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