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參數(shù)資料
| 型號： | L6712AQ |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| 中文描述： | 兩相交錯DC / DC控制器 |
| 文件頁數(shù)： | 11/27頁 |
| 文件大?。?/td> | 1074K |
| 代理商： | L6712AQ |
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11/27
L6712A L6712
CURRENT READING AND OVER CURRENT
The current flowing trough each phase is read using the voltage drop across the low side mosfets R
dsON
or across a sense resistor (R
SENSE
) in series to the LS mosfet and internally converted into a current. The
transconductance ratio is issued by the external resistor Rg placed outside the chip between ISENx and
PGNDSx pins toward the reading points. The differential current reading rejects noise and allows to place
sensing element in different locations without affecting the measurement's accuracy. The current reading
circuitry reads the current during the time in which the low-side mosfet is on (OFF Time). During this time,
the reaction keeps the pin ISENx and PGNDSx at the same voltage while during the time in which the
reading circuitry is off, an internal clamp keeps these two pins at the same voltage sinking from the ISENx
pin the necessary current (Needed if low-side mosfet R
dsON
sense is implemented to avoid absolute max-
imum rating overcome on ISENx pin).
The proprietary current reading circuit allows a very precise and high bandwidth reading for both positive
and negative current. This circuit reproduces the current flowing through the sensing element using a high
speed Track & Hold transconductance amplifier. In particular, it reads the current during the second half
of the OFF time reducing noise injection into the device due to the mosfet turn-on (See fig. 4-left). Track
time must be at least 200ns to make proper reading of the delivered current.
This circuit sources a constant 50
μ
A current from the PGNDSx pin: it must be connected through the Rg
resistor to the ground side of the sensing element (See Figure 4-right). The two current reading circuitries
use this pin as a reference keeping the ISENx pin to this voltage.
The current that flows in the ISENx pin is then given by the following equation:
Where R
SENSE
is an external sense resistor or the R
dsON
of the low side mosfet and R
g
is the transcon-
ductance resistor used between ISENx and PGNDSx pins toward the reading points; I
PHASEx
is the current
carried by the relative phase. The current information reproduced internally is represented by the second
term of the previous equation as follow:
Since the current is read in differential mode, also negative current information is kept; this allow the de-
vice to check for dangerous returning current between the two phases assuring the complete equalization
between the phase's currents. From the current information of each phase, information about the total cur-
rent delivered (I
FB
= I
INFO1
+I
INFO2
) and the average current for each phase (I
AVG
= (I
INFO1
+I
INFO2
)/2 ) is
taken. I
INFOX
is then compared to I
AVG
to give the correction to the PWM output in order to equalize the
current carried by the two phases.
Figure 4. Current reading timing (left) and circuit (right)
I
ISENx
50
μ
A
R
I
R
g
-------------------------------------------------
50
μ
A
I
INFOx
+
=
+
=
I
INFOx
R
I
R
g
-------------------------------------------------
=
R
S
Rg
50
μ
A
I
ISENx
I
P
Rg
LGATEx
ISENx
PGNDSx
I
LS1
I
LS2
Track & Hold
I
FB
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6712AQTR | TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712D | TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712DTR | TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712Q | TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712 | TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6712AQTR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6712D | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6712DTR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6712Q | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6712QTR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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