參數(shù)資料
型號(hào)： L6918AD
廠商： 意法半導(dǎo)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(yè)數(shù)： 21/35頁(yè)
文件大小： 760K
代理商： L6918AD
21/35
L6918 L6918A
MAIN CONTROL LOOP
The four phases control loop is composed by two dual phases devices that are independent each other. So, the
compensation network and the control loop stability of each device don't depend on the other except for the fact
that the other converter represents a load for this one.
The L6918/A control loop is composed by the Current Sharing control loop and the Average Current Mode con-
trol loop. Each loop gives, with a proper gain, the correction to the PWM in order to minimize the error in its
regulation: the Current Sharing control loop equalize the currents in the inductors while the Average Current
Mode control loop fixes the output voltage equal to the reference programmed by VID. Figure 12 reports the
block diagram of the main control loop
Figure 12. Main Control Loop Diagram
CURRENT SHARING (CS) CONTROL LOOP
The devices are configured to work in a four synchronized phase application. Since the application is composed
by two-phase devices that share reference and synchronization signals, the current sharing between the phases
is realized in two different steps:
1. Sharing between the phases of the same device;
2. Sharing between devices.
The Current Sharing between phases of the same device uses the internal current information to correct the
PWM signal in order to equalize the current. Active current sharing is implemented using the information from
Tran conductance differential amplifier in an average current mode control scheme. A current reference equal
to the average of the read current (I
AVG
) is internally built; the error between the read current and this reference
is converted to a voltage with a proper gain and it is used to adjust the duty cycle whose dominant value is set
by the error amplifier at COMP pin (See fig. 13).
The current sharing control is a high bandwidth control allowing current sharing even during load transients.
The current sharing error is affected by the choice of external components; choose precise Rg resistor (±1% is
necessary) to sense the current. The current sharing error is internally dominated by the voltage mismatch of
Tran conductance differential amplifier between phases; considering a voltage mismatch equal to 2mV across
the sense resistor, the current reading error is given by the following equation:
Where
I
READ
is the difference between one phase current and the ideal current (I
MAX/2
).
For Rsense=4m
and Imax=40A the current sharing error is equal to 2.5%, neglecting errors due to Rg and
Rsense mismatches.
L1
L2
+
+
PWM1
1/5
+
-
1/5
I
INFO2
I
INFO1
4/5
Z
F(S)
PWM2
C
O
FB
COMP
R
O
ERROR
AMPLIFIER
REFERENCE
PROGRAMMED
BY VID
CURRENT
SHARING
DUTY CYCLE
CORRECTION
R
FB
D02IN1392
I
MAX
-------------------
SENSE
MAX
--------------------------------------
=
相關(guān)PDF資料
PDF描述
L6918ADTR 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918D 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918DTR 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6919C 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
L6919CD 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(fēng)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(fēng)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(fēng)格: 封裝 / 箱體:CPAK
L6919 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
L6919C 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
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