參數(shù)資料
型號： LTC4252-1IMS8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： TRANS ARRAY NPN/NPN SSMINI-6
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝： PLASTIC, MSOP-8
文件頁數(shù)： 23/32頁
文件大?。?/td> 327K
代理商： LTC4252-1IMS8
LTC4252-1/LTC4252-2
23
425212f
APPLICATIU
W
U
U
Figure 11. Undervoltage Timing with an Overvoltage Glitch (All Waveforms are Referenced to V
EE
)
UV/OV
TIMER
GATE
SENSE
SS
DRAIN
PWRGD
5.8
μ
A
58
μ
A
58
μ
A
5.8
μ
A
5.8
μ
A
UV/OV CLEARS V
UVHI
, CHECK OV CONDITION, GATE < V
GATEL
, SENSE < V
CB
, SS < 20 V
OS
AND TIMER < V
TMRL
UV/OV OVERSHOOTS V
OVHI
AND TIMER ABORTS INITIAL TIMING CYCLE
1
2
3
4 5 67
8
9
TIMER CLEARS V
TMRL
, CHECK GATE < V
GATEL
, SENSE < V
CB
AND SS < 20 V
OS
101112
4252-1/2 F11
UV/OV DROPS BELOW V
OVLO
AND TIMER RESTARTS INITIAL TIMING CYCLE
V
ACL
V
CB
230
μ
A + 8 I
DRN
20 V
OS
V
IN
– V
GATEH
V
DRNL
V
DRNCL
20 (V
CB
+ V
OS
)
20 (V
ACL
+ V
OS
)
V
GATEL
V
TMRL
V
TMRH
V
OVHI
V
UVHI
V
OVLO
GATE
START-UP
INITIAL TIMING
threshold. The initial timing cycle restarts, followed by a
GATE start-up cycle.
Overvoltage Timing
During normal operation, if the OV pin exceeds V
OVHI
as
shown at time point 1 of Figure 12, the TIMER and PWRGD
status are unaffected. Nevertheless, SS and GATE pull
down and the load is disconnected. At time point 2, OV
recovers and drops below the V
OVLO
threshold. A GATE
start-up cycle begins. If the overvoltage glitch is long
enough to deplete the load capacitor, a full start-up cycle
as shown between time points 4 through 7 may occur.
Circuit Breaker Timing
In Figure 13a, the TIMER capacitor charges at 230
μ
A if the
SENSE pin exceeds V
CB
but V
DRN
is less than 6.15V. If the
SENSE pin drops below V
CB
before TIMER reaches the
V
TMRH
threshold, TIMER is discharged by 5.8
μ
A. In Figure
13b, when TIMER exceeds V
TMRH
, GATE pulls down
immediately and the LTC4252 shuts down. In Figure 13c,
multiple momentary faults cause the TIMER capacitor to
integrate and reach V
TMRH
. GATE pull down follows and
the LTC4252 shuts down. During shutdown, the LTC4252-1
latches TIMER high with a 5.8
μ
A pull-up current source;
the LTC4252-2 activates a shutdown cooling cycle.
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