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參數(shù)資料
| 型號： | L6919CD |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | SO-28 |
| 文件頁數(shù)： | 2/32頁 |
| 文件大小： | 558K |
| 代理商： | L6919CD |
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L6919C
10/32
Figure 3. Soft Start
Figure 4. Drivers peak current: High Side (left) and Low Side (right)
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 VCCDRV pin for supply and PGND pin for return. A minimum voltage of 4.6V at VC-
CDRV pin is required to start operations of the device.
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. The dead time is reduced to few nanosec-
onds 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 mos-
fet even in this case, a watchdog 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 allows the system to regulate even if the current is negative.
VIN=VCCDR
VLGATEx
PGOOD
VOUT
t
2V
Turn ON threshold
2048 Clock Cycles
Timing Diagram
Acquisition:
CH1 = PGOOD; CH2 = VOUT; CH4 = LGATEx
CH3 = HGATE1; CH4 = HGATE2
CH3 = LGATE1; CH4 = LGATE2
相關PDF資料 |
PDF描述 |
|---|---|
| L6919E | SWITCHING CONTROLLER, PDSO28 |
| L6920DTR | 1.2 A SWITCHING REGULATOR, PDSO8 |
| L6920D | 1.2 A SWITCHING REGULATOR, PDSO8 |
| L6920 | 1.2 A SWITCHING REGULATOR, PDSO8 |
| L6924D013TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6919CDTR | 功能描述:DC/DC 開關控制器 Prog Dual-Phase Cont RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| L6919E | 功能描述:DC/DC 開關控制器 5-Bit Dual Ph Contlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| L6919ETR | 功能描述:DC/DC 開關控制器 5-Bit Dual Ph Contlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| L-692 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:Common Mode Inductor |
| L6920 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
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