參數(shù)資料
型號(hào)： LTC4216IDE#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 18/26頁(yè)
文件大?。?/td> 311K
描述： IC CNTRLR HOT SWAP 12-DFN
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(kāi)關(guān)： 無(wú)
電源電壓： 2.3 V ~ 6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 12-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 12-DFN（4x3）
包裝： 帶卷 (TR)
LTC4216
18
4216fa
For more information www.linear.com/LTC4216
applicaTions inForMaTion
For example, if I
LOAD(MAX)
 = 5A, R
SENSE
 = 4.3m? The
nearest standard value is 4m?
For proper circuit breaker operation, kelvin-sense PCB
connections between the sense resistor and the LTC4216s
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:
 
I
V
R
mV
R
TRIP TYP
CB THTYP
SENSE TYP
SENSE TYP
(    )
(   ,    )
(    )
=

=
25
 
(13)
The minimum load current that trips the circuit breaker
is given by:
 
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
where
 
R
R
R
SENSE MAX
SENSE TYP
TOL
(    )
(    )
"
=
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
1
100
The maximum load current that trips the circuit breaker
is given by:
 
I
V
R
mV
R
TRIP MAX
CB THMAX
SENSE MIN
SENSE MIN
(    )
(   ,    )
(    )
.
=

=
28 5
where
(15)
 
R
R
R
SENSE MIN
SENSE TYP
TOL
(    )
(    )
"   
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
1
100
For example, if a sense resistor of 4m??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.
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 manufacturers MOSFET
data sheet 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 MOSFETs
SOA curve.
In addition, consider three other key parameters:
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
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