HA16174 Просмотр технического описания (PDF) - Renesas Electronics
Номер в каталоге
Компоненты Описание
производитель
HA16174 Datasheet PDF : 1 Pages
| |||
Renesas PFC Control IC for Digital-TV
HA16174
April 2010
Features
OUT
High reliability by all required functions integrating
GND
1. Continuous conduction mode suitable for the system with a large amount and frequency of a current change. DELEY
2. ON/OFF support of the main converter and the load by a PG signal and a hold function.
PGADJ
3. Hold function against an AC temporary blackout
PFC-ON
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
VREF
CAO
CS
VCC
DIP16
SS
EO
or
FB
IAC
SOP16 PG
CT
RT
Single-function PFC control IC
Example of Application Circuit
380V
Small and high reliability system
100/200V
Gain
selector
PFC unit
OVP
Over-voltage protection
with feedback loop absence
detecting function
•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
P.G circuit &
efficiency trances.
Hold function against
ON/Off timing adjustment
AC temporary blackout
Soft start circuit
380V
12V
HA16174
+
PFC unit
380V
Ga1i0n0s/2e0le0cVtowr iOthvfederee-vtdeobclattaicngkgelfopuornopctteaiocbntsioennce
Hold function against
AC temporary blackout P.G circuit with
Soft start
ON/Off timing
adjustment function
HA16174
HA16163
Gate output
RJK5015
P.G signal
HA16167
1.2V
1. Continuous Conduction Mode
2. ON/OFF Support for Main Converter and Load
Input average current
Input voltage
Choke coil current
(1) Continuous conduction
(2) Critical conduction
In case of lout change
Advantages
Weak points
• Small radiation noise •Some complicated
• Small peak current circuit
• Strong to
current change
• Relatively-simple
circuit
• Large choke coil
at high current area.
• Large peak current
• Indefinite frequency
AC input
Bulk voltage
PG off voltage (Adjustable)
Hold counter
PG signal
Stop the PG signal, when
a bulk voltage drops to
less than setting voltage
(Vth).
Output the PG signal at the setting time
by a hold counter late to stabilize after
the bulk voltage reaches the provision.
Ex.) Enable to start or stop the main converter in the normal sequence by using a PG signal.
In case of continuous
current mode, peak current
not so much changing.
In case of critical current
mode, the peak current
changing so large.
Large current change
3. Hold function against AC Temporary Blackout
AC
AC input
blackout
Hold counter
Bulk voltage
Hold timer (Adjustable)
4. Over-voltage Protection
with a Feedback Loop Absence Detecting Function
Feedback loop absence detection can stop output pulse.
Therefore Renesas PFC IC prevents the breakings of bulk capacitor and MOSFET.
Conventional IC
Bulk voltage
HA16174
Bulk voltage
cut
FB
The feedback loop is
down case, bulk
voltage is going up
abnormal voltage.
Then capacitor is
broken.
Conventional IC
w/o this function
cut
FB
Detect the feedback
loop disconnection, and
stop the pulse!
Prevent from the breakings of
bulk capacitance and power
MOS!!
HA16174
Gate output
(HA16174)
FET OUT
(Conventional IC)
The hold function achieves fast recovery since IC operation does not
stop until a specified time even in case of bad power condition.
6. Improvement of Load Regulation by gm Amp.
in Feedback Loop
Conventional IC
VOUT
VOUT
HA16174
5. Quick Soft Start Shortens S/S time
Soft start
Css=4.7uF
Shortened time=4.7uFX1V/25uA=188ms.
Triangle waveform Renesas
Popular soft start time
S/S: Soft start
Renesas Electronics URL http://www.renesas.com/pfcic
R2
Amp. for FB
R1
VEO
VREF
R2
FB Amp. for FB
R1
VREF
Current type of circuit suffers an affection In case of gmAMP, there is no affection
of the feedback current flow because R1, of feedback current flow, and load
R2 impedance is not ideal.
regulation becomes good.
©2010. Renesas Electronics Corporation, All rights reserved.
Share Link: 