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參數(shù)資料
| 型號(hào)： | UC3845DX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | SOP-14 |
| 文件頁(yè)數(shù)： | 17/20頁(yè) |
| 文件大小： | 249K |
| 代理商： | UC3845DX |
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UC3842/UC3843/UC3844/UC3845
6
Figure 5. Oscillator Waveforms and Maximum Duty Cycle
Oscillator timing capacitor, CT, is charged by VREF through RT and discharged by an internal current source. During the
discharge time, the internal clock signal blanks the output to the low state. Selection of RT and CT therefore determines both
oscillator frequency and maximum duty cycle. Charge and discharge times are determined by the formulas:
tc = 0.55 RT CT
Frequency, then, is: f=(tc + td)
-1
Figure 8. Shutdown Techniques
Figure 6. Oscillator Dead Time & Frequency
Figure 7. Timing Resistance vs Frequency
t
D
R
TCTIn
0.0063R
T
2.7
–
0.0063R
T
4
–
----------------------------------------
=
ForRT
5K
f
1.8
R
TCT
---------------
=
,
>
(Deadtime vs CT RT > 5k)
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