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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)： | 18/20頁(yè) |
| 文件大小： | 249K |
| 代理商： | UC3845DX |
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UC3842/UC3843/UC3844/UC3845
7
Shutdown of the UC3842 can be accomplished by two methods; either raise pin 3 above 1V or pull pin 1 below a voltage two
diode drops above ground. Either method causes the output of the PWM comparator to be high (refer to block diagram). The
PWM latch is reset dominant so that the output will remain low until the next clock cycle after the shutdown condition at pins
1 and/or 3 is removed. In one example, an externally latched shutdown may be accomplished by adding an SCR which will be
reset by cycling VCC below the lower UVLO threshold. At this point the reference turns off, allowing the SCR to reset.
Figure 9. Slope Compensation
A fraction of the oscillator ramp can be resistively summed with the current sense signal to provide slope compensation for
converters requiring duty cycles over 50%. Note that capacitor, CT, forms a filter with R2 to suppress the leading edge switch
spikes.
Temperature (
°C)
Figure 10. Temperature Drift (Vref)
Temperature (
°C)
Figure 11. Temperature Drift (Ist)
Temperature (
°C)
Figure 12. Temperature Drift (Icc)
UC3842/UC3843
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UC3842DX | |
| UC3844ADW | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| UC3902DTRG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| UC5306X | T-1 3/4 SINGLE COLOR LED, BLUE GREEN, 5 mm |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3845G-D08-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845G-S08-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
| UC3845G-S08-T | 制造商:UTC-IC 制造商全稱: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 制造商全稱:UTC-IC 功能描述:HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS |
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