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參數(shù)資料
| 型號(hào)： | L6743Q |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | High current MOSFET driver |
| 中文描述： | 高電流MOSFET驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 7/17頁(yè) |
| 文件大?。?/td> | 282K |
| 代理商： | L6743Q |
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L6743, L6743Q
Device description and operation
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Device description and operation
L6743, L6743Q provides high-current driving control for both High-Side and Low-Side N-
Channel MOSFETS connected as Step-Down DC-DC Converter driven by an external PWM
signal. The integrated high-current drivers allow using different types of power MOSFETs
(also multiple MOS to reduce the equivalent RdsON), maintaining fast switching transition.
The driver for the High-Side MOSFET use BOOT pin for supply and PHASE pin for return.
The driver for the Low-Side MOSFET use the VCC pin for supply and PGND pin for return.
The Driver embodies a anti-shoot-through and adaptive dead-time control 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 about 2V, the Low-Side MOSFET gate drive voltage is suddenly
applied. When the Low-Side MOSFET turns off, the voltage at LGATE pin is sensed. When
it drops below about 1V, the High-Side MOSFET gate drive voltage is suddenly applied. If
the current flowing in the inductor is negative, the source of highside mosfet will never drop.
To allow the Low-Side MOSFET to turn-on even in this case, a watchdog controller is
enabled: if the source of the High-Side MOSFET doesn't drop, 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.
Before VCC to overcome the UVLO threshold, L6743, L6743Q keeps firmly-OFF both High-
Side and Low-Side MOSFETS then, after the UVLO has been crossed, the EN and PWM
inputs take the control over driver’s operations. EN pin enables the driver: if low will keep all
mosfet OFF (HiZ) regardless of the status of PWM. When EN is high, the PWM input takes
the control: if left floating, the internal resistor divider sets the HiZ State: both MOSFETS are
kept in the OFF state until PWM transition.
After UVLO crossing and while in HiZ, the Preliminary-OV protection is activated: if the
voltage senses through the PHASE pin overcomes about 1.8V, the Low-Side MOSFET is
latched ON in order to protect the load from dangerous over-voltage. The Driver status is
reset from a PWM transition.
Driver power supply as well as power conversion input are flexible: 5V and 12V can be
chosen for High-Side and Low-Side MOSFET voltage drive.
Figure 4.
Timing diagram (EN = High)
t
p
t
p
t
d
t
d
t
p
t
hold-off
HiZ Window
PWM
HS Gate
LS Gate
HiZ Window
H
t
hold-off
H
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6743QTR | 功能描述:功率驅(qū)動(dòng)器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6743TR | 功能描述:功率驅(qū)動(dòng)器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6747A | 制造商:STMicroelectronics 功能描述:MOSFET DRVR 3.5A 2-OUT Hi/Lo Side Inv/Non-Inv 8-Pin VFDFPN EP Tube 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Rail/Tube 制造商:STMicroelectronics 功能描述:N-Ch FET PWM Driver Dual 5V to 12V HC |
| L6747ATR | 功能描述:功率驅(qū)動(dòng)器IC Dual Mosfet Driver 5V to 12 V Flex Gate RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6747C | 制造商:STMicroelectronics 功能描述:MOSFET DRVR 3.5A 2-OUT Hi/Lo Side Inv/Non-Inv 8-Pin VFDFPN EP Tube 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Rail/Tube 制造商:STMicroelectronics 功能描述:N-Ch FET PWM Driver Dual 5V to 12V HC |
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