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High Accuracy Analog Speed Sensor IC with Integrated
Filter Capacitor and Dual Zero-Crossing Output Signal
A1425
12
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 combina-
tions of peak conditions, reliable operation may require derating
supplied 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
= 5.0 V, I
CC
= 4.2 mA, and R
qJA
 = 177 癈/W, then:
    P
D
= V
CC
 
?/DIV>
 I
CC
= 5.0 V
?/DIV>
 4.2 mA = 21.0 mW
   DT = P
D
 
?/DIV>
 R
qJA
 = 21.0 mW
?/DIV>
 177 癈/W = 3.7癈
    T
J
 = T
A
 + DT = 25癈 + 3.7癈 = 28.7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, using minimum-K PCB
Observe the worst-case ratings for the device, speci cally:
R
qJA
=
 
177癈/W, T
J
(max)
 
=
 
165癈, V
CC
(max)
 
=
 
26.5
 
V, and
I
CC
(max)
 
=
 
7.0
 
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 ?177 癈/W = 84 mW
Finally, invert equation 1 with respect to voltage:
  V
CC(est)
 = P
D
(max)
 
? I
CC
(max) = 84 mW ?7.0 mA = 12 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.
For example, when a standard diode with a 0.7 V drop is used:
V
S
(max) = 12 V + 0.7 V = 12.7 V
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