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参数资料
| 型号： | UC3845DX |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | SOP-14 |
| 文件页数： | 17/20页 |
| 文件大小： | 249K |
| 代理商： | UC3845DX |
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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相关代理商/技术参数 |
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|---|---|
| UC3845G-D08-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845G-S08-R | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845G-S08-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845J | 制造商:Texas Instruments 功能描述:Current Mode PWM Controller 1A 8-Pin CDIP Tube |
| UC3845L-D08-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
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