Applications

? PC ? High-power adaptors

? Printer ? High-power LED lighting

? LCD TV ? Industrial and appliance

? Video game consoles ? Generic PFC converters

描述 Description

The HiperPFS?-2 device family members reach a very high level

of integration including a continuous conduction mode (CCM)

boost PFC controller, gate driver, ultra-low reverse recovery

(Qspeed) diode (eSIP? package options) and high-voltage

power MOSFET in a single, low-profile CoolPAD (GROUND pin

connected) power package that is able to provide near unity

input power factor. The HiperPFS-2 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. The HiperPFS-2 also features an integrated non-linear

amplifier for enhanced load transient response, a user

programmable power good (PG) signal as well as user selectable

power limit functionality. HiperPFS-2 includes Power Integrations’

standard set of comprehensive protection features, such as

integrated soft-start, UV, OV, brown-in/out, and hysteretic

thermal shutdown. HiperPFS-2 also provides cycle-by-cycle

current limit for the power MOSFET, power limiting of the output

for overload protection, and pin-to-pin short-circuit protection.

HiperPFS-2’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-2 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-2 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-2 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. Besides featuring relatively flat

efficiency across the load range, HiperPFS-2 also enables higher

power factor at light loads. HiperPFS-2 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-2 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 425 W.