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參數(shù)資料
| 型號(hào)： | UCC3976TRPW |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Low consumption voltage and current controller for battery chargers and adaptors |
| 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)： | 19/28頁(yè) |
| 文件大?。?/td> | 433K |
| 代理商： | UCC3976TRPW |
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SLUS499A
–
NOVEMBER 2001
–
REVISED JANUARY 2002
19
www.ti.com
APPLICATION INFORMATION
push-pull operation and inductor selection
For the push-pull circuit, MOSFETs N1 and N2 are driven out of phase with 50% duty cycle at variable frequency
(see Figure 15: trace 2). Inductors L1 and L2 resonate with the PZT primary capacitance, forming a half
sinusoids at the drain of N1 (trace 1) and S2 (trace 4). The resulting voltage across the PZT primary is a near
sinusoid (trace M1). Due to the high Q of the ceramic transformer, the lamp voltage, which is approximately
600 V in this application, is sinusoidal (trace 3). In order to achieve zero-voltage switching, each drain voltage
must return to zero before the next switching cycle. This dictates that the L-C resonant frequency be greater
than the switching frequency. The maximum inductance to meet these conditions can be found from
equation (16):
L
1
4
2
f
2
C
p
VIN = 7 Vdc
VLAMP = 600 V
Figure 15. UCC3977 Push-Pull Waveforms
(16)
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