參數(shù)資料
型號(hào): KA3844B
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 穩(wěn)壓器
英文描述: SMPS Controller
中文描述: 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8
封裝: DIP-8
文件頁(yè)數(shù): 6/12頁(yè)
文件大?。?/td> 91K
代理商: KA3844B
KA3842B/KA3843B/KA3844B/KA3845B
6
Figure 5. Oscillator Waveforms and Maximum Duty Cycle
Oscillator timing capacitor, C
T
, is charged by V
REF
through R
T
, 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 R
T
and C
T
therefore determines both
oscillator frequency and maximum duty cycle. Charge and discharge times are determined by the formulas:
t
c
= 0.55 R
T
C
T
Frequency, then, is: f=(t
c
+ t
d
)
-1
Figure 8. Shutdown Techniques
Figure 6. Oscillator Dead Time & Frequency
(Deadtime vs C
T
RT > 5k
)
Figure 7. Timing Resistance vs Frequency
t
D
R
T
C
T
I
n
0.0063R
0.0063R
T
4
--------------------------–
=
ForRT
5K
f
T
T
--------------
=
,
>
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