7708 datasheet(3/42 Pages) POWERINT

3 / 42 page

Rev. B 04/15

TFS7701-7708

www.power.com

Description

The HiperTFS-2 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 586 W peak, and standby converter (flyback) up to 20 W.

HiperTFS-2 includes Power Integrations’ standard set of

comprehensive protection features, such as integrated soft-

start, fault and overload protection, and hysteretic thermal

shutdown. HiperTFS-2 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 converters that have high

efficiency, fast transient response, and high rejection to line

voltage variation. The two-switch-forward controller

incorporated into HiperTFS-2 devices improves on the classic

topology by allowing operation considerably above 50% duty

cycle. This improvement reduces RMS current 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 smaller transformer.

HiperTFS-2’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.

Product Highlights

Protected Two-Switch Forward and Flyback

Combination Solution

•

Incorporates three high-voltage power MOSFETs, main and

standby controllers, and gate drivers

•

Level shift technology eliminates need for pulse transformer

•

Programmable line undervoltage (UV) detection prevents

turn-off glitches

•

Programmable line overvoltage (OV) detection; latching and

non-latching

•

Accurate hysteretic thermal shutdown (OTP)

•

Accurate selectable cycle-by-cycle current limit (main and

standby)

•

Line compensated standby MOSFET current limit for

standby over power compensation (OPC)

•

Fully integrated soft-start to minimize start-up stress

•

Simple fast AC reset

•

Reduced EMI

•

Synchronized 66/132 kHz forward and 132 kHz flyback

converters

•

Frequency jitter

•

Eliminates up to 30 discrete components for higher reliability

and lower cost

Asymmetrical Two-Switch Forward Reduces Losses

•

Allows >50% duty cycle operation

•

Reduces primary-side RMS currents and conduction losses

•

Minimizes the size and cost of the bulk capacitor

•

Allows reduced capacitance or longer hold-up time

•

Allows lower voltage output diodes for higher efficiency

•

Transformer reset control

•

Prevents transformer saturation under all conditions

•

Extends duty cycle to satisfy AC cycle drop out ride through

•

Duty cycle soft-start

•

Satisfies 2 ms ~ 20 ms start-up with large capacitance at

output

•

Self-biased high-side driver eliminates high-side bias winding

(66 kHz)

•

Remote-on/off function

•

Voltage-mode controller with current limit

20 W Flyback with Selectable Power Limit

•

TinySwitch-III based converter

•

Selectable power limit (10 W, 12.5 W, 15 W, 20 W)

•

Built-in overload power compensation (OPC)

•

Flat overload power vs. input voltage

•

Reduces component stress during overload conditions

•

Reduces required design margin for transformer and output

diode

•

Output overvoltage (OVP) protection with fast AC reset

•

Latching, non-latching, or auto-restart

•

Output short-circuit protection (SCP) with auto-restart

Advanced Package for High Power Applications

•

Up to 586 W peak output power capability in a highly

compact package

•

Simple clip mounting to heat sink

•

Can be directly connected to heat sink without insulation pad

•

Provides lower thermal resistance than a TO-220

•

Heat slug connected to ground potential for low EMI

•

Two row lead form for easy insertion into PC-board

•

Single power package for two power converters reduces

assembly costs and layout size

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