參數(shù)資料
型號： A1180LUA-T
廠商： Allegro Microsystems Inc
文件頁數(shù)： 11/16頁
文件大?。?/td> 543K
描述： IC SWITCH HALL EFFECT UNI 3-SIP
產(chǎn)品培訓(xùn)模塊： Current Sensor
標(biāo)準(zhǔn)包裝： 500
傳感范圍： 60G ~ 200G 跳閘 - 可編程，固定釋放
類型： 單極開關(guān)
電源電壓： 3.5 V ~ 24 V
電流 - 電源： 5mA
輸出類型： 數(shù)字，開路集電極
特點： 可編程
工作溫度： -40°C ~ 150°C
封裝/外殼： 3-SIP
供應(yīng)商設(shè)備封裝： 3-SIP
包裝： 散裝
Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
A1180, A1181,
A1182, and A1183
10
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Power Derating
The device must be operated below the maximum junction
temperature of the device, T
J(max)
. Under certain combinations of
peak conditions, reliable operation may require derating sup-
plied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating T
J
. (Thermal data is also available on
the Allegro MicroSystems Web site.)
The Package Thermal Resistance, R
qJA
, is a  gure of merit sum-
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, R
qJC
, is
relatively small component of R
qJA
. Ambient air temperature,
T
A
, and air motion are signi cant external factors, damped by
overmolding.
The effect of varying power levels (Power Dissipation, P
D
), can
be estimated. The following formulas represent the fundamental
relationships used to estimate T
J
, at P
D
.
  P
D
= V
IN
 
?/DIV>
 I
IN
(1)
    DT = P
D
 
?/DIV>
 R
qJA
  (2)
    T
J
 = T
A
 + 擳     (3)
For example, given common conditions such as: T
A
= 25癈,
V
CC
= 12 V, I
CC
= 4 mA, and R
qJA
 = 140 癈/W, then:
    P
D
= V
CC
 
?/DIV>
 I
CC
= 12 V
?/DIV>
 4 mA = 48 mW
   DT = P
D
 
?/DIV>
 R
qJA
 = 48 mW
?/DIV>
 140 癈/W = 7癈
    T
J
 = T
A
 + DT = 25癈 + 7癈 = 32癈
A worst-case estimate, P
D(max)
, represents the maximum allow-
able power level (V
CC(max)
, I
CC(max)
), without exceeding T
J(max)
,
at a selected R
qJA
 and T
A
.
Example: Reliability for V
CC
 at T
A
=
 
150癈, package UA, using
minimum-K PCB.
Observe the worst-case ratings for the device, speci cally:
R
qJA
=
 
165癈/W, T
J(max)
=
 
165癈, V
CC(max)
=
 
24 V, and
I
CC(max)
=
 
17
 
mA.
Calculate the maximum allowable power level, P
D(max)
. First,
invert equation 3:
  DT
max
 = T
J(max)
  T
A
 = 165
 
癈
 

 
150
 
癈 = 15
 
癈
This provides the allowable increase to T
J
 resulting from internal
power dissipation. Then, invert equation 2:
  P
D(max)
= DT
max
 ?R
qJA
= 15癈 ?165 癈/W = 91 mW
Finally, invert equation 1 with respect to voltage:
  V
CC(est)
 = P
D(max)
? I
CC(max)
 = 91 mW ?17 mA = 5 V
The result indicates that, at T
A
, the application and device can
dissipate adequate amounts of heat at voltages dV
CC(est)
.
Compare V
CC(est)
 to V
CC(max)
. If V
CC(est)
 d V
CC(max)
, then reli-
able operation between V
CC(est)
 and V
CC(max)
 requires enhanced
R
qJA
. If V
CC(est)
 e V
CC(max)
, then operation between V
CC(est)
 and
V
CC(max)
 is reliable under these conditions.
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