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NCL30001
Peak Charger
V IN
HV
DRV
V OUT
NCL30001
Figure 52. Peak charger
The startup circuit is rated at a maximum voltage of 500 V.
Power dissipation should be controlled to avoid exceeding
the maximum power dissipation of the controller. If
dissipation on the controller is excessive, a resistor can be
placed in series with the HV pin. This will reduce power
dissipation on the controller and transfer it to the series
resistor.
Drive Output
DRV has a source resistance of 10.8 W (typical) and a sink
resistance of 8.0 W (typical). The driver is enabled once V CC
reaches V CC(on) and there are no faults present. They are
disabled once V CC discharges to V CC(off) . The high current
drive capability of DRV may generate voltage spikes during
switch transitions due to parasitic board inductance.
Shortening the connection length between the driver and the
load and using wider connections will reduce
inductance ? induced spikes.
AC Error Amplifier and Buffer
The AC error amplifier (EA) shapes the input current into
a high quality sine wave by forcing the filtered input current
to follow the output of the reference generator. The output
of the reference generator is a full wave rectified ac signal
and it is applied to the non inverting input of the EA. The
filtered input current, I in , is the current sense signal at the
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
frequency pole forces the average input current to follow the
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 53 shows the circuit schematic of the
AC EA buffer. The AC EA buffer output current, I ACEA(out) ,
is given by Equation 1.
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