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參數(shù)資料
| 型號： | LTC4216CDE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Ultralow Voltage Hot Swap Controller |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封裝： | 4 X 3 MM, PLASTIC, DFN-12 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大小： | 277K |
| 代理商： | LTC4216CDE |
LTC4216
17
For example, if I
LOAD(MAX)
= 5A, R
SENSE
= 4.3m
Ω
. The
nearest standard value is 4m
Ω
.
For proper circuit breaker operation, kelvin-sense PCB
connections between the sense resistor and the LTC4216’s
SENSEP and SENSEN pins are strongly recommended.
Figure 12 illustrates the correct way of making connections
between the LTC4216 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.
The power rating of the sense resistor should accom-
modate the fault current level during analog current limit
so that the component is not damaged before the circuit
breaker trips.
Circuit Breaker Trip Current Calculation
For a selected R
SENSE
value, the typical load current that
trips the circuit breaker is given by:
The minimum load current that trips the circuit breaker
is given by:
I
V
R
mV
R
TRIP TYP
(
CB TH TYP
(
SENSE TYP
SENSE TYP
)
,
)
(
)
(
)
=
=
25
(13)
I
V
R
mV
R
TRIP MIN
(
CB THMIN
(
SENSE MAX
SENSE MAX
)
,
)
(
)
(
)
.
=
=
21 5
(14)
Figure 12. Making PCB Connections to the Sense Resistor
TO
SENSEP
W
TO
SENSEN
TRACK WIDTH W:
0.03 PER AMPERE
ON 1OZ COPPER
CURRENT FLOW
TO LOAD
SENSE RESISTOR
CURRENT FLOW
TO LOAD
4216 F12
where
The maximum load current that trips the circuit breaker
is given by:
R
R
R
100
SENSE MAX
SENSE TYP
TOL
(
)
(
)
=
+
1
where
I
V
R
mV
R
TRIP MAX
(
CB THMAX
(
SENSE MIN
SENSE MIN
)
,
)
(
)
(
)
.
=
=
28 5
(15)
For example, if a sense resistor of 4m
Ω
± 1% R
TOL
is used
for current sensing, the typical trip current, I
TRIP(TYP
) =
6.25A. From Equations (14) and (15), I
TRIP(MIN)
= 5.3A
and I
TRIP(MAX)
= 7.2A respectively.
For proper operation and to avoid tripping the circuit breaker
unnecessarily, the minimum trip current, I
TRIP(MIN)
, must
exceed the maximum operating load current of the circuit
connected to the output of the MOSFET.
R
R
R
100
SENSE MIN
SENSE TYP
TOL
(
)
(
)
–
=
1
MOSFET Selection
The external MOSFET switch must have adequate safe
operating area (SOA) to handle short-circuit conditions
before the circuit breaker trips. These considerations
take precedence over continuous drain current ratings. A
MOSFET with adequate SOA for a given application can
always handle the required drain current, but the opposite
may not be true. Consult the manufacturer’s MOSFET
datasheet for safe operating area and effective transient
thermal impedance curves.
MOSFET selection is a 3-step process by assuming the
absence of a soft-start capacitor. First, R
SENSE
is chosen
and then the time required to charge the load capacitance
is determined. This timing, along with the maximum short-
circuit current and maximum load supply voltage, defines
an operating point that is checked against the MOSFET’s
SOA curve.
In addition, consider three other key parameters:
APPLICATIU
W
U
U
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LTC4216CDE#PBF | 功能描述:IC CTLR HOT SWAP 12-DFN 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 |
| LTC4216CDE#TR | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 6V 12-Pin DFN EP T/R |
| LTC4216CDE#TRPBF | 功能描述:IC CNTRLR HOT SWAP 12-DFN 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 |
| LTC4216CMS | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Ultralow Voltage Hot Swap Controller |
| LTC4216CMS#PBF | 功能描述:IC CNTRLR HOT SWAP 10-MSOP 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 |
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