參數(shù)資料
型號： LTC3816IUHF#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PQCC38
封裝： 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38
文件頁數(shù)： 13/44頁
文件大?。?/td> 753K
代理商： LTC3816IUHF#TRPBF
LTC3816
0
3816f
applicaTions inForMaTion
NotethatthevalueofRDCRmustaccountforitstemperature
coefficient, which is approximately 0.39%/°C.
The current limit architecture of the LTC3816 allows short
durations of instantaneous overload. Upon power-up, the
current limit threshold is set to 1
×, equal to ILIMIT. The
load is limited to ILIMIT until the switcher output reaches
its VBOOT potential. Beyond this point, during the VID DAC
slewing interval, the IMAX sourcing current automatically
switchesfrom10Ato20Aandthecurrentlimitthreshold
increases to 2
× to enable the output capacitor voltage to
track the DAC transition. If the controller detects that there
is an overload condition when the DAC is not slewing, the
current limit threshold increases to 2
× for a duration of
45s. If the overload interval is shorter than 45s, the IC
allows another overcurrent event within the next 630s,
as shown in Figure 6a. However, if an overload occurs
withinthe630sfollowingthesecondevent,thecontroller
current limits, as shown in Figure 6b.
If the overload condition persists for more than 45s,
the LTC3816 allows the 2
× current limit to continue for
CURRENT LIMITED
20A
10A
ILOAD
2
45s
<45s
<630s
1
IIMAX
45s
<45s
3816 F06a
>630s
Figure 6a. Permissible Overload
CURRENT LIMITED
20A
10A
ILOAD
2
45s
<45s
<630s
1
IIMAX
45s
<45s
3816 F06b
Figure 6b. Repeated Overload Triggers Current Limit
anothercycle.After90s,theIMAXcurrentreturnsto10A,
and the output load is limited to 1
× for the next 630s as
shown in Figure 6c. Figure 6d shows the condition when
a repetitive overload event triggers current limit.
Figure 6e shows that at any instant, if the load current
is above 1
× for more than 90s, or higher than 2×, the
controllerenterscurrentlimit.Underthiscondition,theTG
duty cycle is reduced and the SS capacitor is discharged
CURRENT LIMITED
20A
10A
ILOAD
2
90s
1
IIMAX
<45s
3816 F06c
45s < t < 90s
45s
>630s
Figure 6c. Allowable Longer Overload Condition
CURRENT LIMITED
20A
10A
ILOAD
2
90s
1
IIMAX
<45s
3816 F06d
45s < t < 90s
<630s
Figure 6d. Allowable Longer Overload Condition,
Followed by Repeated Overload Triggers Current Limit
CURRENT LIMITED
20A
10A
ILOAD
2
90s
>90s
1
IIMAX
45s
<45s
3816 F06e
>630s
Figure 6e. Long Overload or Excessive Loading
Triggers Current Limit Condition
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