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

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Figure 1. Simplified Schematic of Two-Switch Forward and Flyback Converters

Data Sheets

Product Details

Product Discontinuation Information

Production of HiperTFSwill end after June 10, 2020. Please contact your local PI sales office for smales to help migration to the replacement products.

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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.

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
    • Incorporates control, gate drive, and three HV power MOSFETs
    • Level shift technology eliminates need for pulse transformer
    • Protection features include: UV, OV, OTP, OCP, & SCP
  • Transformer reset control
    • Prevents transformer saturation under all conditions
  • Allows >50% duty cycle operation
    • Reduces primary side RMS currents & conduction losses
  • Standby supply provides built-in overload power compensation
  • Up to 434 W total output power in a highly compact package
    • Up to 550 W peak
    • High efficiency solution easily enables design to meet stringent efficiency specifications.
    • >90% efficiency at full load
    • No-load regulation and low losses at light-load
  • Simple clip mounting to heat sink without need for insulation pad
  • Halogen free and RoHS compliant


  • PC
  • Printer
  • LCD TV
  • Video game consoles
  • High power adaptors
  • Industrial & appliance


Power Table

Output Power Table1
PRODUCT2 Two-Switched Forward
380 V
100 V - 400 V
(25 °C)
(50 °C)
(50 °C)
50 °C
TFS757HG 193 W 163 W 228 W 20 W
TFS758HG 236 W 200 W 278 W 20 W
TFS759HG 280 W 235 W 309 W 20 W
TFS760HG 305 W 258 W 358 W 20 W
TFS761HG 326 W 276 W 383 W 20 W
TFS762HG 360 W 304 W 407 W 20 W
TFS763HG 388 W 327 W 455 W 20 W
TFS764HG 414 W 344 W 530 W 20 W

Table 1. Output Power Table.


  1. Maximum practical continuous power in an open frame design with adequate heat sinking (assuming heat sink ΘC-A of <4 °C/W), measured at specified ambient temperature (see Key Applications Considerations for more information).
  2. Package: H: eSIP16/12. (Note: Direct attach to heat sink, does not require insulation SIL pad)

Product Documents

Design Examples

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