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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： | 21/44页 |
| 文件大小： | 755K |
| 代理商： | L6740L |
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Output voltage positioning
L6740L
Caution:
Offset implementation is optional, in case it is not desired, simply short the pin to SGND.
Note:
In the above formulas, RFB_NB has to be considered being the total resistance connected
between NB_FB pin and the regulated voltage.
6.8
NB section - maximum duty-cycle limitation
To provide proper time for current-reading across the low-side MOSFET, the device imple-
ments a duty-cycle limitation for the NB section. This limitation is not fixed but it is linearly
variable with the current delivered to the load as follow:
duty cycle limitation is variable with the delivered current to provide fast load transient
response at light load as well as assuring robust over-current protection.
6.9
On-the-fly VID transitions
L6740L manages on-the-fly VID transitions that allow the output voltage of both sections to
modify during normal device operation for CPU power management purposes. OV, UV and
PWRGOOD signals are masked during every OTF-VID Transition and they are re-activated
with a 16 clock cycle delay to prevent from false triggering.
When changing dynamically the regulated voltage (OTF-VID), the system needs to charge
or discharge the output capacitor accordingly. This means that an extra-current IOTF-VID
needs to be delivered (especially when increasing the output regulated voltage) and it must
be considered when setting the over-current threshold of both the sections. This current
results:
where dVOUT / dTVID depends on the operative mode (3 mV/μsec. in SVI or externally driven
in PVI).
Overcoming the OC threshold during the dynamic VID causes the device latch and disable.
Dynamic VID transition is managed in different ways according to the device operative
mode:
●
PVI mode.
L6740L checks for VID code modifications (See Figure 11) on the rising-edge of an
internal additional OTFVID-clock and waits for a confirmation on the following falling
edge. Once the new code is stable, on the next rising edge, the reference starts
stepping up or down in LSB increments every two OTFVID-clock cycle until the new
VID code is reached. During the transition, VID code changes are ignored; the device
R
OS_NB
1.240V
V
OS_NB
-------------------- R
FB_NB
=
T
ON_NB(max)
0.80 T
SW
I
NB_ISEN
0
μA
=
0.40 T
SW
I
NB_ISEN
35
μA
=
=
I
OTF-VID
C
OUT
dV
OUT
dT
VID
------------------
=
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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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