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參數(shù)資料
| 型號： | LTC4221IGN#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 19/28頁 |
| 文件大小： | 272K |
| 描述： | IC CTRLR HOTSWAP DUAL 16SSOP |
| 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)： | 無 |
| 電源電壓： | 1 V ~ 13.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
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19
LTC4221
4221fa
latch is cleared and the FAULT pin sources a 3.8糀 pull-up
current to charge up C
ON1
. The typical delay t
ON
is :
t
V
V
C
A
ON
ON
=
(
)
?/DIV>
0 851 0 4
3 8
1
.
.
"
.
(3)
As shown in the timing diagram of Figure 11, the autoretry
circuitry will attempt to restart the LTC4221 with a duty
cycle:
Duty Cycle =
t
STARTUP
+
(
)
+
+
+
t
t
t
t
t
FILTER
ON INITIAL STARTUP FILTER
"
%
100
(4)
t
FILTER
is defined in Equation 1 and t
ON
is defined in Equa-
tion 3. t
INITIAL
, the initial timing cycle delay, is given in
Equation 9 located in the Initial Timing Cycle section.
t
STARTUP
, the start-up cycle delay, is given in Equation 10
and found in the Start-Up Cycle Without Current Limit
section. Using the capacitor values as shown in Figure 10,
the Autoretry Duty cycle works out to be approximately 6%.
Sense Resistor Consideration
The fault current level at which the LTC4221s internal
electronic circuit breaker trips is determined by sense
resistors connected between each channels V
CC
and
SENSE pins. For both channels, the slow comparator trip
current and the fast comparator trip current are given by
equations (5) and (6) respectively.
I
V
R
mV
R
TRIP SC
SENSE SC
SENSE
SENSE
( )
( )
=
=
25
(5)
I
V
R
mV
R
TRIP FC
SENSE FC
SENSE
SENSE
( )
( )
=
=
100
(6)
The power rating of the sense resistor should be rated at
the fault current level. Table 1 in the Appendix lists some
common sense resistors.
For proper circuit breaker operation, Kelvin-sense PCB
connections between the sense resistor and each channels
V
CC
and SENSE pins are strongly recommended. The
drawing in Figure 12 illustrates the connections between
the LTC4221 and the sense resistor. PCB layout should be
balanced and symmetrical to minimize wiring errors. In
addition, the PCB layout for the sense resistor should
include good thermal management techniques for optimal
sense resistor power dissipation.
Calculating Current Limit
For a selected R
SENSE
, the load current must not exceed
I
TRIP(SC)
. The minimum I
TRIP(SC)
is given by Equation 7:
I
V
R
mV
R
TRIP SCMIN
SENSE SCMIN
SENSE MAX
SENSE MAX
(
)
(
)
(
)
(
)
.
=
=
20 5
(7)
where
R
R
R
SENSE MAX
SENSE
TOL
(
)
"
=
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
1
100
The maximum I
TRIP(SC)
is given by Equation 8:
I
V
R
mV
R
TRIP SCMAX
SENSE SCMAX
SENSE MIN
SENSE MIN
(
)
(
)
( )
( )
.
=
=
29 5
(8)
where
R
R
R
SENSE MIN
SENSE
TOL
( )
"
=
?/DIV>
?/DIV>
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?/DIV>
?/DIV>
?/DIV>
?/DIV>
1
100
If a 7m?sense resistor with ?% tolerance is used for
current limiting, the nominal slow comparator trip current
is 3.57A. From Equations 7 and 8, I
TRIP(SCMIN)
= 2.9A and
I
TRIP(SCMAX)
= 4.26A. For proper operation, the minimum
I
TRIP(SC)
must exceed the circuit maximum operating load
current. For reliability purposes, the operation at the
maximum trip current must be evaluated carefully. If
necessary, two resistors with the same R
TOL
can be
connected in parallel to yield a nominal R
SENSE
value that
fits the circuit requirements.
APPLICATIO S I FOR ATIO
U
U
U
SENSE RESISTOR
TO
V
n
TO
SENSEn
CURRENT FLOW
TO LOAD
CURRENT FLOW
TO LOAD
RACK WIDTH W:
0.03" PER AMP
ON 1oz COPPER
W
4221 F12
Figure 12. PCB Connections to the Sense Resistor
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| LTC4222CG#PBF | 功能描述:IC CTRLR DUAL HOT SWAP 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 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:管件 |
| LTC4222CG#TRPBF | 功能描述:IC CTRLR DUAL HOT SWAP 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
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