UC3844D1 datasheet(6/12 Pages) FAIRCHILD

Il numero della parte	UC3844D1

Spiegazioni elettronici	SMPS Controller

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Produttore elettronici	FAIRCHILD [Fairchild Semiconductor]

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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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