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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： | 26/44页 |
| 文件大小： | 755K |
| 代理商： | L6740L |
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Output voltage monitoring and protections
L6740L
–
Permanently sets the PWM of the non-involved section to HiZ while keeping
ENDRV of the non-involved section low in order to realize an HiZ condition of the
non-involved section.
–
Drives the OSC/ FLT pin high.
–
Power supply or EN pin cycling is required to restart operations.
The OV threshold needs to be programmed through the OVP pin. Connecting the OVP pin
to SGND through a resistor ROVP, the OVP threshold becomes the voltage present at the
pin. Since the OVP pin sources a constant IOVP=11 μA current, the programmed voltage
becomes:
=>
Filter OVP pin with 100 pF(max) to SGND.
7.2
Feedback disconnection
L6740L provides both CORE and NB sections with FB Disconnection protection. This fea-
ture acts in order to stop the device from regulating dangerous voltages in case the remote
sense connections are left floating. The protection is available for both the sections and
operates for both the positive and negative sense.
According to Figure 13, the protection works as follow:
●
CORE section:
Positive sense is performed monitoring the CORE output voltage through both VSEN
and CS1-. As soon as CS1- is more than 600 mV higher than VSEN, the device latches
with all PWMx set to HiZ and ENDRVx set to zero. FLT pin is driven high. A 30
μA
pull-down current on the VSEN forces the device to detect this fault condition.
Negative sense is performed monitoring the internal opamp used to recover the SGND
losses by comparing its output and the internal reference generated by the DAC. As
soon as the difference between the output and the input of this opamp is higher than
500 mV, the device latches with all PWMx set to HiZ and ENDRVx set to zero. FLT pin
is driven high.
●
NB section (SVI only)
Positive sense is performed sourcing a 50
μA current that pulls-up the NB_VSEN pin in
order to force the device to detect an OV condition for the NB section.
Negative sense is performed monitoring the internal opamp used to recover the SGND
losses by comparing its output and the internal reference generated by the DAC. As
soon as the difference between the output and the input of this opamp is higher than
500 mV, the device latches with all PWMx set to HiZ and ENDRVx set to zero. FLT pin
is driven high.
To recover from a latch condition, cycle VCC or EN.
OVP
TH
R
OVP
11
μA
=
R
OVP
TH
11
μA
--------------------
=
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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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