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NCP1652, NCP1652A
ISpos pin multiplied by the current sense amplifier gain. It
is applied to the inverting input of the AC EA.
The AC EA is a transconductance amplifier. A
transconductance amplifier generates an output current
proportional to its differential input voltage. This amplifier
has a nominal gain of 100 m S (or 0.0001 A/V). That is, an
input voltage difference of 10 mV causes the output current
to change by 1.0 m A. The AC EA has typical source and sink
currents of 70 m A.
The filtered input current is a high frequency signal. A low
reference generator output. A pole-zero pair is created by
placing a (R COMP ) and capacitor (C COMP ) series
combination at the output of the AC EA. The AC COMP pin
provides access to the AC EA output.
The output of the AC EA is inverted and converted into a
current using a second transconductance amplifier. The
output of the inverting transconductance amplifier is
V ACEA(buffer). Figure 62 shows the circuit schematic of the
AC EA buffer. The AC EA buffer output current, I ACEA(out) ,
is given by Equation 1.
frequency pole forces the average input current to follow the
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 62. AC EA Buffer Amplifier
I ACEA(out) + @ 4
2.8 * V ACEA
(eq. 1)
37.33k
The voltage at the PWN non-inverting input is determined
by I ACEA(out) , the instantaneous switch current along and the
ramp compensation current. OUTA is terminated once the
voltage at the PWM non-inverting input reaches 4 V.
Current Sense Amplifier
A voltage proportional to the main switch current is
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 63 shows the internal
architecture of the current sense amplifier.
applied to the current sense input, IS POS . The current sense
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