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參數(shù)資料
| 型號： | L6741 |
| 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)動器 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 265K |
| 代理商： | L6741 |
L6741
Device description and operation
7/16
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Device description and operation
L6741 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.
L6741 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 external 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 overcome the UVLO threshold, L6741 keeps firmly-OFF both High-Side and
Low-Side MOSFETS then, after the UVLO has crossed, the PWM input keeps the control of
the driver operations. If the PWM input is left floating, the internal resistor divider sets the
HiZ: 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 overcome about 2V, 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: every combination of 5V
and 12V can be chosen for High-Side and Low-Side MOSFET voltage drive. Furthermore,
5V, 12V bus or any intermediate bus that allows the conversion can be chosen freely.
Figure 4.
Timing diagram
t
p
t
p
t
d
t
d
t
p
t
p
t
hold-off
HiZ Window
PWM
HS Gate
LS Gate
HiZ Window
H
t
hold-off
H
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| L6741TR | High current MOSFET driver |
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| L6743Q | High current MOSFET driver |
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| L6919ETR | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6741TR | 功能描述:功率驅(qū)動器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 |
| L6743 | 功能描述:功率驅(qū)動器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 |
| L6743_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High current MOSFET driver |
| L6743B | 功能描述:功率驅(qū)動器IC Hi-current MOSFET Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 |
| L6743BTR | 功能描述:功率驅(qū)動器IC HIGH CURRENT MOSFET DRIVER DC-DC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 |
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