參數(shù)資料
型號: LTC4252A-1IMS#TRPBF
廠商: Linear Technology
文件頁數(shù): 29/36頁
文件大?。?/td> 328K
描述: IC CNTRLR HOTSWAP NEGVOLT 10MSOP
標準包裝: 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
29
425212fe
For more information www.linear.com/LTC4252-1
applicaTions inForMaTion
current begins to decline below V
ACL
(t). The current limit
loop shuts off and GATE releases at time point 8. At time
point?, the SENSE voltage falls below V
CB
 and TIMER
deactivates.
Large values of C
SS
 can cause premature circuit breaker
time out as V
ACL
(t) may exceed the V
CB
 potential during
the circuit breaker delay. The load capacitor is unable to
achieve full charge in one GATE start-up cycle. A more
serious side effect of large C
SS
 values is SOA duration
may be exceeded during soft-start into a low impedance
load. A soft-start voltage below V
CB
 will not activate the
circuit breaker TIMER.
Power Limit Circuit Breaker
Figure 19 shows the LTC4252A-1 in a power limit circuit
breaking application. The SENSE pin is modulated by the
board supply voltage, V
SUPPLY
. The D1 Zener voltage, V
Z
 
is set to be the same as the low supply operating voltage,
V
SUPPLY(MIN)
 = 43V . If the goal is to have the high supply
operating voltage, V
SUPPLY(MAX)
 = 71V giving the same
power at V
SUPPLY(MIN)
, then resistors R4 and R6 are
selected using the ratio:
 
R6
R4
=
V
CB
V
SUPPLY(MAX)
 
(16)
If R6 is 27? R4 is 38.3k. The peak circuit breaker power
limit is:
 
POWER
MAX
=
V
SUPPLY(MIN)
+V
SUPPLY(MAX)
(
)
2
4"V
SUPPLY(MIN)
"V
SUPPLY(MAX)
"POWER
SUPPLY(MIN)
=1.064"POWER
SUPPLY(MIN)
 
(17)
when
   V
SUPPLY
 = 0.5 " (V
SUPPLY(MIN)
 + V
SUPPLY(MAX)
) = 57V .
The peak power at the fault current limit occurs at the supply
overvoltage threshold. The fault current limited power is:
 
OWER
FAULT
=
V
SUPPLY
R
S
"  V
ACL
  V
SUPPLY
V
Z
(
)
"
R6
R4
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
 
(18)
TIMER
GATE
SENSE
SS
DRAIN
V
TMRH
V
DRNCL
V
ACL
V
CB
V
DRNL
V
GS(th)
V
IN
  V
GATEH
V
TMRL
425212 F18
PWRGD
5.8礎(chǔ)
58礎(chǔ)
58礎(chǔ)
TIMER
GATE
SENSE
SS
DRAIN
V
TMRH
V
DRNCL
V
CB
V
ACL
V
DRNL
V
GS(th)
V
IN
  V
GATEH
V
TMRL
PWRGD
5.8礎(chǔ)
58礎(chǔ)
58礎(chǔ)
12 34 567    7a
8  9   10  11
END OF INTIAL TIMING CYCLE
12 34  5 6
7
8  9   10  11
END OF INTIAL TIMING CYCLE
20 " V
OS
20 " (V
CB
 + V
OS
)
20 " (V
ACL
 + V
OS
)
20 " V
OS
20 " (V
CB
 + V
OS
)
20 " (V
ACL
 + V
OS
)
230礎(chǔ) + 8 " I
DRN
230礎(chǔ) + 8 " I
DRN
Figure 18. Soft-Start Timing (All Waveforms Are Referenced to V
EE
)
(18a) Without External C
SS
(18b) With External C
SS
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