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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： | 24/44页 |
| 文件大小： | 755K |
| 代理商： | L6740L |
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Output voltage positioning
L6740L
6.10
Soft-start
L6740L implements a soft-start to smoothly charge the output filter avoiding high in-rush
currents to be required to the input power supply. In SVI mode, soft-start time is intended as
the time required by the device to set the output voltages to the Pre-PWROK Metal VID.
During this phase, the device increases the reference of the enabled section(s) from zero up
to the programmed reference in closed loop regulation. Soft-start is implemented only when
VCC is above UVLO Threshold and the EN pin is set free. See Section 5 for details about
the SVI interface and how SVC/SVD are interpreted in this phase.
At the end of the digital soft-start, PWRGOOD signal is set free.
Protections are active during this phase as follow:
–
Undervoltage is enabled when the reference voltage reaches 0.5 V.
–
Overvoltage is always enabled according to the programmed threshold (by ROVP).
–
FBDisconnection is enabled.
Reference is increased with fixed dV/dt; soft-start time depends on the programmed voltage
as follow:
Figure 12.
System start-up: SVI (left) and PVI (right)
6.10.1
LS-Less start-up
In order to avoid any kind of negative undershoot on the load side during start-up, L6740L
performs a special sequence in enabling the drivers for both sections: during the soft-start
phase, the LS MOSFET is kept OFF (PWMx set to HiZ and ENDRVx = 0) until the first PWM
pulse. After the first PWM pulse, the PWMx outputs switches between logic “0” and logic “1”
and ENDRVx are set to logic “1”.
This particular sequence avoids the dangerous negative spike on the output voltage that
can happen if starting over a pre-biased output especially when exiting from a CORE-OFF
state.
Low-Side MOSFET turn-on is masked only from the control loop point of view: protections
are still allowed to turn-ON the Low-Side MOSFET in case of overvoltage if needed.
T
SS ms
[]
Target_VID 2.56
=
VDD_CORE
PWRGOOD
EN
VDD_NB
VDD_CORE
PWRGOOD
EN
VDD_NB
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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