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参数资料
型号： L6722
厂商： STMICROELECTRONICS
元件分类： 稳压器
英文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, QCC36
封装： 6 X 6 MM, 1 MM PITCH, VFQFPN-36
文件页数： 11/34页
文件大小： 421K
代理商： L6722
Obsolete
Product(s)
- Obsolete
Product(s)
L6722
7 Output voltage positioning
19/34
Time constant matching between the inductor (L / DCR) and the current reading filter
(
) 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. In
fact, considering the scheme reported on Figure 9, it is possible to observe that:
By applying the time constant matching concept, it results:
=>
The device forces IDROOP = ICS x 3, proportional to the read current, into the feedback resistor
RFB implementing the load regulation dependence. The output characteristic vs. load current is
then given by (Offset disabled):
Where RLL is the resulting load-line resistance implemented by the system.
The whole power supply can be then represented by a "real" voltage generator with an
equivalent output resistance RLL and a voltage value of VID.
RFB resistor can be then designed according to the RLL specifications as follow:
Warning:
Droop function is operational for output voltages up to 1.8V.
Caution:
Droop function is optional, in case it is not desired, the Current Sense circuit can be tricked so
that the device always read a null current. To do this, it is enough connecting CS+ directly to the
output voltage leaving CS- unconnected. The reaction will keep CS+ and CS- at the same
voltage, always reading a null current and also assuring the FB disconnection protection to be
effective. To aovid setting the FB-disconnection protection, it is also suggested to connect CS+
to local-VOUT through the same resistor divider used as external divider (See Figure 1).
To disable also the FB disconnection protection, CS+ can be directly connected to VSEN or
SGND.
Figure 9.
Droop function current reading network
R
PH
C
PH
S
I
OUT
3
------------
1s
L
DCR
+
1s
R
PH
C
PH
3
+
-------------------------------------------------------------
DC
R
D
--------
=
L
DCR
-------------
R
PH
C
PH
3
------------------------------
=
I
CS
I
OUT
3
------------
DCR
R
D
-------------
=
OUT
VID
R
FB
I
DROOP
–
VID
R
FB
DCR
R
D
-------------
I
OUT
–
VID
R
LL
I
OU
–
==
=
R
FB
R
LL
R
D
DCR
-------------
=
L2
L1
L3
DCR1
DCR2
DCR3
CPH
R
PH
R
PH
R
PH
RD
PHASE3
PHASE2
PHASE1
VOUT
ICS
CS+
CS-
FB
IDROOP
x 3
RF
CF
RFB
COMP
L2
L1
L3
DCR1
DCR2
DCR3
PHASE3
PHASE2
PHASE1
VOUT
ICS
CS+
CS-
FB
IDROOP
x 3
RF
CF
RFB
COMP
Droop Function Enabled
Droop Function Disabled
R1
R2
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相关代理商/技术参数
参数描述
L6722TR 功能描述:开关变换器、稳压器与控制器 3 Phase 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
L6725 功能描述:开关变换器、稳压器与控制器 Vltg Mode PWM 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
L6725_07 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Voltage mode PWM controller with bootstrap anti-discharging system
L6725A 功能描述:开关变换器、稳压器与控制器 Vltg Mode PWM 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
L6725ATR 功能描述:开关变换器、稳压器与控制器 Step-Down 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
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