@vic
AV3842A / 3843A LINEAR INTEGRATED CIRCUIT
ERROR AMPLIFIER CONFIGURATION
2.5V
0.5mA
Zi
Zf
2
1
Error amplifier can source or sink up to 0.5mA
CURRENT SENSE CIRCUIT
Error
Amplifier
Is
R
1V
2R
1
R
Rs
C
3
5
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
0.1
µF
CT
8
4
RT
R1
3
R2
C
Isense
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.
QW-R103-002,B
AVICTEK [ Avic Technology ]
