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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)： | 18/28頁(yè) |
| 文件大?。?/td> | 433K |
| 代理商： | UCC2977TRPW |
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SLUS499A
–
NOVEMBER 2001
–
REVISED JANUARY 2002
18
www.ti.com
APPLICATION INFORMATION
half-bridge operation and inductor selection (continued)
Waveforms for the UCC3976 half-bridge circuit operated with a 12-Vdc input are shown in Figure 14. P- and
N-Channel MOSFETs are driven out of phase with 50% duty cycle producing a square wave at the drains (see
Figure15: trace 1). Inductor LRES and the PZT primary capacitance form a low-pass filter. The resulting in a
near sinusoid across the PZT primary (trace 2). Due to the high Q of the PZT, lamp voltage (trace 4) is sinusoidal.
Lamp current is sensed by the half-wave rectification circuit at RCS (trace 3). Lamp current is in phase with lamp
current since the load is primarily resistive with some capacitance due to the reflector
’
s proximity to the lamp.
The lamp reflector should be grounded for safety reasons and in order to keep the secondary capacitance
constant allowing the PZT load to be constant.
VIN = 12 Vdc
VLAMP = 600 V
Figure 14. UCC3976 Half-Bridge Waveforms
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