參數(shù)資料
型號(hào): LTC4244CGN-1#TRPBF
廠(chǎng)商: Linear Technology
文件頁(yè)數(shù): 16/28頁(yè)
文件大?。?/td> 337K
描述: IC CTRLR HOTSWAP PCI 20-SSOP
標(biāo)準(zhǔn)包裝: 2,500
類(lèi)型: 熱交換控制器
應(yīng)用: CompactPCI?
內(nèi)部開(kāi)關(guān): 無(wú)
電源電壓: 3.3V,5V,±12V
工作溫度: 0°C ~ 70°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 20-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 20-SSOP
包裝: 帶卷 (TR)
16
LTC4244/LTC4244-1
42441f
immediately to its I
LIMIT
 value. If that supply remains in
current limit for more than 25祍, all of the supplies will be
latched off. The 25祍 prevents quick current spikesfor
example, from a fan turning onfrom causing false trips
of the circuit breaker.
After power-up, the 5V and 3.3V supplies are protected
from short circuits by dual-level circuit breakers. In the
event that either supplys current exceeds the nominal
current limit, an internal timer is started. If the supply is
still overcurrent after 25祍, the circuit breaker trips and all
the supplies are turned off (Figure 5). An analog current
limit loop prevents the supply current from exceeding 3?/DIV>
the nominal current limit in the event of a short circuit
(Figure 6). The LTC4244 will stay in the latched off state
until the OFF/ON pin is cycled high then low or the 12V
IN
power supply is cycled low then high.
The current limit and the foldback current level for the 5V
and 3.3V outputs are both a function of the external sense
resistor. As shown in Figure 1, a sense resistor is con-
nected between 5V
IN
 and 5V
SENSE
 for the 5V supply. For
the 3.3V supply, a sense resistor is connected between
3.3V
IN
 and 3.3V
SENSE
. The typical current limit and the
foldback current levels are given by Equations 6 and 7:
I
mV
R
LIMIT  VOUT
SENSE  VOUT
(
)
(
)
n
n
=
51
(6)
I
mV
R
FOLDBACK  VOUT
SENSE  VOUT
(
)
(
)
n
n
=
16
(7)
where nV
OUT
 = 5V
OUT
 or 3.3V
OUT
.
The current limit for the internal 12V switch is set at
850mA folding back to 360mA and the 12V switch at
610mA folding back to 225mA.
APPLICATIO S I FOR ATIO
U
U
U
GATE
20V/DIV
5V
OUT
10V/DIV
FAULT
5V/DIV
TIMER
20V/DIV
5V
IN
  5V
SENSE
100mV/DIV
10祍/DIV
4244 F05
Figure 5. Overcurrent Fault on 5V Output
GATE
20V/DIV
3.3V
OUT
5V/DIV
FAULT
5V/DIV
TIMER
20V/DIV
3V
IN
  3V
SENSE
500mV/DIV
10祍/DIV
4244 F06
Figure 6. Short-Circuit Fault on 3.3V Output
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