UC3842A(Old_V) Просмотр технического описания (PDF) - Unisonic Technologies
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UC3842A Datasheet PDF : 7 Pages
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UTC UC3842A / 3843A LINEAR INTEGRATED CIRCUIT
ERROR AMPLIFIER CONFIGURATION
2.5V
0.5mA
Zi
2
Zf
1
Error amplifier can source or sink up to 0.5mA
CURRENT SENSE CIRCUIT
Is
R
Rs
1
3
C
5
Error
Amplifier
2R
R
1V
Current Sense
Comparator
Peak current (Is) determined by the formula:
Ismax=10V/Rs.
A small RC filter be required to suppress switch transients.
SLOPE COMPENSATION
8
RT
4
CT
R1
Isense
3
R2
C
Rsense
A fraction of the oscillator ramp can be resistively summed with the current sense signal to provide slope
compensation for converts requiring duty cycles over 50%.Note that capacitor C, forms a filter with R2 to suppress
the leading edge switch spikes.
UTC
UNISONIC TECHNOLOGIES CO. LTD 4
QW-R103-002,A
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