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參數(shù)資料
| 型號： | L6712Q |
| 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)： | 3/29頁 |
| 文件大?。?/td> | 624K |
| 代理商： | L6712Q |
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L6712A L6712
3.3 DRIVER SECTION
The integrated high-current drivers allow using different types of power MOS (also multiple MOS to reduce
the RdsON), maintaining fast switching transition.
The drivers for the high-side mosfets use BOOTx pins for supply and PHASEx pins for return. The drivers
for the low-side mosfets use VCCDR pin for supply and PGND pin for return. A minimum voltage of 4.6V
at VCCDR pin is required to start operations of the device.
The controller embodies a sophisticated anti-shoot-through system to minimize low side body diode con-
duction time maintaining good efficiency saving the use of Schottky diodes in parallel to the LS mosfets.
The dead time is reduced to few nanoseconds assuring that high-side and low-side mosfets are never
switched on simultaneously: when the high-side mosfet turns off, the voltage on its source begins to fall;
when the voltage reaches 2V, the low-side mosfet gate drive is applied with 30ns delay. When the low-
side mosfet turns off, the voltage at LGATEx pin is sensed. When it drops below 1V, the high-side mosfet
gate drive is applied with a delay of 30ns. If the current flowing in the inductor is negative, the source of
high-side mosfet will never drop. To allow the turning on of the low-side mosfet even in this case, a watch-
dog controller is enabled: if the source of the high-side mosfet don't drop for more than 240ns, the low side
mosfet is switched on so allowing the negative current of the inductor to recirculate. This mechanism al-
lows the system to regulate even if the current is negative.
The BOOTx and VCCDR pins are separated from IC's power supply (VCC pin) as well as signal ground
(SGND pin) and power ground (PGND pin) in order to maximize the switching noise immunity. The sepa-
rated supply for the different drivers gives high flexibility in mosfet choice, allowing the use of logic-level
mosfet. Several combination of supply can be chosen to optimize performance and efficiency of the appli-
cation. Power conversion is also flexible; 5V or 12V bus can be chosen freely.
The peak current is shown for both the upper and the lower driver of the two phases in Figure 7. A 10nF
capacitive load has been used. For the upper drivers, the source current is 1.9A while the sink current is
1.5A with VBOOT -VPHASE = 12V; similarly, for the lower drivers, the source current is 2.4A while the sink
current is 2A with VCCDR = 12V.
Figure 7. Drivers peak current: High Side (left) and Low Side (right)
3.4 CURRENT READING AND OVER CURRENT
The current flowing trough each phase is read using the voltage drop across the low side mosfets RdsON
or across a sense resistor (RSENSE) in series to the LS mosfet and internally converted into a current. The
transconductance ratio is issued by the external resistor Rg placed outside the chip between ISENx and
PGNDSx pins toward the reading points. The differential current reading rejects noise and allows to place
sensing element in different locations without affecting the measurement's accuracy. The current reading
CH3 = HGATE1; CH4 = HGATE2
CH3 = LGATE1; CH4 = LGATE2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6712QTR | 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 |
| L6712大電流DCDC轉(zhuǎn)換器 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| L6713A | 功能描述:DC/DC 開關(guān)控制器 2/3 Phase controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| L6713A_0805 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2/3/4 phase controller with embedded drivers for Intel VR11.1 |
| L6713ATR | 功能描述:DC/DC 開關(guān)控制器 2/3 Phase controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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