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參數(shù)資料
| 型號： | L6711TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, TQFP-48 |
| 文件頁數(shù)： | 33/50頁 |
| 文件大?。?/td> | 679K |
| 代理商： | L6711TR |
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L6711
Driver section
39/50
16
Driver section
The integrated high-current drivers allow using different types of power MOS (also multiple
MOS to reduce the equivalent 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 VCCDRx pin for supply and PGNDx pin for
return. A minimum voltage of 4.6V at VCCDRx pin is required to start operations of the
device. VCCDRx pins must be connected together.
The controller embodies a sophisticated anti-shoot-through system to minimize low side
body diode conduction time maintaining good efficiency saving the use of Schottky diodes:
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 suddenly applied. 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 suddenly applied.
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 watchdog controller
is enabled: if the source of the high-side mosfet doesn'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 allows the system to regulate even if the current is negative.
The BOOTx and VCCDRx pins are separated from IC's power supply (VCC pin) as well as
signal ground (SGND pin) and power ground (PGNDx pin) in order to maximize the
switching noise immunity. The separated 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 application.
Power conversion input is also flexible; 5V, 12V bus or any bus that allows the conversion
(See maximum duty cycle limitations) can be chosen freely.
16.1
Power dissipation
Two main terms contribute in the device power dissipation: bias power and drivers' power.
The first one depends on the static consumption of the device through the supply pins and it
is simply quantifiable as follow:
PDC = VCC (ICC + 3 ICCDRx + 3 IBOOTx)
Drivers' power is the power needed by the driver to continuously switch on and off the
external mosfets; it is a function of the switching frequency and total gate charge of the
selected mosfets. It can be quantified considering that the total power PSW dissipated to
switch the mosfets (easy calculable) is dissipated by three main factors: external gate
resistance (when present), intrinsic mosfet resistance and intrinsic driver resistance. This
last term is the important one to be determined to calculate the device power dissipation.
The total power dissipated to switch the mosfets results:
PSW = 3 (QG_HS VBOOT + QG_LS VCCDR) FSW
External gate resistors helps the device to dissipate the switching power since the same
power PSW will be shared between the internal driver impedance and the external resistor
resulting in a general cooling of the device.It is important to determine the device dissipated
power in order to avoid the junction working beyond its maximum operative temperature.
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| L6711 | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6712 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| 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 |
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