Applications
• PC
• Printer
• LCD TV
• Video game consoles
• High-power adapters
• Industrial and appliance high-power adapters
Description
The HiperTFS device family members incorporate both a
high-power two-switch-forward converter and a mid-power
flyback (standby) converter into a single, low-profile eSIP™
power package. The single chip solution provides the controllers
for the two-switch-forward and flyback converters, high- and
low-side drivers, all three of the high-voltage power MOSFETs,
and eliminates the converter’s need for costly external pulse
transformers. The device is ideal for high power applications
that require both a main power converter (two-switch forward)
up to 414 W, and standby converter (flyback) up to 20 W.
HiperTFS includes Power Integrations’ standard set of comprehensive
protection features, such as integrated soft-start, fault and
over-load protection, and hysteretic thermal shutdown.
HiperTFS utilizes advanced power packaging technology that
simplifies the complexity of two-switch forward layout, mounting
and thermal management, while providing very high power
capabilities in a single compact package. The devices operate
over a wide input voltage range, and can be used following a
power-factor correction stage such as HiperPFS.
Two-switch-forward power converters are often selected for
applications demanding cost-effective efficiency, fast transient
response, and accurate tolerance to line voltage fluctuation. The
two-switch-forward controller incorporated into HiperTFS
devices improves on the classic topology by allowing operation
considerably above 60% duty cycle. This improvement reduces
RMS currents conduction losses, minimizes the size and cost of
the bulk capacitor, and minimizes output diode voltage ratings.
The advanced design also includes transformer flux reset
control (saturation protection) and charge-recovery switching of
the high-side MOSFET, which reduces switching losses. This
combination of innovations yields an extremely efficient power
supply with smaller MOSFETs, fewer passives and discrete
components, and a lower-cost transformer.
HiperTFS’s flyback standby controller and MOSFET solution is
based on the highly popular TinySwitch™ technology used in
billions of power converter ICs due to its simplicity of operation,
light load efficiency, and rugged, reliable, performance. This
flyback converter can provide up to 20 W of output power and
the built in overload power compensation reduces component
design margin