©2010. Renesas Electronics Corporation, All rights reserved.
Renesas Electronics URL http://www.renesas.com/pfcic
1. Continuous conduction mode suitable for the system with a large amount and frequency of a current change.
2. ON/OFF support of the main converter and the load by a PG signal and a hold function.
3. Hold function against an AC temporary blackout
4. Over-voltage protection with a feedback loop absence detecting function
5. Quick soft-start
6. Improvement of the load regulation by a Gm amplifier
Single-function PFC control IC
380V
PFC unit
100/200V
Gain
selector
Hold function against
AC temporary blackout
Over-voltage protection
with feedback loop absence
detecting function
P.G circuit &
ON/Off timing adjustment
Soft start circuit
OVP
380V
HA16174
PFC unit
P.G circuit with
ON/Off timing
adjustment function
Soft start
100/200V
Gain selector
Hold function against
AC temporary blackout
High reliability by all required functions integrating
OUT
GND
DELEY
PGADJ
PFC-ON
VREF
CAO
CS
VCC
SS
EO
FB
IAC
PG
CT
RT
DIP16
or
SOP16
• Small radiation noise
• Small peak current
• Strong to
current change
• Relatively-simple
circuit
•Some complicated
circuit
• Large choke coil
at high current area.
• Large peak current
• Indefinite frequency
Advantages
Weak points
Input voltage
Choke coil current
Input average current
(1) Continuous conduction
(2) Critical conduction
In case of critical current
mode, the peak current
changing so large.
In case of continuous
current mode, peak current
not so much changing.
In case of lout change
Large current change
PG signal
Ex.) Enable to start or stop the main converter in the normal sequence by using a PG signal.
AC input
Hold counter
Bulk voltage
PG off voltage (Adjustable)
AC input
Bulk voltage
Hold counter
Hold timer (Adjustable)
The hold function achieves fast recovery since IC operation does not
stop until a specified time even in case of bad power condition.
AC
blackout
Gate output
(HA16174)
FET OUT
(Conventional IC)
FB
Bulk voltage
Feedback loop absence detection can stop output pulse.
Therefore Renesas PFC IC prevents the breakings of bulk capacitor and MOSFET.
FB Conventional IC
w/o this function
Bulk voltage
The feedback loop is
down case, bulk
voltage is going up
abnormal voltage.
Then capacitor is
broken.
HA16174
Detect the feedback
loop disconnection, and
stop the pulse!
Prevent from the breakings of
bulk capacitance and power
MOS!!
HA16174
Conventional IC
cut
cut
Amp. for FB
VREF
R2
R1
VOUT
VEO
Amp. for FB
FB
VREF
R2
R1
VOUT
In case of gmAMP, there is no affection
of feedback current flow, and load
regulation becomes good.
Conventional IC
HA16174
1. Continuous Conduction Mode
2. ON/OFF Support for Main Converter and Load
3. Hold function against AC Temporary Blackout
4. Over-voltage Protection
with a Feedback Loop Absence Detecting Function
6. Improvement of Load Regulation by gm Amp.
in Feedback Loop
5. Quick Soft Start Shortens S/S time
Triangle waveform
Soft start
Popular soft start time
Renesas
Css=4.7uF
Shortened time=4.7uFX1V/25uA=188ms.
Renesas PFC Control IC for Digital-TV
HA16174
Features
Small and high reliability system
12V
380V
1.2V
+
RJK5015
HA16163
HA16167
P.G signal
Example of Application Circuit
April 2010
•The HA16174 stabilizes the over-current control of PFC unit and sets the
S/S ineffective time by a hold function in time of an AC temporary blackout.
•The HA16163 makes up a full bridge and achieves small and high
efficiency trances.
Stop the PG signal, when
a bulk voltage drops to
less than setting voltage
(Vth).
HA16174
S/S: Soft start
Gate output
Output the PG signal at the setting time
by a hold counter late to stabilize after
the bulk voltage reaches the provision.
Over-voltage protection
with feedback loop absence
detecting function
Current type of circuit suffers an affection
of the feedback current flow because R1,
R2 impedance is not ideal.
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
