參數(shù)資料
型號： UCC2977
廠商： Texas Instruments, Inc.
英文描述： Multi-Topology Piezoelectric Transformer Controller
中文描述： 多拓?fù)鋲弘娮儔浩骺刂破?/td>
文件頁數(shù)： 20/28頁
文件大?。?/td> 433K
代理商： UCC2977
SLUS499A
–
NOVEMBER 2001
–
REVISED JANUARY 2002
20
www.ti.com
APPLICATION INFORMATION
flyback operation
For single layer PZT applications requiring additional gain, a resonant flyback topology can be implemented as
shown in Figure 16. In the resonant flyback application, a single N-channel switch is driven at 50% duty cycle
producing a half sinusoid at the drain (see Figure 16: trace 1). The magnetic transformer provides a stepped
up voltage to the PZT primary (trace 4). The resulting lamp voltage at the PZT secondary, which is approximately
250 V in this case, is sinusoidal resulting from the high Q of the ceramic transformer (trace 3). When compared
to a high-voltage magnetic CCFL transformer, the magnetic step-up transformer is small and low profile
because of the reduced turns ratio (3.5:1) and voltage rating. To ensure zero-voltage switching, as in the case
of the push-pull converter, equation (16) must be validated. The L-C relationship can be analyzed on either the
primary or secondary side of the magnetic transformer. If viewed from the primary, PZT capacitance is reflected
by the turns ratio.
VIN = 4 Vdc
VLAMP = 250 V
Figure 16. UCC3975 Resonant Flyback Waveforms
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參數(shù)描述
UCC2977EVM 功能描述:電源管理IC開發(fā)工具 UCC2977 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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UCC2977PWG4 功能描述:LCD 驅(qū)動器 Multi-Topology Piezoelectric RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
UCC2977PWR 功能描述:LCD 驅(qū)動器 Multi-Topology Piezoelectric RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
UCC2977PWRG4 功能描述:LCD 驅(qū)動器 Multi-Topology Piezoelectric RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
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