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| 型号： | L6706 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, QCC40 |
| 封装： | 6 X 6 MM, ROHS COMPLIANT, VFQFPN-40 |
| 文件页数： | 9/47页 |
| 文件大小： | 623K |
| 代理商： | L6706 |
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L6706
DAC and current reading
Doc ID 15698 Rev 2
17/47
6
DAC and current reading
L6706 embeds VRD11.x DAC (see Table 7) that allows to regulate the output voltage with a
tolerance of ±0.5% recovering from offsets and manufacturing variations.
The device automatically introduces a -19 mV (both VRD11.x) offset to the regulated
voltage in order to avoid any external offset circuitry to worsen the guaranteed accuracy
and, as a consequence, the calculated system TOB.
Output voltage is programmed through the VID pins: they are inputs of an internal DAC that
is realized by means of a series of resistors providing a partition of the internal voltage
reference. The VID code drives a multiplexer that selects a voltage on a precise point of the
divider. The DAC output is delivered to an amplifier obtaining the voltage reference (i.e. the
set-point of the error amplifier, VREF).
L6706 embeds a flexible, fully-differential current sense circuitry that is able to read across
inductor parasitic resistance or across a sense resistor placed in series to the inductor
element. The fully-differential current reading rejects noise and allows placing sensing
element in different locations without affecting the measurement's accuracy.
Reading current across the inductor DCR, the current flowing trough 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 CS- pin toward the reading points.
The current sense circuit always tracks the current information, no bias current is sourced
from the CS+ pin: this pin is used as a reference keeping the CS- 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 CS- pin is then given by the following equation (see
Where IPHASE is the current carried by the relative phase.
Figure 4.
Current reading connections
Considering now to match the time constant between the inductor and the R-C filter applied
(Time constant mismatches cause the introduction of poles into the current reading network
I
CS-
DCR
Rg
-------------
1s LDCR
()
+
1s R C
+
------------------------------------------- I
PHASE
=
L
CS+
CS-
PHASE
DCR
R
C
Rg
I
PHASEx
Inductor DCR Current Sense
ICS-=IINFO
NO Bias
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相关代理商/技术参数 |
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|---|---|
| L6706TR | 功能描述:DC/DC 开关控制器 VR11.1 SINGLE PHASE CNTRL W/INT DRI RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6709 | 功能描述:功率驱动器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6709TR | 功能描述:功率驱动器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6710 | 功能描述:功率驱动器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6710TR | 功能描述:功率驱动器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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