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參數(shù)資料
| 型號： | L6712A |
| 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)： | 15/27頁 |
| 文件大小： | 1074K |
| 代理商： | L6712A |
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L6712A L6712
in the regulated output voltage, the "native" offset of the amplifier must be multiplied by the term
K
OS
= [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 R
FB
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 7). Avoiding use of Remote Am-
plifier saves its offset in the accuracy calculation but doesn't allow remote sensing.
INTEGRATED DROOP FUNCTION (Optional)
Droop function realizes dependence between the regulated voltage and the delivered current (Load Reg-
ulation). In this way, a part of the drop due to the output capacitor ESR in the load transient is recovered.
As shown in Figure 8, the ESR drop is present in any case, but using the droop function the total deviation
of the output voltage is minimized.
Connecting DROOP pin and FB pin together, forces a current I
DROOP
, proportional to the output current,
into the feedback resistor R
FB
implementing the load regulation dependence. If RA_Gain is the Remote
Amplifier gain, the Output Characteristic is then given by the following relationship (when droop enabled):
with a remote amplifier gain of 1/2, the regulated output voltage results in being doubled.
The Droop current is equal to 50
μ
A at nominal full load and 70
μ
A at the OC intervention threshold, so the
maximum output voltage deviation is equal to:
Droop function is provided only for positive load; if negative load is applied, and then I
INFOx
<0, no current
is sunk from the FB pin. The device regulates at the voltage programmed by the VID.
If this effect is not desired, shorting DROOP pin to SGND, the device regulates as a Voltage Mode Buck
converter.
Figure 8. Load Transient response (Left) and DROOP pin connection (Right).
MONITOR AND PROTECTIONS
The device monitors through pin VSEN the regulated voltage in order to build the PGOOD signal and man-
age the OVP / UVP conditions.
■
PGOOD.
Power good output is forced low if the voltage sensed by VSEN is not within ±12% (Typ.) of
the programmed value (RA_Gain=1). It is an open drain output and it is enabled only after the soft start
V
OUT
RA_Gain
------------------------
VID
R
FB
I
DROOP
–
(
)
RA_Gain
------------------------
VID
R
FB
R
Rg
----------------------
I
OUT
–
=
=
V
FULL
POSITIVE
–
LOAD
–
RA_Gain
------------------------
R
FB
50
μ
A
V
OC
INTERVENTION
–
RA_Gain
------------------------
R
FB
70
μ
A
–
=
–
=
V
MAX
V
MIN
V
NOM
ESR DROP
DROOP PIN = GND
DROOP PIN = FB PIN
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
Short to GND if DROOP function is not
implemented (Classic Voltage Mode).
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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 |
| L6712AQTR | 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 |
| L6712D | 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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