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参数资料
| 型号： | L6740L |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, HTQFP-48 |
| 文件页数： | 25/44页 |
| 文件大小： | 755K |
| 代理商： | L6740L |
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L6740L
Output voltage monitoring and protections
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 overvoltage
Once VCC crosses the turn-ON threshold and the device is enabled (EN = 1), L6740L pro-
vides an overvoltage 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
Overvoltage
(OV)
SVI / PVI: Programmable threshold according to OVP pin.
V_FIX: Fixed to 1.8 V; OVP pin is externally shorted to SGND.
Action: PWMx = 0 and ENDRVx = 1; Other section (SVI only): PWMx = HiZ;
ENDRVx = 0; FLT driven High.
Under voltage
(UV)
VSEN, NB_VSEN = VID -400 mV. Active after Ref > 500 mV
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- +600 mV.
Action: UV-Like
30
μA 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 RDS(on).
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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相关代理商/技术参数 |
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| L6740LTR | 功能描述:DC/DC 开关控制器 Hybrid controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6741 | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6741TR | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6743 | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6743_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:High current MOSFET driver |
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