UC3842 datasheet(6/12 Pages) FAIRCHILD

Nombre de pieza

Descripción

UC3842

SMPS Controller ( 12 Page)

FAIRCHILD

6 page

UC3842/UC3843/UC3844/UC3845

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

TCTIn

0.0063R

2.7

–

0.0063R

–

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





ForRT

Ω f

1.8

TCT

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

(Deadtime vs CT RT > 5kΩ)

1 2 3 4 5 6 7 8 9 10 11 12

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