參數(shù)資料
型號(hào)： L6722
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, QCC36
封裝： 6 X 6 MM, 1 MM PITCH, VFQFPN-36
文件頁(yè)數(shù)： 9/34頁(yè)
文件大?。?/td> 421K
代理商： L6722
Obsolete
Product(s)
- Obsolete
Product(s)
L6722
7 Output voltage positioning
17/34
7
Output voltage positioning
Output voltage positioning is performed by programming the external resistor divider and by
correctly designing Droop Function and Offset to the reference (Optional). The output voltage is
then driven by the following relationship (See Figure 7):
Both DROOP and OFFSET function can be disabled: see Section 7.1 and Section 7.2 for
details.
L6722 embeds a Remote Sense Buffer to sense remotely the regulated voltage without any
additional external components. In this way, the output voltage programmed is regulated
between the remote buffer inputs compensating for board and connector losses. The device
senses the output voltage remotely through the pins FBR and FBG (FBR is for the regulated
voltage sense while FBG is for the ground sense) and reports this voltage internally at VSEN
pin with unity gain eliminating the errors. Keeping the FBR and FBG traces parallel and
guarded by a power plane results in common mode coupling for any picked-up noise.
When regulating output voltages higher than the reference, it is possible to insert a resistor
divider between FBR, FBG and the regulated voltage as reported in Figure 7. In this case it is
important for the external divider to have a value negligible with respect to the remote buffer
impedance that has 64k resistors.
Figure 7.
Voltage positioning
7.1
Offset and margining-mode (optional)
Positive / negative offset can be added to the programmed reference by connecting proper
network resistor between the REF_OUT and REF_IN pins. In this way is possible to manage
margining-mode by adding small offsets (positive or negative) to the regulated voltage, in order
to test the loading-circuitry in different operative conditions to check for the reliability of the
system designed.
Referring to Figure 8, a constant current (IOS=12A) is sourced from the REF_IN pin as soon
as the device is enabled. By correctly designing ROS1 and ROS2, positive and negative offset
may be added to the reference voltage according to the status of the control signals M1 and
M2. Different operating conditions can be then considered:
V
OUT
Ref
()
R1
R2
+
R2
----------------------
=
To Vout
(Remote Sense)
I DR
OOP
Ref
FB
COMP
VSEN
64k
FBR
FBG
64k
RF
CF
RFB
REF_IN
REF_OUT
I OS
ROS
COS
R1
R2
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6722TR 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3 Phase Controller 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
L6725 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Vltg Mode PWM Controller 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
L6725_07 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Voltage mode PWM controller with bootstrap anti-discharging system
L6725A 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Vltg Mode PWM Controller 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
L6725ATR 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Step-Down Controller 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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