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UC3842 Datasheet(PDF) 6 Page - Fairchild Semiconductor

Part No. UC3842
Description  SMPS Controller
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

UC3842 Datasheet(HTML) 6 Page - 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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