參數(shù)資料
型號： L6918
廠商： 意法半導體
英文描述： 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
中文描述： 5位可編程多相控制器
文件頁數(shù)： 14/35頁
文件大小： 760K
代理商： L6918
L6918 L6918A
14/35
Figure 4. Drivers peak current: High Side (left) and Low Side (right)
CURRENT READING AND OVER CURRENT
Each device involved in the four phase conversion has its own current reading circuitry and over current protec-
tion. As a results, the OCP network design for each device must be performed fort half of the maximum output
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
) 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 full differential current reading rejects noise and allows to place sensing element in different locations with-
out 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 maximum 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 Tran conductance amplifier. In particular, it reads the current during the second half of the OFF
time reducing noise injection into the device due to the high side mosfet turn-on (See fig. 5). 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 and keeps the pins ISENx and PGNDSx at
the same voltage. Referring to figure 5, 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 Rg is the transconductance
resistor used between ISENx and PGNDSx pins toward the reading points; I
PHASE
is the current carried by each
phase.
The current information reproduced internally is represented by the second term of the previous equation as
follow:
CH3 = HGATE1; CH4 = HGATE2
CH3 = LGATE1; CH4 = LGATE2
I
ISENx
50
μ
A
R
I
g
---------------------------------------------
50
μ
A
I
INFOx
+
=
+
=
相關(guān)PDF資料
PDF描述
L6918A 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918AD 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918ADTR 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918D 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918DTR 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6918A 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918AD 功能描述:DC/DC 開關(guān)控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
L6918ADTR 功能描述:DC/DC 開關(guān)控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
L6918D 功能描述:DC/DC 開關(guān)控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
L6918DTR 功能描述:DC/DC 開關(guān)控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
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