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| 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： | 31/56页 |
| 文件大小： | 1081K |
| 代理商： | L6717 |
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L6717
Output voltage positioning
Doc ID 17326 Rev 1
37/56
7.4
CORE section - analog offset (Optional - I2CDIS = 3.3 V)
When power manager I2C is disabled (I2CDIS = 3.3 V), L6717 still provide the way to add
positive/negative offset to the CORE section. In this particular conditions, the pin SCL/OS
becomes a virtual ground and allows programming a positive/negative offset (VOS) for the
CORE section output voltage by connecting a resistor ROS to SGND/VCC. The pin is inter-
nally fixed at 1.240 V (2.0 V in case of negative offset, ROS tied to VCC) so a current is pro-
grammed by connecting the resistor ROS between the pin and SGND/VCC: this current is
mirrored and then properly sunk/sourced from the FB pin as shown in Figure 9. Output volt-
age is then programmed as follow:
Offset resistor can be designed by considering the following relationship (RFB is be fixed by
the droop effect):
(positive offset)
(negative offset)
Caution:
Offset implementation is optional, in case it is not desired, simply short the pin to GND.
Note:
In the above formulas, RFB has to be considered being the total resistance connected
between FB pin and the regulated voltage. kDRP has to be considered having its default
value since power manager I2C is disabled.
7.5
NB section - current reading
NB section performs the same differential current reading across DCR as the CORE Sec-
tion. According to Section 7.2, the current that flows from the NB_CSN pin is then given by
the following equation (See Figure 10):
details.
7.6
NB section - defining load-line
This method 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 depen-
dence of the output voltage on the load current, a static error, proportional to the output cur-
rent, 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 DCR is read through RG_NB. RG_NB programs a trans-conductance
gain and generates a current IDROOP_NB proportional to the current delivered by the NB
Section that is then sourced from the NB_FB pin with proper gain defined by the DRP_ADJ
V
CORE
VID
R
FB
k
DRP
I
DROOP
I
OS
–
()
–
=
R
OS
1.240V
V
OS
------------------- R
FB
=
R
OS
VCC
2.0V
–
V
OS
-------------------------------- R
FB
=
I
NB_CSN
DCR(NB)
R
G_NB
------------------------- I
NB
I
DROOP_NB
==
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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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