參數(shù)資料
型號(hào): LTC4252-1
廠商: Linear Technology Corporation
英文描述: TRANS ARRAY NPN/PNP SS MINI-6P
中文描述: 負(fù)電壓熱插拔控制器
文件頁(yè)數(shù): 20/32頁(yè)
文件大?。?/td> 327K
代理商: LTC4252-1
LTC4252-1/LTC4252-2
20
425212f
APPLICATIU
W
U
U
GND – V
OR
(–48RTN) – (–48V)
UV/OV
V
IN
TIMER
GATE
V
LKO
SENSE
V
IN
CLEARS V
LKO
, CHECK UV > V
UVHI
, OV < V
OVLO
, GATE < V
GATEL
, SENSE < V
CB
, SS < 20 V
OS
AND TIMER < V
TMRL
V
OUT
1
2
3 4 56
7
8
V
ACL
V
CB
9
TIMER CLEARS V
TMRL
, CHECK GATE < V
GATEL
, SENSE < V
CB
AND SS < 20 V
OS
SS
DRAIN
PWRGD
230
μ
A + 8 I
DRN
5.8
μ
A
20 V
OS
58
μ
A
1011
V
IN
– V
GATEH
V
DRNL
V
DRNCL
20 (V
CB
+ V
OS
)
20 (V
ACL
+ V
OS
)
V
GATEL
V
TMRL
V
TMRH
5.8
μ
A
5.8
μ
A
58
μ
A
4252-1/2 F08
GATE
START-UP
INITIAL TIMING
Figure 8. System Power-Up Timing (All Waveforms are Referenced to V
EE
)
V
ACL
(t) (Equation 7) and soft-start limits the slew rate of
the load current. If the SENSE voltage (V
SENSE
– V
EE
)
reaches the V
CB
threshold at time point 7, the circuit
breaker TIMER activates. The TIMER capacitor, C
T
, is
charged by a (230
μ
A + 8 I
DRN
) current pull-up. As the load
capacitor nears full charge, load current begins to decline.
At time point 8, the load current falls and the SENSE
voltage drops below V
ACL
(t). The analog current limit loop
shuts off and the GATE pin ramps further. At time point 9,
the SENSE voltage drops below V
CB
, the fault TIMER cycle
ends, followed by a 5.8
μ
A discharge cycle (cool off). The
duration between time points 7 and 9 must be shorter than
one circuit breaker delay to avoid a fault time out during
GATE ramp-up. When GATE ramps past the V
GATEH
thresh-
old at time point 10, PWRGD pulls low. At time point11,
GATE reaches its maximum voltage as determined by V
IN
.
Live Insertion with Short Pin Control of UV/OV
In the example shown in Figure 9, power is delivered
through long connector pins whereas the UV/OV divider
makes contact through a short pin. This ensures the power
connections are firmly established before the LTC4252 is
activated. At time point 1, the power pins make contact and
相關(guān)PDF資料
PDF描述
LTC4252 Negative 48V Hot Swap Controller
LTC4252-1CMS TRANS ARRAY PNP/PNP SS MINI-6P
LTC4252-1CMS8 TRANS ARRAY NPN/NPN SSMINI-6
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