參數(shù)資料
型號(hào)： UCC2977TRPW
廠商： Texas Instruments, Inc.
英文描述： Precision 500 mA regulators
中文描述： 鎮(zhèn)流器/背光控制器/驅(qū)動(dòng)器| TSSOP封裝| 8引腳|塑料
文件頁(yè)數(shù)： 10/28頁(yè)
文件大?。?/td> 433K
代理商： UCC2977TRPW
SLUS499A
–
NOVEMBER 2001
–
REVISED JANUARY 2002
10
www.ti.com
APPLICATION INFORMATION
MECHANICAL
DISPLACEMENT
MECHANICAL
STRESS
0
0
VIN
VOUT
SUPPORTS
L = LENGTH
T = THICKNESS
h = HEIGHT
FORCE
FORCE
PRIMARY
SECONDARY
UDG
–
01076
Figure 7. Typical Longitudinal Mode Piezoelectric Transformer for CCFL Applications.
A typical multi-layer PZT with
longitudinal mode
geometry is shown in Figure 7, a single layer design would have
similar construction without the layering on the primary. An ac voltage is applied to the V
IN
electrodes causing
mechanical expansion and compression in the thickness direction (see Figure 6). This displacement on the
primary is transferred as a force in the longitudinal direction. Supports at and wavelength provide a means
for a standing wave to be generated at a resonant frequency as shown. Mechanical resonance occurs at
multiple standing wave frequencies (n) based on the transformer
’
s length and material velocity (v).
f
n
n
v
length
2
Voltage gain is a function of the PZT material coefficient g[
ω
], the number of primary layers, the thickness of
the material and the overall length as follows:
V
GAIN
length
thickness
layers
g[ ]
An electrode at V
OUT
is used to recover the amplified electrical potential at the secondary.
PZT electrical model
In order to predict PZT performance in a system, it is useful to develop an electrical circuit model. The model
shown in Figure 8 is often used to describe the behavior of a PZT near the fundamental resonant frequency.
Many PZT manufacturers will provide component values for the model based on measurements taken at
various frequencies and output loads.
(1)
(2)
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