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参数资料
| 型号： | L6717 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFPN-48 |
| 文件页数： | 30/56页 |
| 文件大小： | 1081K |
| 代理商： | L6717 |
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Output voltage positioning
L6717
36/56
Doc ID 17326 Rev 1
Figure 10.
Current reading
The current read through the CSxP / CSxN pairs is converted into a current IINFOx propor-
tional to the current delivered by each phase and the information about the average current
IAVG = ΣIINFOx / N is internally built into the device (N is the number of working phases). The
error between the read current IINFOx and the reference IAVG is then converted into a voltage
that with a proper gain is used to adjust the duty cycle whose dominant value is set by the
voltage error amplifier in order to equalize the current carried by each phase.
7.3
CORE section - defining load-line
L6717 introduces a dependence of the output voltage on the load current recovering 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.
Figure 10 shows the current sense circuit used to implement the load-line. The current flow-
ing across the inductor(s) is read through the R - C filter across CSxP and CSxN pins. RG
programs a trans-conductance gain and generates a current ICSx proportional to the current
of the phase. The sum of the ICSx current, with proper gain defined by the DRP_ADJ com-
mand (kDRP), is then sourced by the FB pin (kDRPIDROOP). RFB gives the final gain to pro-
gram the desired load-line slope (Figure 9).
Time constant matching between the inductor (L / DCR) and the current reading filter (RC)
is required to implement a real equivalent output impedance of the system so avoiding over
and/or under shoot of the output voltage as a consequence of a load transient. See
Section 7.2. The output characteristic vs. load current is then given by:
Where RLL is the resulting load-line resistance implemented by the CORE Section. kDRP
value is determined by the Power Manager I2C and its default value is 1/4.
RFB resistor can be then designed according to the RLL specifications and DRP_ADJ setting
as follow:
See Section 6.2 for details about DRP_ADJ command.
Lx
CSxP
CSxN
DCRx
R
C
RG
I
PHASEx
Inductor DCR Current Sense
ICSxN=IINFOx
V
OUT
V
CORE
VID
R
FB
k
DRP
I
DROOP
–
VID
k
DRP
R
FB
DCR
R
G
------------- I
OUT
–
VID
R
LL
I
OUT
–
==
=
R
FB
R
LL
k
DRP
-------------
R
G
DCR
-------------
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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:开关变换器、稳压器与控制器 High-Efficienc AM2r2 Hybrid Controller 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 |
| L6718TR | 功能描述:其他电源管理 Multiphase Dual PWM VR12 25MHz LTB RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| L6720 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
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