參數(shù)資料
型號(hào)： UCC2975TRPW
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)： 17/28頁(yè)
文件大小： 433K
代理商： UCC2975TRPW
SLUS499A
–
NOVEMBER 2001
–
REVISED JANUARY 2002
17
www.ti.com
APPLICATION INFORMATION
half-bridge operation and inductor selection
In the half-bridge topology, the external inductor and piezoelectric capacitance form a low-pass filter between
the common switch node of the external MOSFETs and the piezoelectric primary as shown on the front page.
The L-C filter formed by these components should pass the resonant frequency, required by the piezoelectric
transformer, yet attenuate higher harmonic components. The choice of inductor will require bench
measurements and modeling of the resonant circuit:
An inductor value that is too low (high L-C resonant frequency) will result in non-sinusoidal primary
waveforms since higher order harmonics are allowed though the filter. A low value also allows excess
circulating currents, impacting efficiency.
An inductor value that results in a L-C resonant frequency close to the resonant frequency of the
piezoelectric transformer causes interference, making control of the primary voltage difficult. The
interference occurs since the gain of the L-C tank depends heavily on load in this region of operation.
An inductor value that is too large causes an attenuation of the input voltage, increasing the gain
requirements of the piezoelectric transformer and/or the system.
As an example, suppose a piezoelectric transformer is selected that operates efficiently at 67 kHz (similar to
Figure 9) and has 0.2-
μ
F of primary capacitance. An external inductance value of 15
μ
H gives a L-C filter corner
frequency of 92 kHz. The L-C circuit would provide little attenuation at 67 kHz yet attenuate higher harmonics.
Figure 13
f
–
Frequency
–
kHz
V
–
–
UCC3976 L-C TANK FREQUENCY
vs
LAMP LOADS
0
50
150
200
250
300
100
0
1
1.5
2.0
0.5
fPZT = 67 kHz
LAMP LOAD
150 k
100 k
50 k
相關(guān)PDF資料
PDF描述
UCC2977 Multi-Topology Piezoelectric Transformer Controller
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UCC2977TRPW Precision 500 mA regulators
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UCC2976PW 功能描述:LCD 驅(qū)動(dòng)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(shí)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
UCC2976PWG4 功能描述:LCD 驅(qū)動(dòng)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(shí)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
UCC2976PWR 制造商:Rochester Electronics LLC 功能描述:- Bulk
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(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
UCC2977PW 功能描述:LCD 驅(qū)動(dòng)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(shí)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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