參數(shù)資料
型號(hào)： L6712Q
廠商： STMICROELECTRONICS
元件分類(lèi)： 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(yè)數(shù)： 7/29頁(yè)
文件大?。?/td> 624K
代理商： L6712Q
15/29
L6712A L6712
then implemented allowing the device to recover if the over load cause has been removed.
■ L6712A - Fixed Maximum Duty Cycle Limitation
The maximum duty cycle is fixed and constant with the delivered current. The device works in constant
current operation once the OCP threshold has overcome. Refer to the above Constant Current section in
which only the different value in the maximum duty has to be considered as follow:
All the above reported relationships about the deliverable current once in quasi-constant current and con-
stant current are still valid in this case.
3.5 REMOTE SENSE AMPLIFIER
Remote Sense Amplifier is integrated in order to recover from losses across PCB traces and wiring in high
current DC/DC converter remote sense of the regulated voltage is required to maintain precision in the
regulation. The integrated amplifier is a low-offset error amplifier; external resistors are needed as shown
in Figure 11 to implement a differential remote sense amplifier.
Figure 11. Remote Sense Amplifier Connections
Equal resistors give to the resulting amplifier a unity gain: the programmed reference will be regulated
across the remote load.
To regulate output voltages different from the available references, the Remote Amplifier gain can be ad-
justed simply changing the value of the external resistors as follow (see Figure 11):
to regulate a voltage double of the reference, the above reported gain must be equal to .
Modifying the Remote Amplifier Gain (in particular with values higher than 1) allows also to regulate volt-
ages lower than the programmed reference.
Since this Amplifier is connected as a differential amplifier, when calculating the offset introduced
in the regulated output voltage, the "native" offset of the amplifier must be multiplied by the term
KOS = [1+(1/RA_Gain)] because a voltage generator insisting on the non-inverting input represents
the offset.
If remote sense is not required, it is enough connecting RFB directly to the regulated voltage: VSEN be-
comes not connected and still senses the output voltage through the remote amplifier. In this case the use
of the external resistors R1 and R2 becomes optional and the Remote Sense Amplifier can simply be con-
nected as a "buffer" to keep VSEN at the regulated voltage (See Figure 11). Avoiding use of Remote Am-
plifier saves its offset in the accuracy calculation but doesn't allow remote sensing.
I
peak
I
OCPx
V
IN
Vout
min
–
L
-------------------------------------- Ton
MAX
I
OCPx
V
IN
Vout
MIN
–
L
--------------------------------------- 0.85 T
+
=
+
=
Reference
IDROOP
REMOTE
AMPLIFIER
ERROR
AMPLIFIER
DROOP
FB
COMP
VSEN
FBG
FBR
Remote
Ground
Remote
VOUT
RF
CF
RFB
R2
R1
Reference
IDROOP
REMOTE
AMPLIFIER
ERROR
AMPLIFIER
DROOP
FB
COMP
VSEN
FBG
FBR
VOUT
RF
CF
RFB
RB used
RB Not Used
RA_Gain
V
VSEN
Remote_V
OUT
Remote_GND
–
----------------------------------------------------------------------------------------
=
R2
R1
--------
=
相關(guān)PDF資料
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L6712大電流DCDC轉(zhuǎn)換器 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:
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