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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： | 10/34页 |
| 文件大小： | 421K |
| 代理商： | L6722 |
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7 Output voltage positioning
L6722
18/34
Figure 8.
Offset definition (margin mode)
●
No Offset (M1=1; M2=0)
●
Positive Margin (M1=0; M2=0)
●
Negative Margin (M1=0; M2=1)
Offset resistors may be simply defined as follow
where VTARGET-POS and VTARGET-NEG are the target voltages for positive and negative margin
mode.
Offset current is always sourced from REF_IN pin: to avoid having steps during soft-start, the
introduction of COS is required. The resulting time-constant need to be negligible with respect to
the soft-start time as well as long enough to smooth the initial step. Typical values are in the
range of few tens / hundreds of nF.
Offset function can be easily disabled by shorting REF_IN and REF_OUT together.
Warning:
Maximum offset must be limited to less than 200mV to avoid setting the OVP protection
resulting in a maximum +25% margin.
7.2
Droop function (optional)
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.
Figure 9 shows the Current Sense Circuit used to implement the Droop Function. The current
flowing across the three inductors is read through the RPH - CPH filter across CS+ and CS- pins.
RD programs a transconductance gain and generates a current ICS proportional to the average
of the currents of the three phases. The current ICS is then mirrored and, multiplied by three,
sourced by the FB pin (IDROOP). RFB gives the final gain to program the desired load-line slope.
Ref
REF_IN
REF_OUT
I OS
ROS1
COS
ROS2
To Vout
(Remote Sense)
I DR
OOP
FB
COMP
VSEN
64k
FBR
FBG
64k
RF
CF
RFB
M1
R1
R2
M2
V
REFIN
Ref
I
OS
R
OS1
+
=
V
REFIN
Ref
I
OS
R
OS1
+
()
R
OS2
R
OS1
R
OS2
+
------------------------------------
=
R
OS1
V
TARGET
POS
–
Ref
–
I
OS
---------------------------------------------------------
=
R
OS2
R
OS1
V
TARGET
POS
–
V
TARGET
POS
–
V
TARGET
NEG
–
----------------------------------------------------------------------------------------
=
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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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