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| 型號： | PIEZO_SYSTEMS_PRODUCT_CATALOG |
| 英文描述： | 600mA, 500kHz Step-Down Switching Regulator in SOT-23; Package: SOT; No of Pins: 6; Temperature Range: -40°C to +125°C |
| 文件頁數(shù)： | 49/52頁 |
| 文件大?。?/td> | 643K |
| 代理商： | PIEZO_SYSTEMS_PRODUCT_CATALOG |
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PIEZOCERAMIC
APPLICATIONDATA
P
IEZ O
S
Y ST EMS
, I
NC
.
186 Mssachusetts Avenue Cambridge, MA02139 Te: (617) 547-1777 Fax: (617) 354-2200 Web wwwpezocom E-mail: sales@pezocom
A measure of the dielectric losses in
the material-defined as the tangent of
the loss angle or the ratio of parallel
resistance to the parallel reactance,
expressed in percent.
DISSIPATION FACTOR
The ratio of the mass to volume in
the material,expressed in kg/m
3
DENSITY
The ratio of reactance to resistance
in the equivalent series circuit repre-
senting the mechanical vibrating res-
onant system. The shape of the part
affects the value.
MECHANICAL (QM)
The temperature at which the crystal
structure changes from a non-sym-
metrical (piezoelectric) to a symmet-
rical
(non-piezoelectric)
expressed in degrees Celsius.
form,
CURIE TEMPERATURE
Aging is the attempt of the ceramic to
change back to its original state prior
to polarization. Aging of piezoelectric
ceramics is a logarithmic function with
time. The aging rate defines change in
the material parameters per decade of
time,i.e.,1-10 days,5-50 days,etc.
AGING RATE
Deflection and Force: Piezoelectric
actuators are usually specified in
terms of their free deflection and
blocked force. Free deflection, X(f),
refers to displacement at a given volt-
age level without the actuator work-
ing against any external load. Blocked
force,F(b),refers to the force exerted
at a given voltage level when the actu-
ator is not allowed to move.Since the
force at maximum deflection is zero,
all other values of simultaneous dis-
placement and force (for a given volt-
age level) are determined by a line
drawn between these points on a
force versus deflection diagram as
shown below. In practice, a bending
motor must move a specified amount
and exert a specified force, which
determines its operating point on the
force versus deflection diagram.Work
is maximized when the deflection per-
formed permits one half the blocked
force to be developed. This occurs
when the deflection equals one half
the free deflection.
For cantilevered bending motors,X(f)
and F(b) are approximated by observ-
ing the tip deflection after energizing,
and by holding a force gauge against
the tip during energization.
PERFORMANCE
As with all solids,piezoelectric ceram-
ics have mechanical stiffness proper-
ties described as Young’s Modulus.
Young’s Modulus is the ratio of stress
(force per unit area) to strain (change
in length per unit length).
Because mechanical stressing of the
ceramic produces an electrical
response which opposes the resultant
strain, the effective Young’s Modulus
with electrodes short circuited is
lower than with the electrodes open
circuited. In addition, the stiffness is
different in the 3 direction from that
in the 1 or 2 direction. Therefore, in
expressing such quantities both direc-
tion and electrical conditions must be
specified.Y
E
33is the ratio of stress to
strain in the 3 direction at constant
field E (electrodes shorted).
the equivalent with the electrodes
open circuited.Y
E11
and Y
D11
are the
moduli in the 1 or 2 direction.Y
E55
and YD55 are the ratios of shear
Y
D33
is
YOUNG’S MODULUS
Y =
stress
strain
r
= mass
volume
stress to shear strain.Units are usu-
ally newtons/square meter.
It should be clearly understood that
the piezoceramic properties
described above are defined for ideal
shapes
measured
mechanical and electrical boundary
conditions. When put to use under
practical device operating condi-
tions, the predicted performance is
approached but seldom realized.
Non-ideal shapes and non-ideal
boundary conditions contribute to
transduction losses due to such
things as standing waves, interfering
vibrational modes, pseudo-clamping,
stray electric and dielectric resis-
tances.
Since the possibilities are
infinite, the designer must evaluate
each component under the use con-
ditions for which it is intended.
under
ideal
V2>V1
V1
F
DEFLECTION
Direction of
increasing voltage
Operating point
optimized to produce
maximum work
Xf
Fb
Subscripts denote the relative direc-
tions of electrical and mechanical
quantities and the kind of motion
involved. They can be associated with
vibratory modes of certain simple
transducer shapes; k
33
is appropriate
for a long thin bar,electroded on the
ends, and polarized along the length,
and vibrating in a simple length
expansion and contraction.
relates to a long thin bar, electroded
on a pair of long faces, polarized in
thickness, and vibrating in simple
length expansion and contraction. k
p
signifies the coupling of electrical and
mechanical energy in a thin round
disc,polarized in thickness and vibrat-
ing in radial expansion and contrac-
tion. k
15
describes the energy con-
version in a thickness shear vibration.
Since these coefficients are energy
ratios,they are dimensionless.
k
31
49
CATALOG #3, 1998
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