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UC3843AL-S08-R Arkusz danych(PDF) 6 Page - E-Tech Electronics LTD

Numer części UC3843AL-S08-R
Szczegółowy opis  CURRENT MODE PWM CONTROL CIRCUITS
PDF  9 Pages
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Producent  ETL [E-Tech Electronics LTD]
Strona internetowa  http://e-tech.com.hk
Logo ETL - E-Tech Electronics LTD

UC3843AL-S08-R Arkusz danych(HTML) 6 Page - E-Tech Electronics LTD

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UC3842A/3843A
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 9
www.unisonic.com.tw
QW-R103-002.G
CURRENT SENSE CIRCUIT
5
3
1
2R
R1V
C
Rs
R
Is
Error Amplifier
Current Sense Comparator
Peak current (Is) determined by the formula: ISMAX=1.0V/Rs.
A small RC filter be required to suppress switch transients.
SLOPE COMPENSATION
A fraction of the oscillator ramp can be resistively summed with the current sense signal to provide slope
compensation for converts requiring duty cycles over 50%.Note that capacitor C, forms a filter with R2 to suppress
the leading edge switch spikes.
OSCILLATOR SECTION
Dead time vs. CT(RT>5kΩ)
Timing Resistance vs. Frequency



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