Combined Two-Switch Forward and Flyback Power Supply Controllers with Integrated High-Voltage MOSFETs

Figure 1. Schematic of Two-Switch Forward and Flyback Converter.

Data Sheets

ECAD Models


Download symbol, footprint, and 3D models to speed your design process.
Find Models

Product Details


The HiperTFS-2 devices incorporate 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 a standby converter (flyback) up to 20 W. The devices operate over a wide input voltage range, and can be used following a power-factor correction stage such as HiperPFS.


New with HiperTFS-2

  • Improved assembly flow – changed from 3 row package to 2 row package
  • Up to 40% more peak power – easily meeting the next generation Intel CPU peak power requirement
  • Self biased high-side driver – eliminating bias winding
  • Main convertor now offers 66kHz/132kHz options


Product Highlights

Key Benefits

  • Single chip solution for two-switch forward main and flyback standby
  • High integration allows smaller form factor and higher power density designs, with reduced component count
  • Incorporates control, gate drivers, and three power MOSFETs
  • Level shift technology eliminates need for pulse transformer
  • Protection features include: UV, OV, OTP, OVP, standby OPC, SCP, and ILIMIT
  • Transformer reset control, prevents saturation under all conditions
  • Main duty cycle operation above 50% for reduced rms currents and lower output diode voltage rating
  • Less than 10% variation in standby overload power over input voltage range


  • PC (80 PLUS Bronze and 80 PLUS Silver)
  • Printer
  • LCD TV
  • Video game consoles
  • High power adaptors
  • Industrial & appliance


Power Table

Output Power Table
PRODUCT3 Two-Switched Forward
380 V
100 V - 400 V
(50 °C)
Peak2 50 °C
TFS7701H 148 W 187 W 20 W
TFS7702H 190 W 297 W 20 W
TFS7703H 229 W 375 W 20 W
TFS7704H 251 W 419 W 20 W
TFS7705H 269 W 466 W 20 W
TFS7706H 298 W 513 W 20 W
TFS7707H 322 W 553 W 20 W
TFS7708H 343 W 586 W 20 W

Table 1. Output Power Table.


  1. Maximum practical continuous power in an open frame design with adequate heat sinking to maintain a heat sink temperature ≤95 ºC measured at specified ambient temperature.
  2. Peak load less than 10 seconds and average power less than maximum continuous load.
  3. Package: H: eSIP-16F. (Note: Direct attach to heat sink, does not require insulation SIL pad).

Product Documents

Design Examples

Product Image