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參數(shù)資料
| 型號： | L6740LTR |
| 廠商： | 意法半導體 |
| 英文描述： | Hybrid controller (4+1) for AMD SVID and PVID processors |
| 中文描述： | 混合控制器（4 1對AMD SVID和PVID）處理器 |
| 文件頁數(shù)： | 31/44頁 |
| 文件大小： | 657K |
| 代理商： | L6740LTR |
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L6740L
Output voltage monitoring and protections
31/44
7
Output voltage monitoring and protections
L6740L monitors the regulated voltage of both sections through pin VSEN and NB_VSEN in
order to manage OV, UV and PWRGOOD. The device shows different thresholds when in
different operative conditions but the behavior in response to a protection event is still the
same as described below.
Protections are active also during soft-start (See
Section 6.10
) while they are masked dur-
ing OTF-VID transitions with an additional delay to avoid false triggering.
Table 12.
L6740L protection at a glance.
7.1
Programmable over voltage
Once VCC crosses the turn-ON threshold and the device is enabled (EN = 1), L6740L pro-
vides an Over Voltage Protection for both the sections: when the voltage sensed by VSEN
and/or NB_VSEN overcomes the OV threshold, the controller:
–
Permanently sets the PWM of the involved section to zero keeping ENDRV of that
section high in order to keep all the Low-Side MOSFETs on to protect the load of
the Section in OV condition.
Protection
Section
CORE
NORTH BRIDGE
Over voltage
(OV)
SVI / PVI:
Programmable threshold according to OVP pin.
V_FIX:
Fixed to 1.8V; OVP pin is externally shorted to SGND.
Action:
PWMx = 0 & ENDRVx = 1; Other Section (SVI only): PWMx = HiZ;
ENDRVx = 0; FLT driven High.
Under voltage
(UV)
VSEN, NB_VSEN = VID -400mV. Active after Ref > 500mV
Action:
All PWMx = HiZ; ENDRVx = 0; FLT Driven High.
PWRGOOD
PWRGOOD is the logic AND between internal CORE and NB PGOOD in SVI
mode while is the CORE section PGOOD in PVI mode.
Each PGOOD is set to zero when the related voltage falls below the
programmed reference -250mV.
Action:
Section(s) continue switching, PWRGOOD driven low.
VSEN, NB_VSEN
Disconnection
Set when VSEN > CS1- +600mV.
Action:
UV-Like
30
μ
A Pull-Up from NB_VSEN to set
OV (SVI Only).
Action:
OV-Like
FBG, NB_FBG
Disconnection
Internal Comparator across the opamp to recover from GND losses.
Action:
UV-Like
Over current (OC)
Current Monitor across Inductor DCR.
Dual Protection, per-phase and average.
Action:
UV-Like
Current Monitor across LS R
dsON
.
Constant Current, Valley CLimit.
Action:
UV-Like
On-The-Fly VID
Masked with the exception of OC with additional 16 clock delay to prevent from
false triggering (both SVI and PVI).
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| 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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