參數(shù)資料
型號: LTC4252A-1IMS#TRPBF
廠商: Linear Technology
文件頁數(shù): 22/36頁
文件大小: 328K
描述: IC CNTRLR HOTSWAP NEGVOLT 10MSOP
標(biāo)準(zhǔn)包裝: 2,500
類型: 熱交換控制器
應(yīng)用: 通用
內(nèi)部開關(guān):
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 10-MSOP
包裝: 帶卷 (TR)
LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
22
425212fe
For more information www.linear.com/LTC4252-1
applicaTions inForMaTion
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礎(chǔ) 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 point?1,
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 10, 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 V
IN
 ramps through V
LKO
. At time point 2, the UV/OV
divider makes contact and its voltage exceeds V
UVHI
. In
addition, the internal logic checks for OV < V
OVHI
, GATE
< V
GATEL
,
 
SENSE < V
CB
, SS < 20 " V
OS
 and TIMER <
V
TMRL
. If all conditions are met, an initial timing cycle
starts and the TIMER capacitor is charged by a 5.8礎(chǔ)
current source pull-up. At time point 3, TIMER reaches the
V
TMRH
 threshold and the initial timing cycle terminates.
The TIMER capacitor is quickly discharged. At time point
4, the V
TMRL
 threshold is reached and the conditions of
GATE < V
GATEL
, SENSE < V
CB
and SS < 20 " V
OS
 must be
GND  V
EE
 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礎(chǔ) + 8 " I
DRN
5.8礎(chǔ)
20 " V
OS
58礎(chǔ)
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礎(chǔ)
5.8礎(chǔ)
58礎(chǔ)
425212 F09
GATE
START-UP
INITIAL TIMING
Figure 9. System Power-Up Timing (All Waveforms Are Referenced to V
EE
)
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