參數(shù)資料
型號： L6712QTR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, QCC36
封裝： 6 X 6 MM, 1 MM HEIGHT, VFQFPN-36
文件頁數(shù)： 13/29頁
文件大小： 624K
代理商： L6712QTR
L6712A L6712
20/29
Figure 16. Main Control Loop Diagram
3.12.1Current Sharing (CS) Control Loop
Active current sharing is implemented using the information from Trans conductance differential amplifier.
A current reference equal to the average of the read current (IAVG) 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 Figure 17).
The current sharing control is a high bandwidth control loop 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
offset of Trans conductance differential amplifier; considering a voltage offset equal to 2mV across the
sense resistor, the current reading error is given by the following equation:
Figure 17. Current Sharing Control Loop.
L1
L2
+
PWM1
1/5
+
-
1/5
IINFO2
IINFO1
4/5
ZF(S)
PWM2
CO
FB
COMP
RO
ERROR
AMPLIFIER
REFERENCE
PROGRAMMED
BY VID
CURRENT
SHARING
DUTY CYCLE
CORRECTION
RFB
D03IN1518
RA_Gain
I
READ
I
MAX
--------------------
2mV
R
SENSE
I
MAX
----------------------------------------
=
L1
L2
+
PWM1
1/5
IINFO2
IINFO1
PWM2
COMP
VOUT
CURRENT
SHARING
DUTY CYCLE
CORRECTION
D02IN1393
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