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参数资料
| 型号： | L6711TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, TQFP-48 |
| 文件页数： | 11/50页 |
| 文件大小： | 679K |
| 代理商： | L6711TR |
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L6711
Current reading and current sharing control loop
19/50
7
Current reading and current sharing control loop
The device embeds a flexible, fully-differential current sense circuitry that is able to read
across both low side or inductor parasitic resistance or across a sense resistor placed in
series to that element. The fully-differential current reading rejects noise and allows placing
sensing element in different locations without affecting the measurement's accuracy. The
kind of sense element can be simply chosen through the CS_SEL pin: setting this pin free,
the LS mosfet is used while shorting it to SGND, the inductor will be used instead. Details
about connections are shown in Figure 5.
The high bandwidth current sharing control loop allows current balance even during load
transients: a current reference equal to the average of the read current (IAVG) is internally
built and the error between the read current and this reference is converted to a voltage that
with a proper gain is used to adjust the duty cycle whose dominant value is set by the
voltage error amplifier.
Figure 5.
Current reading connections selectable through CS_SEL pin.
7.1
Low-side current reading
Leaving CS_SEL pin OPEN, the current flowing trough each phase is read using the voltage
drop across the low side mosfets RdsON or across a sense resistor in its series and it is
internally converted into a current. The transconductance ratio is issued by the external
resistor Rg placed outside the chip between CSx- and CSx+ pins toward the reading points
(see Figure 6 right). The proprietary current sense circuit tracks the current information for a
time TTRACK = TSW/3 (TSW = 1/FSW) centered in the middle of the low-side mosfet
conduction time (OFF Time, see Figure 6 left) and holds the tracked information during the
rest of the period.
This device sources a constant 50
A 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 when LS mosfet RdsON
sense is implemented to avoid absolute maximum rating overcome on CSx- pin). The
current that flows from the CSx- pin is then given by the following equation (See Figure 6 -
right):
where:
RdsON is the on resistance of the low side mosfet and Rg is the transconductance 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.
L
RL
Rg(RC)
Cg
Rg
CSx+
CSx-
PHASEx
OUT
IPHASE
CS_SEL
Rg(a)
LS MOSFET Current Sense
Inductor Current Sense
CSx-
CSx+
LGATEx
Rg
IPHASE
CS_SEL
I
CSx-
50
A
R
dsON
R
g
----------------- IPHASEx
+
50
AI
INFOx
+
==
I
INFOx
R
dsON
R
g
----------------- IPHASEx
=
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相关代理商/技术参数 |
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| L6712AD | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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 |
| L6712ADTR | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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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