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| AIC3843 Datasheet, PDF (8/11 Pages) Analog Intergrations Corporation – Current-Mode PWM Controller | |||
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AIC3843
Slope compensation
8
VREF
4
RT/ CT
3
ISENSE
AIC3843
0.1µF
RT
CT
C
R1
R2
n BLOCK DIAGRAM
ISENSE
A fraction of the oscillator ramp can be
resistively summed with the current sense
signal to proved slope compensation for
converters requiring duty cycles over 50%
Note that capacitor, C forms a filter with R2 to
suppress the leading edge switch spikes.
RSENSE
Fig. 8
VCC 7
ZD
5 34V
GND
UVLO
S/R
5V
REF
Internal Bias
4
RT/CT
2
VFB
1
COMP
3
ISENSE
2.50V
OSC
Error Amp.
+
-
D1
D2 2R
VREF
Good
Logic
R
Z1
1V
T
S
R
Current
Sense
comparator
PWM
Latch
8
Q1
6
Q2
VREF
5V/50mA
OUTPUT
8
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