UC3845 datasheet(6/12 Pages) FAIRCHILD

Numer części	UC3845

Szczegółowy opis	SMPS Controller

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Producent	FAIRCHILD [Fairchild Semiconductor]

Strona internetowa	http://www.fairchildsemi.com

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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

Ω f

1.8

R

TCT

---------------

=

,

>

(Deadtime vs CT RT > 5kΩ)

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UC3845 Arkusz danych(PDF) 6 Page - Fairchild Semiconductor

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