TFS7706H datasheet(4/42 Pages) POWERINT

4 / 42 page

Rev. B 04/15

TFS7701-7708

www.power.com

Table 2.

Summary of Differences Between HiperTFS-2 and Other Typical High Power Supplies.

Function

Typical Two-Switch

Forward

HiperTFS-2

Advantages of HiperTFS-2

Nominal Duty Cycle

33%

45%

Wider duty cycle reduces RMS switch currents by 17%.

Reduces R

DS(ON) losses by 31%

Maximum Duty Cycle

<50%

63%

Switch Current (RMS)

100%

83%

Output Catch Diode

Voltage Rating

100%

79%

Lower losses. Wider D

MAX lowers catch diode rating by

O + VD/DMAX reduction in catch diode voltage rating

Clamp Voltage

Reset diodes from zero

to V

Reset from zero to

IN + 130 V)

With fast/slow diode combination, allows charge

recovery to limit high-side MOSFET C

OSS loss

Thermal Shutdown

---

118 °C Shutdown /

55 °C Hysteresis

HiperTFS-2 provides integrated OTP device protection

Current Sense Resistor

0.5 V drop

(0.33

W at 300 W)

No sense resistor

Improved efficiency. MOSFET R

DS(ON) sense eliminates

need for sense resistor

High-Side Drive

Requires gate-drive

transformer (high-cost)

Built-in high-side drive

Lower cost; component elimination. Removes

high-cost gate-drive transformer (EE10 or toroid)

Component Count

Higher

Lower

Saves up to 30 components, depending on specification.

TinySwitch Overload Power

Compensation vs. Input Voltage

---

Built-in compensation

Safer design; easier to design power supply. Flattens

standby overload output power versus line voltages

Package PC Board

Creepage

TO-220 = 1.17 mm

eSIP16/12 = 2.3 mm

HiperTFS-2 meets functional safety spacing at

package pins

Package Assembly

2 × TO-220 package,

2 × SIL (insulation),

1 main controller,

1 standby controller

1 Package

No SIL (insulation) pad required

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