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參數(shù)資料
| 型號： | L6712 |
| 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)： | 14/27頁 |
| 文件大?。?/td> | 1074K |
| 代理商： | L6712 |
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L6712A L6712
14/27
centage with respect to the load value, it can be simply considered that, for example, to have on OCP
threshold of 200%, this will correspond to I
INFOx
= 35
μ
A (I
FB
= 70
μ
A). The full load current will then corre-
spond to I
INFOx
= 17.5
μ
A (IFB = 35
μ
A).
Once the UVP threshold has been intercepted, the device resets with all power mosfets turned OFF. An-
other soft start is then performed allowing the device to recover from OCP once the over load cause has
been removed.
Crossing the UVP threshold causes the device to reset: all mosfets are turned off and a new soft start is
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.
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 7 to implement a differential remote sense amplifier.
Figure 7. 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 7):
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
I
peak
I
OCPx
V
-----------–
Ton
MAX
Vout
L
I
OCPx
V
-----------–
0.85 T
Vout
L
+
=
+
=
Reference
I
DROOP
REMOTE
AMPLIFIER
ERROR
AMPLIFIER
DROOP
FB
COMP
VSEN
FBG
FBR
Remote
Ground
Remote
V
OUT
R
F
C
F
R
FB
R2
R2
R1
R1
Reference
I
DROOP
REMOTE
AMPLIFIER
ERROR
AMPLIFIER
DROOP
FB
COMP
VSEN
FBG
FBR
V
OUT
R
F
C
F
R
FB
RB used
RB Not Used
RA_Gain
V
–
Remote_V
OUT
Remote_GND
----------------------------------------------------------------------------------------
=
R1
-------
=
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| L6712AD | 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 |
| L6712ADTR | 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 |
| L6712AQ | 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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