TFS757 datasheet(3/36 Pages) POWERINT

3 / 36 page

Rev. E 04/15

TFS757-764HG

www.power.com

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 comprehen-

sive 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.

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 current limit (main and standby)

•

Fully integrated soft-start for minimum start-up stress

•

Simple fast AC reset

•

Reduced EMI

•

Synchronized 66 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

•

Transformer reset control

•

Prevents transformer saturation under all conditions

•

Extends duty cycle to satisfy AC cycle drop out ride through

•

Duty cycle soft-start with 115% current limit boost

•

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

output

•

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, or 20 W)

•

Built-in overload power compensation

•

Flat overload power vs. input voltage

•

Reduces component stress during overload conditions

•

Reduces required design margin for transformer and output

diode

•

Output overvoltage (OV) protection with fast AC reset

•

Latching, non-latching, or auto-restart

•

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

•

Output over-current protection (OCP)

Advanced Package for High Power Applications

•

434 W output power capability in a highly compact package

•

Up to 550 W peak

•

Simple clip mounting to heat sink

•

Can be directly connected to heat sink without insulation pad

•

Provides thermal impedance equivalent to a TO-220

•

Heat slug connected to ground potential for low EMI

•

Staggered pin arrangement for simple routing of board traces

and high-voltage creepage requirements

•

Single power package for two power converters reduces

assembly costs layout size

TFS757 Datasheet(PDF) 3 Page - Power Integrations, Inc.

TFS757 Datasheet(HTML) 3 Page - Power Integrations, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

Datasheet Download

Link URL