參數(shù)資料
型號: LTC1644CGN#TRPBF
廠商: Linear Technology
文件頁數(shù): 13/24頁
文件大?。?/td> 447K
描述: IC CONTROLLER HOT SWAP 20-SSOP
標(biāo)準(zhǔn)包裝: 2,500
類型: 熱交換控制器
應(yīng)用: CompactPCI?
內(nèi)部開關(guān):
電源電壓: 3.3V,5V,±12V
工作溫度: 0°C ~ 70°C
安裝類型: 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)
LTC1644
13
1644f
APPLICATIO  S I FOR  ATIO
U
U
U
Figure 3. Normal Power-Down Sequence
Figure 2. Normal Power-Up Sequence
TIMER
During a power-up sequence, a 21礎(chǔ) current source is
connected to the TIMER pin (Pin 4) and current limit faults
are ignored until the voltage ramps to within 1V of 12V
IN
(Pin 1). This feature allows the chip to power up CPCI
boards with widely varying capacitive loads on the sup-
plies. The power-up time for any one of the four outputs is
given by Equation 2:
t   XV
C
XV
I
I
ON    OUT
LOAD XVOUT
OUT
LIMIT XVOUT    LOAD XVOUT
(
)
=   "
"

?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
2
(
)
(
)
(
)
(2)
where XV
OUT
 = 5V
OUT
, 3V
OUT
, 12V
OUT
 or V
EEOUT
 (12V).
For example, for C
LOAD(5VOUT)
 = 2000礔, I
LIMIT(5VOUT)
 =
7A and I
LOAD(5VOUT)
 = 5A, the 5V
OUT
 turn-on time will be
~10ms. By substituting the variables in Equation 2 with the
appropriate values, the turn-on time for the other three
outputs can be calculated.
The timer period should be set longer than the maximum
supply turn-on time but short enough to not exceed the
maximum safe operating area of the pass transistor during
a short circuit. The timer period for the LTC1644 is given
by:
t
C
V
A
TIMER
TIMER
=
"
?/DIV>
11
21
(3)
As a design aid, the timer period as a function of the timing
capacitor using standard values from 0.01礔 to 1礔 is
shown in Table 2.
TIMER
10V/DIV
GATE
5V/DIV
12V
OUT
10V/DIV
V
EEOUT
10V/DIV
5V
OUT
10V/DIV
3V
OUT
10V/DIV
LOCAL_PCI_RST#
5V/DIV
BD_SEL#
5V/DIV
HEALTHY#
5V/DIV
PRECHARGE
5V/DIV
10ms/DIV
1644 F02
TIMER
10V/DIV
GATE
5V/DIV
12V
OUT
10V/DIV
V
EEOUT
10V/DIV
5V
OUT
10V/DIV
3V
OUT
10V/DIV
LOCAL_PCI_RST#
5V/DIV
BD_SEL#
5V/DIV
HEALTHY#
5V/DIV
PRECHARGE
5V/DIV
10ms/DIV
1644 F03
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