參數(shù)資料
型號: LTC4214-1IMS#TRPBF
廠商: Linear Technology
文件頁數(shù): 21/32頁
文件大?。?/td> 277K
描述: IC CTRLR 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):
電源電壓: 6 V ~ 16 V
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)
LTC4214-1/LTC4214-2
21
421412f
APPLICATIO  S I FOR  ATIO
U
U
U
Figure 9. Power-Up Timing with a Short Pin (All Waveforms are Referenced to V
EE
)
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礎(chǔ) current source pull-
up. At time point 3, TIMER reaches the V
TMRH
 threshold
and the initial timing cycle terminates. The TIMER capaci-
tor 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 satisfied before
a GATE start-up cycle begins. SS ramps up as dictated by
R
SS
" C
SS
; GATE is held low by the analog current limit
amplifier until SS crosses 20 " V
OS
. Upon releasing GATE,
50礎(chǔ) sources into the external MOSFET gate and com-
pensation network. When the GATE voltage reaches the
MOSFETs threshold, current begins flowing into the load
capacitor at time point 5. At time point 6, load current
reaches the SS control level and the analog current limit
loop activates. Between time points 6 and 8, the GATE
voltage is servoed, the SENSE voltage is regulated at
V
ACL
(t) 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
5礎(chǔ)
50礎(chǔ)
5礎(chǔ)
5礎(chǔ)
50礎(chǔ)
GATE
START-UP
INITIAL TIMING
UV CLEARS V
UVHI
, CHECK OV < V
OVHI
, GATE < V
GATEL
, SENSE < V
CB
, SS < 20 " V
OS
 AND TIMER < V
TMRL
1
2
3 4 56    7   89
TIMER CLEARS V
TMRL
, CHECK GATE < V
GATEL
, SENSE < V
CB
 AND SS < 20 " V
OS
1011
4214 F09
GND  (12V)
UV/OV
V
IN
TIMER
GATE
SENSE
V
OUT
SS
DRAIN
PWRGD
V
LKO
V
UVHI
V
ACL
V
CB
40礎(chǔ) + 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
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