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NCL30001
VDD
x4
+
+
I ACEA(out)
To PWM
comparator
V AC_REF
2.8V
?
21.33k W
I AVG
+
?
g m = 100 m S
gm
AC error
amplifier
+
?
37.33k W
R IAVG
AC COMP
R AC_COMP
Figure 53. AC EA Buffer Amplifier
I ACEA(out) + @ 4
2.8 * V ACEA
(eq. 1)
37.33k
The voltage at the PWM non-inverting input is
determined by I ACEA(out) , the instantaneous switch current
along and the ramp compensation current. DRV is
terminated once the voltage at the PWM non-inverting input
reaches 4 V.
Current Sense Amplifier
amplifier is a wide bandwidth amplifier with a differential
input. The current sense amplifier has two outputs, PWM
Output and I AVG Output. The PWM Output is the
instantaneous switch current which is filtered by the internal
leading edge blanking (LEB) circuitry prior to applying it to
the PWM Comparator non inverting input. The second
output is a filtered current signal resembling the average
value of the input current. Figure 54 shows the internal
architecture of the current sense amplifier.
A voltage proportional to the main switch current is
applied to the current sense input, IS POS . The current sense
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