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參數(shù)資料
| 型號： | L6743 |
| 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)： | 8/17頁 |
| 文件大?。?/td> | 282K |
| 代理商： | L6743 |
Device description and operation
L6743, L6743Q
8/17
5.1
High-impedance (HiZ) management
The Driver is able to manage High-Impedance state by keeping all MOSFETs in off state in
two different ways.
If the EN signal is pulled low, the device will keep all mosfets OFF careless of the PWM
status.
When EN is asserted, if the PWM signal remains in the HiZ window for a time longer
than the hold-off time, the device detects the HiZ condition so turning off all the
MOSFETs. The HiZ window is defined as the PWM voltage range comprised between
V
PWM_IL
and V
PWM_IH
.
The device exits from the HiZ state only after a PWM transition to logic zero (V
PWM
<
V
PWM_IL
).
See
Figure 4
for details about HiZ timings.
●
●
The implementation of the High-Impedance state allows the controller that will be connected
to the driver to manage High-Impedance state of its output, avoiding to produce negative
undershoot on the regulated voltage during the shut-down stage. Furthermore, different
power management states may be managed such as pre-bias start-up.
5.2
Preliminary OV protection
After VCC has overcome its UVLO threshold and while in HiZ, L6743, L6743Q activates the
Preliminary-OV protection.
The intent of this protection is to protect the load especially from High-Side MOSFET
failures during the system start-up. In fact, VRM, and more in general PWM controllers, have
a 12V bus compatible turn-on threshold and results to be non-operative if VCC is below that
turn-on thresholds (that results being in the range of about 10V). In case of a High-Side
mosfet failure, the controller won’t recognize the over voltage until VCC = ~10V (unless
other special features are implemented): but in that case the output voltage is already at the
same voltage (~10V) and the load (CPU in most cases) already burnt.
L6743, L6743Q by-pass the PWM controller by latching on the Low-Side MOSFET in case
the PHASE pin voltage overcome
2V
during the HiZ state. When the PWM input exits form
the HiZ window, the protection is reset and the control of the output voltage is transferred to
the controller connected to the PWM input.
Since the Driver has its own UVLO threshold, a simple way to provide protection to the
output in all conditions when the device is OFF consists in supplying the controller through
the 5V
SB
bus: 5V
SB
is always present before any other voltage and, in case of High-Side
short, the Low-Side mosfet is driven with 5V assuring a reliable protection of the load.
Preliminary OV is active after UVLO and while the Driver is in HiZ state and it is disabled
after the first PWM transition. The controller will have to manage its output voltage from that
time on.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| L6743D | 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 |
| L6743DTR | 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 |
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