參數(shù)資料
型號(hào)： A1120LUA-T
廠商： Allegro Microsystems Inc
文件頁(yè)數(shù)： 14/18頁(yè)
文件大?。?/td> 407K
描述： IC SW HALL EFFECT CHOPPER 3-SIP
產(chǎn)品培訓(xùn)模塊： Current Sensor
標(biāo)準(zhǔn)包裝： 4,000
傳感范圍： 50G 跳閘，5G 釋放
類型： 單極開關(guān)
電源電壓： 3 V ~ 24 V
電流 - 電源： 4mA
電流 - 輸出（最大）： 25mA
輸出類型： 數(shù)字式，開漏極
特點(diǎn)： 高溫
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
產(chǎn)品目錄頁(yè)面： 1139 (CN2011-ZH PDF)
其它名稱： 620-1330
Chopper Stabilized Precision Hall Effect Switches
A1120, A1121, A1122,
A1123, and A1125
14
Allegro MicroSystems, LLC
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 supplied
power or improving the heat dissipation properties of the appli-
cation. This section presents a procedure for correlating factors
affecting operating T
J
. (Thermal data is also available on the
Allegro MicroSystems website.)
The Package Thermal Resistance, R
qJA
, is a figure 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 significant 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
= 1.6 mA, and R
qJA
 = 165 癈/W, then:
    P
D
= V
CC
 
?/DIV>
 I
CC
= 12 V
?/DIV>
 1.6 mA = 19 mW
   DT = P
D
 
?/DIV>
 R
qJA
 = 19 mW
?/DIV>
 165 癈/W = 3癈
    T
J
 = T
A
 + DT = 25癈 + 3癈 = 28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 LH, using a
minimum-K PCB.
Observe the worst-case ratings for the device, specifically:
R
qJA
=
 
228癈/W, T
J
(max)
 
=
 
165癈, V
CC
(max)
 
=
 
24 V, and
I
CC
(max)
 
=
 
4
 
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 ?228 癈/W = 66 mW
Finally, invert equation 1 with respect to voltage:
  V
CC(est)
 = P
D
(max)
 
? I
CC
(max) = 66 mW ?4 mA = 16.5 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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