PFS704 Datasheet, PDF (3/30 Pages) Power Integrations, Inc. – High Power PFC Controller with Integrated High-Voltage MOSFET

PFS704-729EG
Description
The HiperPFS device family members incorporate a continuous
conduction mode (CCM) boost PFC controller, gate driver, and
high voltage power MOSFET in a single, low-profile eSIP™
power package that is able to provide near unity input power
factor. The HiperPFS devices eliminate the PFC converter’s
need for external current sense resistors, the power loss
associated with those components, and leverages an innovative
control technique that adjusts the switching frequency over
output load, input line voltage, and even input line cycle. This
control technique is designed to maximize efficiency over the
entire load range of the converter, particularly at light loads.
Additionally, this control technique significantly minimizes the
EMI filtering requirements due to its wide-bandwidth spread
spectrum effect. HiperPFS includes Power Integrations’
standard set of comprehensive protection features, such as
integrated soft-start, UV, OV, brown-in/out, and hysteretic thermal
shutdown. HiperPFS also provides cycle-by-cycle current limit
for the power MOSFET, power limiting of the output for over-
load protection, and pin-to-pin short-circuit protection.
HiperPFS’s innovative variable-frequency continuous conduction
mode of operation (VF-CCM) minimizes switching losses by
maintaining a low average switching frequency, while also
varying the switching frequency in order to suppress EMI, the
traditional challenge with continuous-conduction-mode
solutions. Systems using HiperPFS typically reduce the total X
and Y capacitance requirements of the converter, the inductance
of both the boost choke and EMI noise suppression chokes,
reducing overall system size and cost. Additionally, compared
with designs that use discrete MOSFETs and controllers,
HiperPFS devices dramatically reduce component count and
board footprint while simplifying system design and enhancing
reliability. The innovative variable-frequency, continuous
conduction mode controller enables the HiperPFS to realize all
of the benefits of continuous-conduction mode operation while
leveraging low-cost, small, simple EMI filters.
Many regions mandate high power factor for many electronic
products with high power requirements. These rules are
combined with numerous application-specific standards that
require high power supply efficiency across the entire load
range, from full load to as low as 10% load. High efficiency at
light load is a challenge for traditional PFC approaches in which
fixed MOSFET switching frequencies cause fixed switching
losses on each cycle, even at light loads. HiperPFS simplifies
compliance with new and emerging energy-efficiency standards
over a broad market space in applications such as PCs, LCD
TVs, notebooks, appliances, pumps, motors, fans, printers, and
LED lighting.
HiperPFS advanced power packaging technology and high
efficiency simplifies the complexity of mounting the package
and thermal management, while providing very high power
capabilities in a single compact package; these devices are
suitable for PFC applications from 75 W to 1 kW
Product Highlights
Protected Power Factor Correction Solution
• Incorporates high-voltage power MOSFET, controller, and gate
driver
• EN61000-3-2 Class D compliance
• Integrated protection features reduce external component count
• Accurate built-in brown-in/out protection
• Accurate built-in undervoltage (UV) protection
• Accurate built-in overvoltage (OV) protection
• Hysteretic thermal shutdown (OTP)
• Internal power limiting function for overload protection
• Cycle-by-cycle power switch current limit
• No external current sense required
• Provides “lossless” internal sensing via sense-FET
• Reduces component count and system losses
• Minimizes high current gate drive loop area
• Minimizes output overshoot and stresses during start-up
• Integrated power limit and frequency soft start
• Improve dynamic response
• Input line feed-forward gain adjustment for constant loop
gain across entire input voltage range
• Eliminates up to 40 discrete components for higher reliability
and lower cost
Intelligent Solution for High Efficiency and Low EMI
• Continuous conduction mode PFC uses novel constant volt/
amp-second control engine
• High efficiency across load using a UF boost diode
• Low cost EMI filter
• Universal input device (PFS704 – PFS716) utilize frequency
sliding technique for light load efficiency improvements
• >95% efficiency from 10% load to full load at low line input
voltage
• >96% efficiency from 10% load to full load at high line input
voltage
• High line input device (PFS723 – PFS729) maintain higher
average switching frequency to minimize boost inductance
and core size
• >94% efficiency from 10% load to full load
• Variable switching frequency to simplify EMI filter design
• Varies over line input voltage to maximize efficiency and
minimize EMI filter requirements
• Varies with input line cycle voltage by >60 kHz to maximize
spread spectrum effect
Advanced Package for High Power Applications
• Up to 1 kW peak output power capability in a highly compact
package
• Simple clip mounting to heat sink
• Can be directly connected to heat sink with insulation pad
• Provides thermal impedance equivalent to a TO-220
• Staggered pin arrangement for simple routing of board traces
and high voltage creepage requirements
• Single package solution for PFC converter reduces assembly
costs and layout size
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Rev. D 12/11