is the PWM transfer function.
The control loop gain for each section is designed in order to obtain a high DC gain to
minimize static error and to cross the 0dB axes with a constant -20 dB/Dec. slope with the
desired crossover frequency
ω
T. Neglecting the effect of ZF(s), the transfer function has one
zero and two poles; both the poles are fixed once the output filter is designed (LC filter
resonance
ω
LC) and the zero (ωESR) is fixed by ESR and the droop resistance.
Ref
NB_COMP
NB_VSEN
NB_FBG
RF_NB CF_NB
RFB_NB
PWM
LNB
ESR_NB
CO_NB
R
O_NB
d VNB_COMP
VOUT_NB
ZF(s)
ZFB(s)
k
DRPNB
I DR
OOP_NB
VID_NB
V
NB_COMP
Ref
COMP
VSEN
FBG
RF
CF
RFB
PWM
LCORE/N
ESR
CO
R
O
d VCOMP
VOUT
ZF(s)
ZFB(s)
k
DRP
I
DR
OOP
VID_CORE
V
COMP
FB
NB_FB
G
LOOP s
()
PWM Z
F s
() R
LL
Z
P s
()
+
()
Z
P s
() Z
L s
()
+
[]
Z
F s
()
As
()
--------------
1
As
()
------------
+
R
FB
+
-------------------------------------------------------------------------------------------------------------------
–
=
PWM
3
5
---
V
IN
ΔV
OSC
-------------------
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6717A | 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller Tray 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Trays 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver |
| L6717ATR | 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller T/R 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Tape and Reel 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver |
| L6717TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 High-Efficienc AM2r2 Hybrid Controller 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 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6718TR | 功能描述:其他電源管理 Multiphase Dual PWM VR12 25MHz LTB RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| L6720 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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