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UC3843BL-S08-R Datenblatt(PDF) 6 Page - Unisonic Technologies

Teilenummer UC3843BL-S08-R
Bauteilbeschribung  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Hersteller  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3843BL-S08-R Datenblatt(HTML) 6 Page - Unisonic Technologies

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UC3842B/3843B
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 10
www.unisonic.com.tw
QW-R103-012.E
APPLICATION INFORMATION(Cont.)
Current Sense Circuit
Peak current (IS) is equaled:
IS(MAX)=1.0V/RS
There should be a small RC filter to suppress switch transients.
Oscillator Waveforms and Maximum Duty Cycle
8
5
4
VREF
RT/RC
GND
CT
RT
INTERINAL CLOCK
INTERINAL CLOCK
V4
V4
LARGE RT
SMALL CT
SMALL CT
LARGE RT
CT (Oscillator timing capacitor) can be charged by VREF through RT and discharged by an internal current source.
At discharge time, the internal clock signal blanks the output to the low. Both oscillator frequency and maximum duty
cycle can be determined by Selection of RT and CT. All charge and discharge times can be calculated by the next
formulas:
tC=0.55 RT CT
tD=RTCTIN
⎟⎟
⎜⎜
4
0.0063R
2.7
0.0063R
T
T


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