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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： | 29/44页 |
| 文件大小： | 755K |
| 代理商： | L6740L |
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L6740L
Output voltage monitoring and protections
rent operation since the current ripple increases. In fact, the ON time increases due to the
OFF time rise because of the current has to reach the IOCP_NB bottom. The worst-case con-
dition is when the ON time reaches its maximum value (see Section 6.8). When this hap-
pens, the section works in real constant current and the output voltage decrease as the load
increase. Crossing the UV threshold causes the device to latch accordingly.
It can be observed that the peak current (IPEAK_NB) is greater than IOCP_NB but it can be
determined as follow:
Where VOUT(min) is the UV threshold, (inductor saturation must be considered). When that
threshold is crossed, UV is detected. Cycle the power supply or the EN pin to restart opera-
tion.
The maximum average current during the constant-current behavior results (see Figure 14):
in this particular situation, the switching frequency for the NB section results reduced. The
ON time is the maximum allowed TON(max) while the OFF time depends on the application:
The trans conductance resistor RISEN can be designed considering that the section limits
the inductor current ripple valley. Moreover the additional current due to the output filter
charge during on-the-fly VID transitions must be considered.
where IOCP_NB is defined above.
Figure 14.
NB section - constant current operation
I
PEAK_NB
I
OCP_NB
V
IN
V
OUT(min)
–
L
NB
--------------------------------------- T
ON(max)
+
I
OCP_NB
V
IN
V
OUT(min)
–
L
NB
--------------------------------------- 0.40 T
SW
+
==
I
MAX_NB
I
OCP_NB
I
PEAK
I
OCP_NB
–
2
------------------------------------------
+
=
T
OFF
L
NB
I
PEAK
I
OCP_NB
–
V
OUT
------------------------------------------
=
f
1
T
ON(max)
T
OFF
+
-------------------------------------------
=
R
ISEN
I
OCP_NB(max)
R
dsON(max)
I
OCTH_NB(min)
-----------------------------------------------------------------
=
VOUT
0.40 VIN
Constant Current (Exploded)
IOCP_NB
(IDROOP_NB = 35μA)
IOUT
UVP Threshold
Voltage Positioning
IMAX_NB
Droop Effect
Quasi-Const.
Current
TON(max)
IOCP_NB
IMAX_NB
IPEAK_NB
LS ON Skipping
Clock Cycles
TSW
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相关代理商/技术参数 |
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| 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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