參數(shù)資料
型號(hào)： L6740L
廠商： STMICROELECTRONICS
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PQFP48
封裝： 7 X 7 MM, 1 MM HEIGHT, HTQFP-48
文件頁(yè)數(shù)： 21/44頁(yè)
文件大?。?/td> 755K
代理商： L6740L
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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L6741TR 功能描述:功率驅(qū)動(dòng)器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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L6743_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High current MOSFET driver
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