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参数资料
| 型号： | L6714 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64 |
| 封装： | 10 X 10 MM, LEAD FREE, TQFP-64 |
| 文件页数： | 27/70页 |
| 文件大小： | 694K |
| 代理商： | L6714 |
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L6714
Current reading and current sharing loop
33/70
10.1
Low side current reading
When reading current across LS, the current flowing trough each phase is read using the
voltage drop across the low side MOSFET RdsON or across a sense resistor in its series and
it is internally converted into a current. The trans-conductance ratio is issued by the external
resistor Rg placed outside the chip between CSx- and CSx+ pins toward the reading points.
The current sense circuit tracks the current information for a time TTRACK centered in the
middle of the LS conduction time and holds the tracked information during the rest of the
period.
L6714 sources a constant 25
A bias current from the CSx+ pin: the current reading circuitry
uses this pin as a reference and the reaction keeps the CSx- pin to this voltage during the
reading time (an internal clamp keeps CSx+ and CSx- at the same voltage sinking from the
CSx- pin the necessary current during the hold time; this is needed to avoid absolute
maximum rating overcome on CSx- pin). The current that flows from the CSx- pin is then
given by (See Figure 9):
where RdsON is the ON resistance of the low side MOSFET and Rg is the trans-conductance
resistor used between CSx- and CSx+ pins toward the reading points; IPHASEx is the current
carried by the relative phase and IINFOx is the current information signal reproduced
internally.
25
A offset allows negative current reading, enabling the device to check for dangerous
returning current between the phases assuring the complete current equalization.
10.2
Inductor current reading
When reading current across the inductor DCR, the current flowing trough each phase is
read using the voltage drop across the output inductor or across a sense resistor in its
series and internally converted into a current. The trans-conductance ratio is issued by the
external resistor Rg placed outside the chip between CSx- pin toward the reading points.
The current sense circuit always tracks the current information, no bias current is sourced
from the CSx+ pin: this pin is used as a reference keeping the CSx- pin to this voltage. To
correctly reproduce the inductor current an R-C filtering network must be introduced in
parallel to the sensing element.
The current that flows from the CSx- pin is then given by the following equation (See
Where IPHASEx is the current carried by the relative phase.
I
CSx-
25
A
R
dsON
Rg
-----------------
I
PHASEx
+
25
AI
INFOx
+
==
I
CSx-
R
L
Rg
--------
1s
L
R
L
+
1s
R
C
+
-------------------------------------
I
PHASEx
=
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相关代理商/技术参数 |
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|---|---|
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| L6716TR | 功能描述:开关变换器、稳压器与控制器 2/3/4 phase CNTRL Embedded Drivers 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 |
| L6717 | 制造商:STMicroelectronics 功能描述:High-Efficiency Hybrid AM2r2 Controller 48-Pin VFQFPN 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 |
| 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 |
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