HA16178P Datasheet, PDF (12/25 Pages) Renesas Technology Corp – Power Factor Correction Controller IC

HA16178P/FP
Description of Pin Functions
OUT Pin:
The power MOS FET gate-drive signal is output from this pin, and takes the form of a rectangular waveform with an
amplitude of VCC-GND.
PGND Pin:
The ground terminal for OUT driver.
SGND Pin:
The ground terminal for internal circuits.
PFC-ON Pin:
This pin is applied smoothing voltage of rectified AC voltage. When 1.75 V (typ.) or more is applied to this pin, PFC
operation starts. When the voltage is 1.6 V (typ.) or lower, the PFC operation stops.
VREF Pin:
Temperature-compensated voltage with an accuracy of 5 V ± 3% is output from this pin. The pin should supply no
more than 5 mA (max.) source current. This pin has no sink capabilities.
CAO Pin:
This pin is the current-error amplifier output, and is connected to the phase-compensation circuit of the current-error
amp. The result of comparison of the voltage on this pin and the CT pin produces the pulse output from the OUT pin.
CS Pin:
Current detection pin. The current is controlled to be proportional to the AC voltage and the power factor is corrected.
When the voltage on this pin drops to –0.3 V (typ.) or below, over current detection circuit operates, and OUT pin is
stopped.
RT Pin:
A pin for frequency adjustment of the oscillator.
CT Pin:
A pin for frequency adjustment of the oscillator.
IAC Pin:
This pin is for detecting the input AC voltage waveform. For processing within the IC, the AC voltage waveform is
converted to current information.
FB Pin:
This pin is the input to the voltage error amp. This pin is applied to voltage divided PFC output with resistors. The
feedback loop is intended to keep 2.5 V (typ.).
EO Pin:
This pin is the output of the voltage error amp. This pin is connected to the phase-compensation circuit of the voltage
error amp. The voltage on this pin is the input signal to the internal multiplier.
SS Pin:
This pin is connected to GND or VREF via a capacitor. This pin is pulled up to the VREF pin voltage until PFC
operation starts. When the voltage on the PFC-ON pin has reached 1.75 V (typ.) PFC operation is start and this pin
flows 25 µA source current. Operation of the CAO pin is affected by that of the SS pin, the pulse width of the OUT pin
is limited, and this prevents overshooting when start up.
VCC Pin:
IC power-supply pin. The IC starts up at 10.5 V (typ.), and stops at 9 V (typ.).
REJ03D0903-0100 Rev.1.00 Jun 12, 2007
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