PLC810PG
HiperPLC
™
Family
Continuous Mode PFC & LLC Controller
with Integrated Half-bridge Drivers
Product Highlights
Features
•
Highly integrated, eliminates external components
•
Frequency and phase synchronized PFC and LLC
•
Reduced noise and EMI
•
Ripple current reduction in PFC output capacitor
•
Edge collision-avoidance simplifies layout
•
Comprehensive PFC and LLC fault handling and current limiting
•
Proprietary continuous conduction mode PFC for high
efficiency with low component cost
•
High efficiency Zero Voltage Switching (ZVS) LLC
•
Off-time PFC control eliminates AC input sensing components
•
Configurable, precise dead time control and frequency limit
•
Prevents hard MOSFET switching
•
Tight LLC duty cycle symmetry for balanced O/P diode currents
•
Lead and halogen free Green package
Applications
•
32” to 60” LCD TV power supplies
•
Off-line 150 W to 600 W efficiency-optimized power supplies
•
LED street lighting
Description
The PLC810PG is a combined PFC and LLC off-line controller
with integrated high voltage half-bridge drivers. Figure 1 shows
a simplified schematic of a PLC810PG based power supply
where the LLC resonant inductor is integrated into the
transformer. The PFC section of the PLC810PG is a universal
input continuous current mode (CCM) design that does not
require a sinusoidal input reference, thereby reducing system
cost and external components.
The DC-DC controller drives an LLC resonant topology. This
variable frequency controller provides high efficiency by
switching the power MOSFETs at zero voltage, eliminating most
switching losses. The LLC controller is built around a current
controlled oscillator with a control range selected to support
the traditional frequency of operation found in televisions.
To ensure zero voltage switching, the dead time of the LLC
switching in the PLC810PG is tightly toleranced and can be
adjusted with an external resistor. The highside/lowside duty
cycle is also closely matched to provide balanced output
currents reducing output diode cost.
A typical PLC810PG LLC design operates at 100 kHz (under
nominal conditions). Depending on the LLC circuit design, the
switching frequency can vary from half to three times the nominal
operating frequency as a result of line and load changes.
The PFC converter is frequency locked to the LLC to minimize
noise and electromagnetic interference. Increasing the PFC
frequency in synchronization with the LLC at light loads
reduces the current at which the PFC boost converter
Standby
Supply
AC
IN
VCCHB
GATEH
HB
VCCL
VCC
ISP
FBP
PFC Gate
Driver
GATEP
GATEL
ISL
VREF
+
DC
OUT
PLC810PG
VCOMP
FMAX
FBL
LLC Feedback Circuit
GNDP
GND
Link
Figure 1.
Typical Application Circuit – LCD TV Power Supply.
August 2009
GNDL
PI-5044a-121708
www.powerint.com
POWERINT [ POWER INTEGRATIONS, INC. ]
