UC3844N datasheet(6/12 Pages) FAIRCHILD

Il numero della parte	UC3844N

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)

Codice articolo simile - UC3844N

Produttore elettronici	Il numero della parte	Scheda tecnica	Spiegazioni elettronici
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Fairchild Semiconductor	UC3844N	127Kb / 12P	SMPS Controller
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UC3844N Scheda tecnica(PDF) 6 Page - Fairchild Semiconductor

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