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KA3842BD 데이터시트(PDF) 6 Page - Fairchild Semiconductor

부품명 KA3842BD
상세설명  SMPS Controller
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KA3842BD 데이터시트(HTML) 6 Page - Fairchild Semiconductor

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KA3842B/KA3843B/KA3844B/KA3845B
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 dis-
charge 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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