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參數(shù)資料
| 型號： | 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)動器| TSSOP封裝| 8引腳|塑料 |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 433K |
| 代理商： | UCC2977TRPW |
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SLUS499A
–
NOVEMBER 2001
–
REVISED JANUARY 2002
9
www.ti.com
APPLICATION INFORMATION
PZT operation
Ceramic piezoelectric transformers were first proposed by C.A. Rosen in 1956. Unlike magnetic transformers
that rely on electromagnetic energy transfer, PZTs transfer electric potential to mechanical force as shown in
Figure 6. The electrical-to-mechanical conversion of energy is referred to as the
reverse piezoelectric effect
whereas the mechanical-to-electrical energy conversion is referred to as the
direct piezoelectric effect
.
+
ELECTRIC
POTENTIAL
ELECTRIC
POTENTIAL
MECHANICAL
FORCE
MECHANICAL
FORCE
+
UDG
–
01099
Figure 6. Piezoelectric Effect
Each manufacturer has a unique
recipe
of materials and structural layering that determine their PZT
’
s operating
characteristics. Common materials used to make PZTs include lead zirconate, lead titanate and lithium niobate.
Single layer PZTs are less costly and easier to manufacture, but have a lower voltage gain (typically 5 to 10 )
and may require a step-up magnetic transformer in order to operate the lamp. Multi-layered PZT designs are
more difficult to manufacture, but have a higher voltage gain (20 to 70) allowing a CCFL to be driven using
conventional off-the-shelf inductors.
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