1) Maximum allowable Power Dissipation, P
D
, is
shown plotted against Ambient Temperature,T
A
,
in the accompanying Power Derating Curve,
indicating the Safe Operating Area for the device.
2) Power consumed by the device, PT, can be
calculated from the equation:
P
T
= P
Q
+ P
PhHi
+ P
PhLo
+ P
TR
+ P
HB
+ P
FGRD
where P
Q i
s power dissipated under quiescent
current conditions, given by:
P
Q
= V
CC
x I
CC
where Vcc is the maximum application
device Supply Voltage
and Icc is the maximum Supply Current
given in the Electrical Characteristics
and P
PhHi
is power generated due to either one
of the phase outputs Ph1Hi or Ph2Hi being
active, given by:
P
PhHi
= I
OL
x V
OL
where I
OL
is the maximum application
Ph1Hi and Ph2Hi output currents
and V
OL
is the maximum Low Level Output
Voltage for the Ph1Hi and Ph2Hi outputs
given in the Electrical Characteristics
and P
PhLo
is power generated due to either one
of the phase outputs Ph1Lo or Ph2Lo being
active, given by:
P
PhLo
= I
OH
x (V
CC
- V
OH
)
where IOH is the maximum application
Ph1Lo and Ph2Lo output currents
and V
CC
is the maximum application device
Supply Voltage
and V
OH
is the minimum High Level Output
Voltage for the Ph1Lo and Ph2Lo outputs
given in the Electrical Characteristics.
and P
TR
is power generated due to the Network
Reference source current, given by:
P
TR
= I
OThRef
x (V
CC
- V
ThRef
)
where I
OThRef
is the maximum application
ThRef output current
and V
CC
is the maximum application device
Supply Voltage
and V
ThRef
is the Network Reference
voltage
and P
HB
is power generated due to the Hall Bias
source current, given by:
P
HB
= I
HB
x (V
CC
- V
HB
)
where I
HB
is the maximum application Hall
Bias output current
and V
HB
is the Hall Bias voltage
and P
FGRD
is power generated due to either or
both the Frequency Generator and Locked
Rotor Detect outputs being active, given by:
P
FGRD
= I
OL
x V
OL
where I
OL
is the maximum application FG
or RD output current
and V
OL
is the FG or RD Low Level Output
Voltage
ZXBM1015
ISSUE 3 - MAY 2007
2
Parameter Symbol Limits Unit
Supply Voltage V
CCmax
-0.6 to 20 V
Input Current I
CCmax
200 mA
Maximum Input Voltage V
Imax
-0.6 to Vcc+0.5 V
Maximum Output Voltage V
Omax
-0.6 to Vcc+0.5 V
Power Dissipation P
Dmax
800 mW
Operating Temp. T
OPR
-40 to 110 °C
Storage Temp. T
STG
-55 to 150 °C
Absolute Maximum Ratings
